---[]-- -----------------.
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-- ----==-=�=®

©CopyrightInternational Business
Machines Corporation 1995.
AJI Rights Reserved.

---.:...
---- --------- ----- -

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·-

Hardware Maintenance
Service and Reference

Printed in the United States of America
References in thispublication to IBM
products or services do not
imply that IBM intends
to make them available
outside the United States.

30H2383rllI

I111111 t

S30H-2383-00

P30H2383

�

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---- ---- -·-------

Thinldad
Power Series 850--�---------.:l......____ -First Edition (July 1995)
The following paragraph does not apply to the United
Kingdom or any country where such provisions areinconsistent with local law: INTERNATIONAL BUSINESSMACHINES CORPORATION PROVIDES THIS
PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY

KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT
NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULARPURPOSE. Some states do not allow disclaimer or express orft

implied warranties in certain transactions; therefore, thisstatement may not apply to you.
This publication could include technical inaccuracies or
typographical errors. Changes are periodically made to theinformation herein; these changes will be incorporated in new
editions of the publication. IBM may make improvements orchanges in the products or the programs described in thispublication at any time.
It is possible that this publication may contain reference to, or
information about, IBM products (machines and programs),
programming, or services that are not announced in your country.
Such references or information must not be construed to meanthat IBM intends to announce such ffiM products, programming,or services in your country.
Requests for technical information about IBM products should bemade to your IBM Authorized Dealer or your ffiM Marketing
Representative.
IBM may have patents or pending patent applications covering
subject matter in this document. The furnishing of thisdocument does not give you any license to these patents. You
can send license inquiries, in writing, to the IBM Director ofLicensing, ffiM Corporation, 500 Columbus Avenue,
Thornwood, NY 10594, U.S.A.

© Copyright International Business Machines Corporation

1995. All rights reserved.
Note to U.S. Government Users - Documentation related torestricted rights - Use, duplication or disclosure is subject torestrictions set forth in GSA ADP Schedule Contract with ffiM
Corp.

Safety Information

Contents

The following inspection guide will assist you in identifying

ThinkPad Power Series 850 Hardware Maintenance1Service. . . . . . . . . . . . . . .
2How to Disable the Power-On Password
2
Supervisor Password
3
Power Shutdown Switch
4
General Checkout
10
Undetermined Problems
10
Installed Devices Chtck
11
Printer
12Power Systems Checkout
14
AC Adapter Test . . . .
15
Battery Pack Test
17
System Power Problems
18
Standby Battery Test
19
Backup Battery Test
20
Quick Charger Test
21
Maintenance Utility
22
System Information
23
SCSI Format
24
Numeric Error Codes
27
Symptom-to-FRU Index
27
No-Beep Symptoms
27
Beep Symptoms
28
Miscellaneous Symptoms
30
Parts Listing
31
FRU List34
Option List
35
Accessories;x>tentially unsafe conditions on IBM products. Each product, as:: "as designed and built, had required safety items installed toprotect users and service personnel from injury. This guide.;.ddresses only those items. However, good judgment should be
etsed to identify potential safety hazards due to attachment of
r:on-IBM features or options not covered by this inspectiong�ide.

r:· unsafe conditions are present, determine how serious the'iJ.Zard is, and whether you can continue without first correcting:.'ie problem.
Consider these conditions and the safety hazards they present:
Electrical hazards, especially primary power:

primary'oltage on the frame can cause serious or fatal electricalshock.
Explosive hazards, such as a capacitor, can cause serious
injury.
•'.lechanical hazards, such as loose or missing hardware, can.:ause serious injury.

"Ge guide consists of a series of steps presented in a checklist.
Bei=Jn the checks with the power off and the power cord
�==-'o' e d from the electrical outlet.

CY..:klist:
Power off the computer.

Disconnect the power cord fromthe electrical outlet.
'

Check exterior covers for damage (loose, broken, or sharp_

Check the power cord:edges).
a.

There should be a third-wire ground connector, and it
should be in good condition.

Use a meter to measurethird-wire ground continuity for 0.1 ohm or lessbetween the external ground pin and frame ground.

b. The cord should be the appropriate molded type as
specified in the parts section of this manual.
•.

�

The insulation must not be frayed or worn.

Remove the cover.

Check for any obvious non-IBM alterations. Use good
JUdgment as to the safety of any non-IBM alterations.

�

Check inside the unit for any obvious unsafe conditions.
su;:h as metal filings, contamination, water or other liquids.
.x signs of fire or smoke damage.

-C'Jeck for worn, frayed, or pinched cables.
C�eck that the power card shield has not been removed or:.impered with.

Cre;:k that all safety labels and information labels are.;.:wched correctly.

iT

ThinkPad Power Series 850

ThinkPad Power Series 850 Hardware
Maintenance Reference
Product Overview
Product Description
Options . . . . . .
Option Compatibility
Accessories
Component Descriptions
System Board
Microprocessor
Flash ROM
RT/CMOS/NVRAM
EEPROM
Power Management System. . . .. . . . . . .
LCD© Copyright IBM Corp. 1995

37
37
38
39
39
39
39
39
39
39
39
40
40
40

v

IC Card Controller
Diskette-Drive Controller
Serial Port
Parallel Port . . . . . .
External Input-Device Connector
External Display Connector
Operating Requirements
Power-On Self-Test (POST)
Memory Requirements and Limitations
Specifications
SystemAC Adapter
Quick Charger
Special Tools
Repair Information
Removals and Replacements
1000 Opening the Display Assembly1005 Camera Assembly, Middle Cover, Camera
Plate. . . .. . . . . . . . . . . . .
1010 Center Cover Assembly, LED FPC
1 0 1 5 Hinge Cap, Display Assembly
LCD FRU Replacement Notice1020 Interposer Card
1025 Keyboard Assembly, Keyboard Latch
1030 Opening the Keyboard
1035 HDD Assembly
1040 FDD Assembly
1045 CD-ROM Drive Assembly
1050 Battery Pack, Door (Battery, ISA Bus)
1055 Backup Battery, Standby Battery, IC Card
1060 PCMCIA Door . . . . . . . . . . . . . .
1065 Speaker Assembly (Left), Sub-Audio Card,
Speaker Bracket (Left), Keyboard Catch (Left)
1070 Speaker Assembly (Right), Speaker Bracket(Right), Keyboard Catch (Right). . . . . .
1075 Shield Assembly, Microphone Assembly
1080 DC/DC Card, Video Card1085 Audio Card, Audio Cable
1090 Inner Structure Holder, Audio FPC
1095 Memory Card
1 100 System Board
1 105 CPU Card
Locations
Rear Side View
Front and Bottom View
Inside View
System Board Connectors

viThinkPad Power Series 850

40
40
41
41
41
41
42
42
42
43

Read This First
Before you go to the checkout guide, be sure to read this section.
Important Notes -------,•

Only certified trained personnel should service the•Be extremely careful during write operations suchcomputer.
as copying, saving, or formatting. Drives in thecomputer that you are servicing might have been43

rearranged or the drive startup sequence might have44

been altered. If you select an incorrect drive, data or

44

45
46
47
47

programs can be written over.
•machine and FRU part number are correct by referringto the part list.
•

48
49
50
50
53
54
55
56
57
58
59
60
62
63

Replace FRUs only for the correct model. Whenyou replace the FRU, make sure the model of the

FRUs should not be replaced because of a single,
unreproducible failure. Single failures can occur
from a variety of reasons that have nothing to do witha hardware defect-for example, cosmic radiation,
electrostatic discharge, or software errors. FRU
replacement should only be considered when arecurring problem exists. If this is suspected, clear theerror log and run the test again. Do not replace any
FRUs if log errors do not reappear.

•

Be careful not to replace a nondefective FRU.

•

Do not forget to return the original FRU if you find thesuspected or replaced FRU is not the cause of theoriginal problem or symptom.

How to Use Error Messages
Use the error codes displayed on the screen to diagnose failures.
If more than one error code is displayed, begin the diagnosis

64

65
66
67
68
69
70
72
73
73
74
76
78

with the first error code. The cause of the first error code canresult in false error codes being displayed. If no error code isdisplayed, see if the error symptom is listed in the"Symptom-to-FRU Index" on page 2 7.

How to Diagnose Multiple FRUs
When the adapter or device has more than one FRU, the error
code could be caused by a single FRU. Before replacing several
FRUs, try removing or exchanging each FRU, one by one in thedesignated sequence, to see if the symptoms change.

©Copyright IBM Corp. 1995

vii

What to Do FirstThe servicer must include the following in the parts exchange
form or part return form that is attached to the returned FRU.

1. Name and phone number of servicer.
2.

Date of service.

3. Date when part failed.
4. Date of purchase.
5. Failure symptoms, error codes appearing on display,and beep symptoms.

6.

Procedure index and page number in which failing
FRU was detected.

7. Failing FRU name and part number.
8. Machine type, model number, and serial number.
9. Customer's name and address.

If the following symptoms are present, they may indicate
damage caused by nonwarranted activity:
Missing parts may be a symptom of unauthorized
service or modification.
HDD spindles can become noisy if subjected toexcessive force or if they are dropped.

FRU Service Notice
Review these service notice b,efore replacing a FRU.

LCD FRU Replacement Notice
If missing or discolored dots appear on the LCD, carefully readthe following note to determine whether you should replace theBefore checking problems with the computer, determine whether

LCD or not.

or not the damage applies the warranty by referring to thefollowing:

Note for Warranty:

Important -------,
During the warranty period, the customer

may be responsible for repair costs if the computer

A small number of missing, discolored, or lighted dots (ondamage was caused by misuse, accident, modification,

all the time) is <;haracteristic of LCD technology, but

unsuitable physical or operating environment, or

excessive pixel problems can cause viewing concerns. The

improper maintenance by the customer. The following

LCD should be replaced if the number of dots satisfies

list provides some common items that are not covered

either of the following conditions:

under warranty and some symptoms that may indicate the

The number of missing, discolored, or colored dots insystem was subjected to stresses beyond normal use:

any colored background is 21 or more.

The following is not covered under warranty:
A cracked LCD panel caused by the application ofexcessive force or from being dropped.
Scratched (cosmetic) parts.
Cracked or broken plastic parts, broken latches, broken
pins or connectors if the damage was caused byexcessive force.
Damage caused by liquid spilled into the system.
Damage caused by the improper insertion of a
PCMCIA card or the installation of an incompatible
card.
Damage due to foreign material in the FDD.
Diskette drive damage caused by pressing the diskette
drive cover or inserting diskettes with multiple labels.
A bent or damage diskette eject button.
CD-ROM drive damage caused by the application ofexcessive force from being dropped.
A fuse blown from the attachment of a nonsupported
device.
Inability to use the computer because the password wasforgotten.

viii

ThinkPad Power Series 850

Read This Firstix

ThinkPad Power Series 850
Hardware Maintenance Service
bnponant --------,
If you are not familiar with the IBM* ThinkPad*
Power Series• 850 safety information, begin byreading "Safety Information" on page iv. Thencontinue with the service or reference sections of thismanual as required.

The service section of this manual provides the necessary
information for a trained service representative todiagnose a failure to the field-replaceable unit (FRU).
This section includes:•
Password overriding•
General checkout•
Undetermined problems•
Power systems checkout•
Various computer tests•
Symptom-to-FRU index•
FRU codes•
Parts listing• Trademark of the IBM Corporation.
x

ThinkPad Power Series 850©Copyright IBM Corp. 1995

1

How to Disable the Power-On
Password

Power Shutdown Switch
The power shutdown switch is located on the rear side of
the system unit. This switch forces the computer power
off when the power switch does not work because of asystem hang.

Do the following to disable the power-on password:

I. Power off the computer.
2. Open the LCD panel and keybo
ard

assembly. (See"1 000 Opening the Display Assembly" on page 47
and "1030 Opening the Keyboard"on page 55.)
3. Remove the FDD or CD-ROM
drive assembly. (See''1040 FDD Assembly" on page 57
or "1045
CD-ROM Drive Assembly" on page58.)
4. Identify and install a jumperon the J21 connector on
the system board.
5. Power on the computer.

�ote: Remove the jumper from the J2 1 connector after
you have finished the service action.
To enable the password again, select password on the
Easy-Setup screen; then enter the password.

Supervisor Password
The supervisor password is a security feature that is used
protect the system from unauthorized use. No
o\erriding is provided. Obtaining permission from thepassword owner to unlock the password is a prerequisite
for running diagnostic tests and performing service.
to2

ThinkPad Power Series 850
Hardware Maintenance Service

3General Checkout
The diagnostic tests are intended to test only IBM
products. Non-IBM products or modified options cangive false errors and invalid responses.

DDDDDDDD

Impormnt --------,
If more than one error code appears, diagnose thefirst error code first. The cause of the first error
code can cause additional false error codes to appear.
Multiple error codes may appear on the LCD during
the POST process.

Yes- Power off the computer and all external devices.
- Check that all cables and the power cord are correctly
connected.
- Make sure there are no diskettes in the diskette drive.
- Set all display controls to their middle positions.
- Power on all external devices.
- Power on the computer while holding down the Fl
key. Check for the following responses:•
The power on indicator lights.
•
One short beep sounds.
•
The Easy-Setup screen or Power-On Password
screen appears.

DID EITHER THE EASY-SETUP OR POWER-ON
PASSWORD SCREEN APPEAR?

Easy-Setup

Password

Press the Ctrl + E keys to display the Error Log
screen. Go to Step 004.

- If the Power-On Password screen appears, enter the
password or disable the power-on password. (See"How to Disable the Power-On Password" on page 2.)- Select Test on the Easy-Setup screen; then go to Step
007 on page 6.

I

004

1

WERE ANY ERRORS LOGGED?

X�
Video

StartUp'

01230123

Test

[I]
Exit

4

�

003

� � [!B. �
Config

No

OK

Yes

No

�

(Step 005 continues)

ThinkPad Power Series 850

Hardware Maintenance Service

5

(continued)005 (continued)- Press the Enter key to exit the error log andselect Test on the Easy-Setup screen; then go to
Step 007.

010 (continued)
DID EITHER THE SUPER TEST OR SUPERPASSWORD SCREEN APPEAR?

[£] � � � � �- Note all error codes on the screen; then clear the error
log. Go to "Numeric Error Codes" on page 24 andfind the error code; then follow the instructions. If the
problem remains, go to "Undetermined Problems" onpage 10.

1 oo1/

SystemMemoryL2 Cache

SerialAudio

PCCard-1

PCCard-2

FDD-1

� OOLJ [00 �006�

[Q] � �Test

DID THE TEST MENU APPEAR?

Select All

Loop Test

Parallel

Video

�
SCSI

�
Exit

�
DDDDDD DD

Super Test

Test

Exit

1
1 oos/Yes

No- Go to "Symptom-to-FRU Index" on page 27 andfind the error code or the symptom and follow
the instructions. If the problem remains, go to"Undetermined Problems" on page 10.

009
Press the Ctrl + A keys and select Super Test on the
Test screen; then go to Step 010.

Yes

No

�

- Go to "Symptom-to-FRU Index" on page 27 andfind the error code or the symptom and follow
the instructions. If the problem remains, go to"Undetermined Problems" on page 10.

- If the password screen appears, unlock the supervisor

password. (See "Supervisor Password" on page 2.)(Step 012 continues)

1 010 1
(Step 010 continues)

6

ThinkPad Power Series 850

Hardware Maintenance Service

7

(continued)

012(continued)
IS THE DISPLAYED ICON CORREC
T WITH THE
INSTALLED DEVICES ON THE SUPER TEST
SCREEN?

Note: The icons of the installed devic
es are displa
Yes

DID THE TESTS DETECT A FAILURE?
Note: If the test stops or hangs when the test is running,
replace the last device that was tested.
Yes,'016/yed.

No

j1o13/
014

No

The error was not detected by the test:•- Go to "Installed Devices Check" onpage 10.

•

Select Select All or the specific icon you want to test;
then select Test. Go to Step 015 on page 9. (Diagnostic
tests will run on all devices in which icons are displayed.)
The serial, parallel, and PC cards icons have the wrap test
option. When you run the wrap test, install the wrap plugon each connector and click the icon twice; then select
Test.

•

•

017

Check that the cables and connectors are notdamaged.
Reconnect all adapters, drives, and modules;
then test the system several times. A Loop
Test option is available for looping the tests.
To exit the loop test, press the Ctrl + C keys
between each test.
If no error is detected, go to"Symptom-to-FRU Index" on page 27. Find
the symptom and follow the instructions.
If any errqrs are detected, go to "Numeric
Error Codes" on page 24.

- Note the error codes shown on the screen. Go to"Numeric Error Codes" on page 24 and replace theappropriate FRU.
SerialSerialSerialThe FDD icon has a scratch diskette test option. Whenyou run the scratch diskette test, install the scratch
diskette into the FDD and click on the icon twice; thenselect Test.
The CD-ROM drive icon has a CD-ROM test option.
When you run the CD-ROM test, install a CD-ROM into
the drive and click on the icon twice; then select Test.
See "Special Tools" on page 45 for the tool information.
You can do the video camera test by clicking on thevideo test icon. When you run the video camera test, set
the camera toward your face. Make sure your face isdisplayed on the screen and no error is detected.

8

ThinkPad Power Series 850

Hardware Maintenance Service

9Undetermined Problems

Printer

Power off the computer.
Remove or disconnect any external device or cables.
Power on the computer and run the diagnostic tests.
If the symptom remains, repeat steps I, 2, and 3
until you find the failing adapter or device.
5. If all devices are disconnected and the symptom
remains, go to "Power Systems Checkout" onpage 12. If this does not resolve the problem,
replace the system board.
6. If an intermittent problem remains after replacementof the FRUs, consider external electrical noises that
can have an effect on the computer. Check that the
EMC contacts on the system board are not broken.
The contacts are fragile and can be easily damaged.

1 . Make sure the printer is correctly connected andpower is on.
2. Run the printer self-test, if available. If the printerself-test does not run correctly, the problem is in theprinter. Refer to the printer service manual.
3. Disconnect the printer cable.
4. Select Parallel on the Super Test screen and run theparallel test, if the printer is attached to the parallel
port. If the test detects an error, replace the systemboard. If the test runs error free, replace the printercable; then run the program to see if the error is
re-created. If the problem remains, replace thesystem board.

1.
2.
3.
4.

Installed Devices Check
If a device is installed but the icon does not appears on
the Test or Super Test screen, the device is defective.
Make sure that the device is connected correctly. If thesymptom remains, replace the device or the system board.

Parallel and Serial icons are always displayed on the
Test or Super Test screen. That is, these icons represent
adapters on the system board, not the external devices.

10

ThinkPad Power Series 850

Hardware Maintenance Service

11

Power Systems Checkout
C se the following procedure when you suspect acomputer power problem, for example:•
The computer does not power on.
•
The computer attempts to power on; then it shuts
down immediately.

Obtain from the user all information about the symptomsof the power failure. Before analyzing the powersystems, disconnect both the battery pack and the AC
Adapter from the computer; then reconnect them to thecomputer (see note on page 17).

0011

b007

(continued)
Go to "Battery Pack Test" on page 15.

8- Using the AC Adapter, do the Super Test from theEasy-Setup screen. Select Select AU to test all devices.
Go to Step 009.

1 oo91

DID THE TESTS RUN SUCCESSFULLY?
Yes NollolO I

DOES THE COMPUTER FAIL ONLY WHEN
l'SING THE AC ADAPTER?

Yes

No

�

Go to Step 004.

0031

- Go to "AC Adapter Test" on page 14 and do the test.

01

If any error code is displayed, go to "Numeric
Error Codes" on page 24.
If nothing is displayed, go to "Symptom-to- FRU
Index" on page 27 and replace the appropriate
FRU.

- Go to "System Power Problems" on page 1 7 and do
the open/short circuit test.

�

DOES THE COMPUTER FAIL ONLY WHEN
t·sr-JG THE BATTERY PACK?

Yes

No

�

- If the problem occurs both in AC Adapter
operation and in battery pack operation, go to"System Power Problems" on page 17.

�DOES THE BATTERY PACK POWER BECOMELOW QUICKLY?
No

Yes

07

�
(Step

continues)ll ThinkPad Power Series 850

Hardware Maintenance Service13•

AC Adapter Test
Do the following to analyze an AC Adapter problem.
I. Unplug the AC Adapter from the power outlet andthe computer.
2. Inspect the AC Adapter for any signs of overheating
or damage.
3. Inspect the AC Adapter power cord for cuts or
damage. Replace the power cord, if necessary.
4. Plug the power cord into the power outlet. Listen
for any sound that might indicate defective
operation.
5. Measure the output voltage at the AC Adapter plug
between pins I and 3.

••

If the voltage is correct, suspect a short circuit or a
failure in the computer. Go to "System Power
Problems" on page I7.
If the system does not start up when the system is
powered on with the battery pack removed and the
AC Adapter connected, and if you hear noise comingfrom the AC Adapter, suspect a short circuit in thecomputer. Go to the "System Power Problems" onpage I7.
If the system starts up with the battery pack installed
and the AC Adapter disconnected, replace the
DC/DC card and make sure that the system starts up
with the AC Adapter connected. If the system starts
up, the original DC/DC card was bad. If the systemstill does not start up, replace the AC Adapter andreinstall the original DC/DC card. Make sure thesystem starts up with the new AC Adapter and theoriginal DC/DC card.

Battery Pack Test
Note: When the battery power becomes low, thecomputer alerts you by sounding three short
beeps.

Pin

Voltage (V de)

Signal NameI

+ I7.8 to +2Ide output
VCCSEL# (VCCC
mode select signal)

2

3
4

•

•

•

14

I. Remove the battery pack from the computer.
2. Make sure that the storage switch D on the battery
pack is in the ON (I) position.
3. Measure the voltage between battery pack terminals+ and -.

de ground

RTN
COMMGND (Type-I)
Open (Type-2)

If the voltage is incorrect, but not 0, replace the AC
Adapter.
If the voltage is 0, check the power cord and thepower outlet.
If the power cord and power outlet are OK, replace
the AC Adapter.

ThinkPad Power Series 850

Note: The + terminal has a shutter on it to protect itfrom accidentally being shorted.

Hardware Maintenance Service

15

System Power Problems
Terminals

•

•

•

•

Description++9.6 ± 2.4 V de-

GroundT

ThermalCharge the battery pack with the power off charge
procedure.
If the voltage is not correct after the battery pack ischarged, replace it.
If the voltage is correct, suspect a short circuit or
failure in the computer. Go to the "System Power
Problems" on page 17.
If the system starts up with the AC Adapter
connected, the battery pack removed, and the voltageof the battery pack correct, replace the DC/DC cardand check if the system starts up with only thebattery pack installed. If the system starts up, theoriginal DC/DC card is failing; if the system still
does not start up with the good DC/DC and with theoriginal battery, replace the battery pack and confirm
the system starts up with the new battery and withthe original DC/DC card.

Do the following to check to see if the thermal protection
has tripped:
I. Measure the resistance between terminal (-) and (T).
2. The resistance should be from 2 kQ to 50 kQ. If
the measured resistance is not in this range, replace
the battery pack. If the resistance is between 2 kQ
to 5 kQ, the temperature of the battery pack is toohigh for the battery pack to be charged. Do not
charge the battery pack until its resistance is morethan 5.5 kQ.

Do the following to analyze a short or an open circuit in
the computer:
I. Disconnect both the battery pack and the AC
Adapter; then reconnect them (see note).
2. Disconnect and then reconnect all external devices
from the computer one by one and see if the same
symptom appears. If you find a problem with an
external device or its associated cables, follow themaintenance procedure for that device.

3. If the same symptom remains with no external
devices connected, the problem is in the computer.
Visually check the cables, wires, connecters, andcards for short circuits, open wires, or loose ordamaged wires. Also check to see if there are any
foreign metal material in the computer.
4. If the problem remains after you have done all of thepreceding, isolate the failure in the computer bychanging the FRUs one by one. The most probable
failing FRUs are the DC/DC card and the systemboard.
5. If the battery power becomes low immediately after
power on and no problems are found in other partsof the computer and all internal tests run without
detecting any errors, replace the battery pack.
Note: If the power protection mechanism works, theoutput voltage from the DC/DC card and the AC
Adapter continues to be blocked. To cancel themechanism, disconnect the battery pack and the
AC Adapter and then reconnect them.

Hardware Maintenance Service

16

ThinkPad Power Series 850

17

Standby Battery Test
This battery is used for suspend mode back up.
1. Remove the standby battery. (See " 1055 Backup
Battery, Standby Battery, IC Card" on page 60.)
2. Measure the battery voltage between the connector
pins as shown below.

Wire

Voltage (V de)

Red (+)+2.7 to +4.5

Black (-)

GroundIf the voltage is not correct, replace the standby battery.
Also check the voltage across the pins of the J20
connector for the standby battery with the AC Adapter
connected to the system and with the system powerswitch off. If the voltage is less than 4.5V, replace the
DC/DC card first. If the voltage is more than 4.5V, theoriginal DC/DC card was bad. If the voltage is still low,
replace the system board. If the battery voltage is correct
and the system is still in suspend mode, a short circuit ora failure in the system board is likely. Replace thesystem board.

18

ThinkPad Power Series 850

Backup Battery Test
1. Remove the backup battery. (See "1055 Backup
Battery, Standby Battery, IC Card" on page 60.)
2. Measure the battery voltage between the connector
pins as shown below.

Wire

Voltage (V de)

Red (+)+2.7 to +3.7

Black (-)

GroundIf the voltage is not correct, replace the backup battery.
If the voltage is correct, a short circuit or a failure in thesystem board has occurred. Replace the system board.

Hardware Maintenance Service

19Quick Charger Test
Do the following if you suspect a Quick Charger
problem.
1. Make sure that the battery storage switch is in the
ON (I) position. Verify that the battery voltage andthe resistance are within the range described in"Battery Pack Test" on page 15.
2. Connect the power cord to the Quick Charger.
Connect the power plug to the power outlet. The
power indicator should tum on. If the indicator does
not tum on, recheck the connections of the power
cord.
3. Install the battery pack. The charging indicator
should start blinking.
4. Within 3.0 hours, the battery pack should be fully
charged and the charging indicator should change
from a blinking state to on all the _time.

Maintenance Utility
The Maintenance Utility is part of Easy-Setup. It consistsof two items:••

System InfoSCSI Format

To start the Maintenance Utility, press the Ctrl + V keys
in the Super Test screen. The following screen appears:

Easy-Setup

System Info

MAINTENANcE UTILITYSCSI Format

If the charger does not work as just stated, replace the
Quick Charger.
For other functions and operations, refer to the Quick
Charger manual.

20

Exit

ThinkPad Power Series 850
Hardware Maintenance Servicel.

21

System Information

SCSI Format

Select System Info in the Maintenance Utility menu.
This screen shows the Firmware Part Number, Installed
Memory, and Serial Number of the system board.

Do the following to format the disk:

Whenever you replace the system board, specify the serial
number of the new system board on this screen.
If the layout of your keyboard for alphanumeric keys isdifferent from the layout on the following page, use thelayout on the following page when you type the new
system information.

Warning: Make sure the drive address for the disk to beformatted is correct. This procedure erases all
information on the disk.
1. Select SCSI Format on the Maintenance Utilitymenu.
2. Select the drive from the menu.
3. Follow the instructions on the screen.

ODJ
ODJ
ODJ
ODJ
ODJ
ODJ
OJ
OJ
OJ
OJ
OJ

22

ThinkPad Power Series 850

Hardware Maintenance Service

23

Numeric Error Codes

Symptom or Error

FRU and Action

0002 10YO

Memory error in slot Y(Memory error)

In the following error codes, X can be any number.

Note --------.
For IBM devices not supported by the ThinkPad
Power Series 850 diagnostic codes, refer to themanual for that device.

Y

Memory card
DIMM in upper slot

If an error is detected by the diagnostic test or POST, aneight-digit error code is displayed. The error code
indicates the suspected FRUs. The most likely cause islisted first.

2

DIMM in bottom slot

3

IC DRAM in slot I

4

IC DRAM in slot 2

5Either DIMM

6

Either IC DRAM

System board
000300XX

Keyboard assembly(Keyboard)

System board

00063XXO

Diskette drive(Diskette drive)

Media
System board

000640DO

No media found(Diskette drive)

Media is defective
Diskette drive

Symptom or Error

FRU and Action

00010000

CPU card(Processor)

System board

OOOI SOOX

System board(Flash)OOOISSOX

System board
0006XXXO

Diskette drive(Diskette drive)

System board

00110001

Disconnect any 1/0 device from

(Serial port)

the serial port.
System board

System board(Interrupt)

OOl l OOXXSystem board(Serial port)

0001600X

Backup battery connection(CMOS/NVRAM)(Disconnect and reconnect theconnector.)

00140006

Disconnect any 1/0 device from

(Parallel port)

the parallel port.
System board

Backup battery
System board

0014000X

000170XX

Backup battery(Parallel port)(NVRAMIEEPROM)

System board

00140010

Check the enhanced parallel port

0 002 0 000

Memory card

(Enhanced paralleland disconnect any 1/0 from it.

(Memory error)

System board

port)

System board

Memory card configuration error

00140011

System board

0002 00ZZ(Memory error)

ZZ Meaning
01 DIMM Card mismatch
02

Bottom DIMM slot is empty

03 Upper DIMM slot is empty
11 IC DRAM card mismatch
12 IC DRAM slot 2 is empty
13 IC DRAM slot 1 is empty

System board(Enhanced parallelport)
0024000X

Video card

(Video)System board

0037 XXXO

System board(SCSI controller)
00370730

Device ID conflict(SCSI controller)

Hardware Maintenance Service

24

ThinkPad Power Series 850

25Symptom or Error

FRU and Action

008 00004

PCMCIA wrap plug not installed.

(J>CMCIA)008 000 XX

System board

tPCMCIA)008 600XO

Keyboard assembly«:Mouse)

System board
Mouse

01 291000

System board(1.2 cache)

CPU card

02XXXXXOSCSI drive(SCSI)

Symptom-to-FRU Index
The symptom-to- FRU index lists the symptoms and errors
and the possible causes. The most probable cause islisted first. Use this index to help you decide which
FRUs to have available when servicing a computer.

No-Beep Symptoms

FRU and Action

Symptom or Error
No beep, power on LED not

DC/DC card

0250100X

Audio card

lit, and a blank LCD during

AC adapter(Audio)Sub audio card

POST.

Battery

System board(See "Power Systems

System board

Checkout" on page 12 before

CPU card

IOEDXXXX

Video card

(Video)System board

replacing any FRUs.)
No beep, power on LED lit,

DC/DC card

and a blank LCD during

System board

POST.

CPU card(See "Power Systems
Checkout" on page 12 before
replacing any FRUs.)
No beep during POST but

System board (speaker)

system runs OK.

CPU card

Beep Symptoms

FRU and Action

Symptom or Error
Continuous beep.

System board

One beep and a blank,

LCD assembly

unreadable, or flashing LCD.

Interposer card
DC/DC card
Base memory card
System board

Four short beeps followed byBattery pack

one long beep during battery

DC/DC cardcharge operation and battery

System board

power status LED keeps
lighting yellow, orange, andgreen repeatedly.

26

ThinkPad Power Series 850

Hardware Maintenance Service

27Symptom or Error

FRU and Action

Four short beeps followed byBattery pack

FRU and Action

Symptom or Error

System board

Printer problems.

one long beep during battery

11.)

Parallel port device cablecharge operation and battery(See "Printer" on page

power status LED keeps

Serial or parallel port device

Deviceproblems.

Device cable

lighting orange.

System board

M iscellaneous Symptoms

Battery power status LED

Battery packkeeps blinking yellow during
battery charge operation with
AC adapter.

Symptom or Error

FRU and Action

LCD screen unreadable or

LCD assembly

characters missing pels.

LCD cable assemblyVideo card
System board

Vertical or horizontal line

LCD assembly

Incorrect LED status, but

System board

system runs OK.

If the problem remains, see "Undetermined Problems" onpage 10.

defects on the LCD screen.
LCD backlight not

LCD assembly

functioning.

LCD power cable
LCD cable assemblyVideo card
System board

LCD backlight intensity not

LCD assembly

adjustable.
LCD contrast not adjustable.

LCD assembly

One or more keys do not

Keyboard assembly

work.

System board

System hangs or

Press the power shutdown

intermittently hangs.

switch(See "Undetermined
Problems'' on page 10 before
replacing any FRUs.)

If "ThinkPad Power Series"
is displayed continuously,
replace the system board.
If the user's defined screen
does not appear, ensure there
is no problem with theoperating system; thenreplace the system board.

The system does not suspend

Operating systemor resume.

System board

The system does not powerPress power shutdown

off.

switchSystem board

Real-time clock is inaccurate.

Backup battery
System board

28

ThinkPad Power Series 850

Hardware Maintenance Service

29

Parts Listing

39

30

ThinkPad Power Series 850

FRU List
84G4530. Camera Assembly

2

84G4529. Display Assembly, TFf(VGA)2

29H9928. Display Assembly, TFf(SVGA)

3

29H8168. Display Bezel Assembly(VGA)

3

29H8143. Display Bezel Assembly(SVGA)

4

85G2 719. Display Rear Cover Assembly

5

29H82 2 3

. LCD Cable Assembly(VGA)

5

29H8149. LCD Cable Assembly(SVGA)

6

29H82 2 4

. LCD Power Cable

7

85G2 72 0. Display Hinge

8

84G4522. Hinge Cap, Left

984G4523. Hinge Cap, Right10

29H8030. Middle Cover AssemblyII

29H8166. Center Cover Assembly

12

84G5521. LED FPC Card

13

(Note). Keyboard Assembly

14

85GOI53. Hard Disk Drive, 540MB

14

85GOI57. Hard Disk Drive, 810MB

14

30HI471. Hard Disk Drive, 1.2 GB

15

84G4538. CD-ROM Drive Assembly

16

84G4597. FDD Drive Assembly

17

29H8108. Shield Assembly

18

92G7239. 4MB IC DRAM Card18

92G7242. 8MB IC DRAM Card18

92G7279. 16MB IC DRAM Card18

92G7282. 32MB IC DRAM Card

19

39H1266. Standby Battery

20

84G4535. Backup Battery

21

85G2677. Battery Pack, Wff

22

84G4511. Speaker Assembly

23

29H8029. Bracket Speaker Left

24

84G4513. Bracket Speaker Right

25

84G4514. Interposer Card

26

29H8106. DC/DC Card

27

29H8105. Video Card

28

29H8104. Main Audio Card

29

29H9925. Sub Audio Card30

84G4542. Audio FPC Cable

31

29H8147. CPU Card

31a

29H8146. CPU Card Door

32

29H8148. Microphone Assembly

33

84G6545. 8MB DIMM Card

33

84G432 4. 16MB DIMM Card

34

84G4524. 1/0 Door

35

84G4596. ISA Bus Door

36

29H8167. Battery Door

37

29H8102. System Board w/o DIMM

38

29H8101. Base Cover Assembly

39

85GOI67. AC Adapter, Wff

39

85GOI68. AC Adapter, Japan40

29H992 7. Inner Structure Holder

Hardware Maintenance Service

31

.. Bush - Display
41

29H8099. Audio Cable, Twisted Pair

84G4517. Keyboard Catch Group

42.. Keyboard Latch, Left

43.. Keyboard Latch, Right

44.. Keyboard Catch, Left

45.. Keyboard Catch, Right
84G4525. PCMCIA Door Assembly.. PCMCIA Door

46
47.. PCMCIA Latch

48.. PCMCIA Door With Window
85G5457. External FDD Drive Cover

84G9870. Quick Charger, Wrr

84G9871. Quick Charger, Japan

29H8169. Mechanical Group49.. Plate - Camera Blind

50.. Bezel- FDD

51.. Holder - Keyboard Left

52.. Holder - Keyboard Right

53.. Plate - Keyboard Left

54.. Plate - Keyboard Right

55.. Latch - Display Left

55.. Slide - Display Latch Left

56.. Latch - Display Right

56. . Slide - Display Latch Right

57. . Spring - Display Latch

58.. Plate - Audio Card Insulator.. Shaft VO Door.. Screw - M 2.5, L=4, Zinc.. Spacer - Display.. Tape - Keyboard Latch Left
. . Tape - Keyboard Latch Right.. Bracket - Display Lower

Keyboard Assembly
29H8109

U.S. English

29H8110

U.K. English

29H8101

German29H8102

Swiss German

29H8113

French29H8114

Swiss French

29H8115

Italian

29H812 8

Swedish29H8129Dutch

29H8130

Spanish29H8131

Danish29H8132

Belgian

29H8133

Norwegian

29H8134

Arabic29H8135

Hebrew

29H8136

Portuguese

29H8137

Turkish29H8138

Greek

29H8139

Latin American

29H8140

Canadian French

29H8141

Japanese.. Screw - M 2.5, L=6, Zinc.. Screw - M 2.5, L=6, Black Zinc.. Screw - M 2.5, L=8, Zinc.. Screw- M 2.5, L=14, Zinc.. Screw- M 2.5, L=16, Zinc.. Screw- M 2.5, L=l8, Zinc.. Screw - M 2.5, L=24, Zinc.. Screw - M 2.5, L=5, Pan.. Screw - M 2.5, Self Tap.. Screw - M 1.4, L=6.. Stud - M 2.5, L=IO.. Stud- M 2.5, L=18.. Stud - M 2.5, L=7.. Screw - Hex, 5mm.. Screw - Hex, 7mm.. Cover - Screw.. Screw (M 2.5, L=6, Plastic).. Plate- EMI #I.. Plate - EMI #2.. Plate - EMI #3.. Plate - EMI #5. . Plate - EMI #6. . Tape - Insulation.. Clamp - LCD Power Cable A.. Clamp - LCD Power Cable B

Hardware Maintenance Service

32

ThinkPad Power Series 850

33

Note 2: AC Adapter

Option List
85G2671

Battery Pack, U.S.

30H1403

U.S.

85G5411

Battery Pack, EMEA

30H1405

U.K.

85G5412Battery Pack, Japan

30HI406

EMEA

92G7238

4MB IC DRAM Card

30H1407

Switzerland

92G7241

8MB IC DRAM Card

30H1408

Italy

92G7234

16MB IC DRAM Card

30H1409

Denmark
Israel92G7235

32MB IC DRAM Card

30H1410

92G7255

8MB DIMM Card

30HI411

Latin America

92G7257

16MB DIMM Card

30H1412Japan

30H1388

Hard Disk Drive 540MB, U.S.

30H1390

Hard Disk Drive 54 0MB, EMEA

30H1391

Hard Disk Drive 540MB, Japan

30H1392

Hard Disk Drive 810MB, U.S.

30H1394

Hard Disk Drive 810MB, EMEA

30H1395

Hard Disk Drive 810MB, Japan

Accessories•

The warranty times for accessories are different from thewarranty time for the system unit. Some of theaccessories related to services are:30H1467

Hard Disk Drive 1.2GB, U.S.

30Hl 468

Hard Disk Drive 1.2GB, EMEA

30H1469

Hard Disk Drive 1.2GB, Japan

49G2169

06H5985

Microphone - Peavy

54G0443

Key Guard, EMEA

30H1519

Mouse - 3 Button, U.S.

54G0441

Keyboard/Mouse Connector

30H152 0

Mouse - 3 Button, EMEA

30HI52 1

Mouse - 3 Button, Japan

85G2715

Camera, U.S.

85G5448

Camera, EMEA

85G5449

Camera, Japan(Note I)

Quick Charger(Note 2 )AC Adapter

Key Guard, U.S.

Note 1: Quick Charger

34

85G2662

u.s.

85G2663

U.K.

85G2664

EMEA

85G2665

Switzerland

85G2666

Italy

85G2667

Denmark

85G2668

Israel

85G2669

Latin American

85G2 670

Japan

ThinkPad Power Series 850

Hardware Maintenance Service

35Power Cords

ThinkPad Power Series 850
Hardware Maintenance
Reference

6=�

f
l

This section provides the reference information for thecomputer. It includes:•
Product overview•
Component descriptions•
Operating requirements•
Specifications•
Special tools•
Repair information•
Removals and replacements•
Locations

Product Overview

10 �

The computer, the ThinkPad Power Series 850, is alightweight, portable computer with a CD-ROM drive.
The keyboard is the primary means of data entry andediting; however, a mouse can be attached to thecomputer via a keyboard cable with a separator.

11�
Index

Power Cords

Warning: Use the power cord certified for your country.

1
2
2
3
4
5
6
7
8

The portability of the computer allows you to operate the.
comp uter in various places. It is ideally suited to themobile professional who requires a portable computer forwork. The computer is powered by a rechargeable,
nickel-metal hydride (Ni-MH) battery pack.

Colombia, U.S., Venezuela

13F9959

U.K.

14F0032

Hong Kong, Singapore, U.K.

14F0033

EMEA

13F9978

Italy

14F0068

Australia, New Zealand

13F9940

Denmark

13F9996

Israel14F0086

Bangladesh, Pakistan, Sri Lanka

14F0015t

�he video capturing function is available on selectedmodels.

South Africa

9
10
11

36

Switzerland

14F0050

Thailand

1838574 .

Japan, 2-pin

6454377

ThinkPad Power Series 850©Copyright-IBM Corp. 1995

37

L

Product Description
The computer has the following standard features:•
100-MHz microprocessor•
Color liquid crystal display (LCD)
•

•
•
•

•
•
•
•

Minimum of 16MB random access memory (RAM),
expandable up to 96MB
Video controller(VGA and SVGA)
External diskette drive( l .44MB)
2.5-inch, 1.2GB, 810MB, or 540MB hard disk drive
CD-ROM drive
Audio card
Power cordIntelligent battery pack (rechargeable)
Backup battery

The computer has the following external indicators,
controls, connectors, and ports:•
AC Adapter connector•
JEIDA IC DRAM card sockets•
PCMCIA sockets•
IBM PS/2 Mouse connector•
SCSI connector
Expansion connector•
External diskette drive connector•
External display connector•
Parallel port connector•
Serial port connector•
Audio line-in/out connector•
Headphone jack•Microphone jack•
Audio volume control•
Contrast control slide switch•
Brightness control slide switch•
CD-ROM eject button•
CD-ROM in-use light•
CD-ROM emergency eject button•
Power shutdown switch•
Power switch•
Battery power status light•
PC card in-use light•
Diskette drive in-use light•
Hard disk drive in-use light•
Numeric lock light•Caps lock light•
Scroll lock light•Suspend mode light38

ThinkPad Power Series 850•

Power-on light

Options
Several options are available for the computer.
See"Option List" on page 34 .

Option Compatibility
The computer has no internal expansion slots for standard
PC or PS/2 adapters.

Accessories
Several accessories are available for the computer.
See"Accessories" on page 35 .

Component Descriptions
System Board
The system board contains the computer logic, memory,and adapters.

Microprocessor
The PowerPC microprocessor interprets and performs the
instructions. Its 64-bit processor runs at 100 MHz andcontains an internal cache which has a 16KB instruction
cache and a 16KB data cache. Its operating voltage is+3.3 V de.

Flash ROMt
f The 5 1 2KB flash ROM contains the POST, BOOT,

Resident Setup and Resident Diagnostic code. Algorithms

� for writing data into the flash ROM after the computer ismanufactured are provided. After power-on, the initialcode for the ROM is supplied from the device. A
maximum ROM space of 16MB is reserved; however, thesystem board uses 512KB.

RT/CMOS/NVRAM
These provide the real-time clock and calendar function
and store configuration and vital product data.

Hardware Maintenance Reference

39

The stored data in the RT/CMOS/NVRAM are kept
active by the backup battery when the system power is
not on. If the stored data is lost because of a depleted or
removed backup battery, use Easy Setup to restore thedata.

external diskette drives can be connected at the sametime.

Serial Port

EEPROM

The serial port is fully programmable and supports
asynchronous communication. The 9-pin, D-shellconnector provides the signals to drive a standard
EIA-232D device.

A 64-by-16 type-A EEPROM contains the security
passwords.

Power Management System•

The power management system controls the power
applied to the computer. This reduces the power drain on
the battery when the computer power is on, but not
actively being used.

•LCD
The VGA LCD supports a maximum of 640 by 480 pels.
The SVGA LCD supports a maximum of 800 by 600
pels. The LCD control logic provides the LCD support
functions, which include bias voltage, backlight(brightness) control, and contrast control. Prior to
replacement of the LCD, refer to the notice on page 50.

The parallel port allows the attachment of devices that
accept eight bits of parallel data at standardtransistor-transistor logic (TTL) levels. The port can beused as a general input and output port for any device orapplication that matches its input and output capabilities.
It has a 25-pin, D-shell connector and is designed
primarily for printer&.

External Input-Device Connector
The external input-device connector is located at theright-front of the computer and accepts an external
keyboard, mouse, or numeric keypad.

IC Card Controller

The keyboard/mouse connector (a Y-shaped connector
with cable and available an option) must be used whenthe external keyboard is attached. You can directly attach
an external numeric keypad and a 2-button/3-button
mouse to the external input-device connector.

The IC card controller is integrated on the system board
and can accommodate two IC cards. The slots conformto PCMCIA Release 2.0 and JEIDA Release 4 . 1 .

Diskette-Drive Controller
The controller connects to the diskette drive through one,
26-pin cable connector on the system board. Signals andvoltages are supplied through the connector to the drive.
These signals and voltages can operate the computer's
3.5-inch external diskette drive.

Parallel Port

External Display Connector•

The display connector is used to connect an external� monitor.

For the standard model, a CD-ROM drive is built in. For
users who want to use diskettes, the system unit has aconnector for the detachable external diskette drive.
For users who want to replace the CD-ROM drive with adiskette drive, a kit is provided. Both the internal and40

ThinkPad Power Series 850
Hardware Maintenance Reference

41Operating Requirements

Specifications

The following describes the operations that occur after
power is applied and until the minimum operating
requirements are met:

SystemSize••

Power-On Self-Test (POST)The POST is initiated automatically each time the system
power is switched on. The POST is a series of system
checks and initialization. The POST checks only thoseareas that permit the system to be operational enough toboot the operating system.
After a successful POST, control is then given to theoperating system.

Memory Requirements and Limitations
You can expand the system memory up to 96MB byinstalling different capacities of DIMM and IC DRAM
cards into the DIMM and IC DRAM card sockets on thesystem board.
The computer has two DIMM card sockets on the systemboard that support either 16MB (8MB+8MB) or 32MB
( 16MB+ 16MB) DIMM cards. Two identical DIMM
cards must be added at the same time, one in each DIMM
socket.

•Width: 297 mm ( 1 1 .7 in.)
Depth: 264 mm ( 10.4 in.)
Height: 58 mm (2.3 in.)

Weight•System unit (CD-ROM model): 3.8 kg (8.3 lb)•
Battery pack: 0.7 kg ( 1 .5 lb)
Environment•
Air temperature:
System on: soc to 35°C (41 °F to 95°F)I- System on (with diskette): 10°C to 35°C (50°F
to 95°F)- System off:. soc to 43°C ( 41 op to 109°F)•
Humidity:- System on: 8% to 80%- System off: 8% to 80%•
Maximum altitude: 3048 m (10000 ft)2
Heat Output
160 British Thermal Units (BTUs) per hour (47watts per hour) with power supplied from the AC
Adapter.

The computer has two IC DRAM card sockets on thesystem board. The IC DRAM sockets accept either 4MB,
8MB, 16MB, or 32MB IC DRAM cards. Two identical
IC DRAM cards must be added at the same time, one ineach IC DRAM socket.

1

A maximum of 32°C (90°F) at altitudes higher than
9 15 m (3000 ft).

2 A maximum temperature of 3 1.3°C (88°F) with nopressurized condition.

42

ThinkPad Power Series 850

Hardware Maintenance Reference43

AC Adapter
Input Voltage•
Low range- Minimum: 90 V ac
- Maximum: 137 V ac•
High range- Minimum: 180 V ac
- Maximum: 264 V ac•
Frequency range- Minimum: 4 7 Hz
- Maximum: 63 Hz
Output Voltage•
Operating mode: +20 V de•Charging mode
- Minimum: +9.0 V de
- Maximum: +16.0 V de
Maximum Current
2.50 ASpecial Tools
The following tools are used to service the computer.
•Super Test (Advanced Diagnostics) in Easy Setup•
PCMCIA Wrap Card (PIN 35G4680)•
Tri-Connector Wrap Plug (PIN 72X8546)•
Scratch diskette

Note: These tools are used in Step 0 14 on page 8.
•

Maintenance Utility in Easy Setup
System Information
SCSI Format

Note:
•

Refer to "Maintenance Utility" on page 2 1.

Box Wrench (5rnlm, 7rnlm)

Quick Charger
Input Voltage•
Low range- Minimum: 90 V ac
- Maximum: 137 V ac•
High range- Minimum: 180 V ac
- Maximum: 264 V ac
Output Voltage- Nominal 12 V de
Maximum Current
2.7 A

44

ThinkPad Power Series 850

Hardware Maintenance Reference45Repair Information

Removals and Replacements

This section contains information about removals andreplacements, and locations.

1 000 Opening the Display Assembly

•

•

•

•

•

Do not damage any part. Only certified and trained
personnel should service the computer.
The arrows in the "Removals and Replacements"
section show the direction of movement to remove afield-replaceable unit (FRU) or to turn a screw torelease the FRU. The arrows are marked in numericorder to show the correct sequence of removal.
When other FRUs must be removed before removing
the failing FRU, they are listed at the top of thepage. Go to the removal procedure for each FRU
listed, remove the FRU, and then continue with theremoval of the failing FRU.
To replace a FRU, reverse the removal procedureand follow any notes that pertain to replacement.
See "Locations" for internal cable connections andarrangement information.
When replacing a FRU, use the correct screw size asshown in the procedures.

CAUTION -------,

Note: Open the display assembly as shown below toprevent the computer from falling backward whensome devices are removed.

Before removing any field-replaceable unit (FRU),
switch off the power of the computer, unplug all
power cords from electrical outlets, disconnect any
interconnecting cables, then remove the battery
pack. The batteries used (battery pack, standby
battery, and backup battery) contain small
amounts of harmful substances. Do notdisassemble it, throw it into fire or water, or
short-circuit it. Dispose of the battery pack asrequired by local ordinances or regulations.
••

WARNING -------,The system board and memory card are sensitive to,and can be damaged by, electrostatic discharge.
Establish personal grounding by touching a groundpoint with one hand before touching these units. An
electrostatic discharge (ESD) strap must be used toestablish personal grounding.

46

ThinkPad Power Series 850

Hardware Maintenance Reference

47

r
I

1 005 Camera Assembly, M iddle Cover,
Camera Plate

1 01 0 Center Cover Assembly, LED FPC!

•Opening the Display Assembly ( 1000)••

Camera Assembly D , fJ

Middle Cover IJ - 11
Camera Plate (I

Note:

48

Opening the Display Assembly (1000)

Middle Cover (1005) IJ , II

Center Cover Assembly D - II

LED FPC D - 11

II Do not use any screws longer than 8mm,otherwise the DC/DC card will be damaged.

ThinkPad Power Series 850

Hardware Maintenance Reference49

1 01 5 Hinge Cap, Display Assembly
LCD FRU Replacement Notice••

CAUTION ------.
The liquid crystal display (LCD) includes afluorescent light that contains a small amount of
mercury. Dispose of the LCD assembly as
required by local ordinances or regulations.

•

Opening the Display Assembly ( 1000)
Middle Cover ( 1005) IJ , El

Center Cover Assembly (1010) D - El

Hinge Cap D

Display Assembly D - I'll

The LCD is made of glass, and rough handling or
dropping the computer can cause the LCD to
break. If the LCD breaks and the internal fluid
gets into your eyes or on your hands, immediately
wash the affected areas with water for at least 15
minutes; then get medical care if any symptoms
are present after washing.

If missing or discolored dots appear on the LCD,
carefully read the following note to determine whether
you should replace the LCD:

Important --------.
A small number of missing, discolored, or lighted
dots (on all the time) is characteristic of LCD
technology, but excessive pixel problems can cause
viewing concerns. The LCD should be replaced if
the number of dots satisfies the following condition:•
The number of missing, discolored, or colored
dots in any colored background is 2 1 or more.

Note:

When you need to clean the LCD, gently wipe the
LCD with a dry, soft cloth. Do not use alcohol ordetergent to clean the LCD.
To avoid damaging the LCD, do not scratch or
apply any force to its surface.

50

ThinkPad Power Series 850

Hardware Maintenance Reference51

1 020 Interposer Card
Display Bezel Assembly D , fJ

LCD Power Cable D - II

LCD Cable Assembly D - II

Display Assembly (TFT) D - 1'1•••

Opening the Display Assembly ( 1000)
Middle Cover ( 1005) IJ , II

Center Cover Assembly ( 10 10) D - II

Display Hinge D - lfJ

Display Rear Cover Assembly D - m

Hardware Maintenance Reference

52lThinkPad Power Series 850

53

1 025 Keyboard Assembly, Keyboard Latch•

Opening the Display Assembly ( 1000)•

Middle Cover ( 1005) II , II•

1 030 Opening the Keyboard•

Opening the Display Assembly ( 1000)

Center Cover Assembly ( 10 10) 0 - II

Keyboard Assembly 0 - II
Keyboard Latch 0 - II

54

ThinkPad Power Series 850

Hardware Maintenance Reference55

1 035 HOD Assembly•

Opening the Display Assembly ( 1000)•

Opening the Keyboard (1030)

1 040 FDD Assembly•

Opening the Display Assembly (1000)•

Opening the Keyboard ( 1030)

FDD Assembly D

FDD Bezel D - II

56

,

fJ

ThinkPad Power Series 850
Hardware Maintenance Reference57

1 045 CD-ROM Drive Assembly•

Opening the Display Assembly ( 1000)•

Opening the Keyboard ( 1030)

1 050 Battery Pack, Door (Battery, ISA Bus)
Battery Door 0

Battery Pack 0 - IJ
ISA Bus Door B

CAUTION -------._
Battery packs are capable of delivering highcurrents for a significant amount of time. Do notshort-circuit the battery terminals.

58

ThinkPad Power Series 850

Hardware Maintenance Reference

59

II
!I

I

I
I

1 055 Backup Battery, Standby Battery, IC

Card

•

Opening the Display Assembly ( 1000)•

Opening the Keyboard ( 1 030)•

HDD Assembly ( 1 035)•

FDD Assembly ( 1040)•

CD-ROM Drive Assembly ( 1045)

Backup Battery D

Standby Battery fJ
IC DRAM Card IJ

CAUTION -------.
The backup battery is a lithium battery and cancause a fire, explosion, or severe burn if notproperly used or disposed of. Do not recharge it,disassemble it, heat it above 100°C (212°F),
incinerate it, or expose its cell contents to water.
Dispose of the battery as required by local
ordinances or regulations. When replacing thebattery, use the one that is available as a FRU.
Use of a wrong battery could result in ignition or
explosion of the battery. Replacement batteries
can be ordered from mM or mM Authorized
Dealers.

NOTE -------.
Real-time clock, configuration, and power-on
password data will be lost when the backup battery isremoved. Always reset this data after the battery has
been replaced.

60

ThinkPad Power Series 850

Hardware Maintenance Reference61

1 060 PCMCIA Door•

Opening the Display Assembly ( 1000)•

Opening the Keyboard ( 1030)

1 065 Speaker Assembly (Left), Sub-Audio
Card, Speaker Bracket (Left), Keyboard
Catch (Left)•

Opening the Display Assembly ( 1000)•

Opening the Keyboard (1030)•

HDD Assembly ( 1035)•

FDD Assembly ( 1040)•

CD-ROM Drive Assembly ( 1045)

Keyboard Catch (Left) 0

Speaker Bracket (Left) 0 - lEI

Speaker Assembly (Left) 0 - lEI

Sub-Audio Card 0 - II

Right Speaker

Note:

62

ThinkPad Power Series 850

IJ Do not pinch the cable when you install the
speaker assembly.

Hardware Maintenance Reference631 070 Speaker Assembly (Right), Speaker
Bracket (Right), Keyboard Catch (Right)

1 075 Shield Assembly, Microphone
Assembly•

Opening the Display Assembly ( 1000)••

Opening the Keyboard (1030)••

HDD Assembly ( 1035)•

Opening the Display Assembly (1000)
Middle Cover ( 1005) II , II

Center Cover Assembly (1010) D - II•

FDD Assembly (1040)••

CD-ROM Drive Assembly ( 1045)•

Battery Pack ( 1 050) 0 - 11•

Keyboard Assembly (1030) 0 - II••

Backup Battery, Standby Battery, IC Card ( 1 055)

HDD Assembly (1035)

Speaker Bracket (Left) (1065) 0 - II••

FDD Assembly (1040)

Interposer Card (1020) 0•

CD-ROM Drive Assembly (1045)•

Hinge Cap, Display Assembly ( 1 0 15)

Keyboard Catch (Right) 0

Speaker Bracket (Right) 0 , fJ

Speaker Assembly (Right) 0 - II

64

ThinkPad Power Series 850

Shield Assembly 0 , fJ

Microphone Assembly 0 - II

Hardware Maintenance Reference65

1 080 DC/DC Card, Video Card••••

Middle Cover ( l 005) II , II

Center Cover Assembly ( lOIO) 0 - 11
Interposer Card ( l 020) 0

Keyboard Assembly ( l030) 0 - II

1 085 Audio Card, Audio Cable••••

Middle Cover (1005) II , II

Center Cover Assembly ( 10 10) 0 - IIInterposer Card ( l020) 0

Keyboard Assembly ( l030) 0 - II•

HDD Assembly ( l 035)•

HDD Assembly ( l 035)•

FDD Assembly (1040)•

FDD Assembly ( l 040)•

CD-ROM Drive Assembly (1045)•

CD-ROM Drive Assembly ( 1 045)•

Hinge Cap, Display Assembly ( 1015)•

Hinge Cap, Display Assembly ( l015)•

Shield Assembly, Microphone Assembly ( l 075)••

DC/DC Card 0 , fJ
Video Card 11 - 11

Shield Assembly, Microphone Assembly ( l 075)

Video Card ( l 080) fJ , II

Audio Card 0 - 11

Audio Cable II

fJ�
I=:::

�" 66

ThinkPad Power Series 850(2x)Stud L=7

Hardware Maintenance Reference67

1 090 Inner Structure Holder, Audio FPC••

Middle Cover (1005) II , II

Center Cover Assembly (1010) 11 - 11

1 095 Memory Card••

Middle Cover (1005) II , II

Center Cover Assembly (1010) 11 - 11•

Interposer Card (1 020) II•

Keyboard Assembly (1030) 11 - 11••

HDD Assembly (1035)

Keyboard Assembly (1030) 11 - 11•

HDD Assembly (1035)•

FDD Assembly (1040)•

FDD Assembly (1040)•

CD-ROM Drive Assembly (1045)•

CD-ROM Drive Assembly (1045)•

Backup Battery, Standby Battery, IC Card (1055)•

Hinge Cap, Display Assembly (1015)•

Hinge Cap, Display Assembly (1015)••

Shield Assembly, Microphone Assembly (1075)•

Video Card (1 080) fJ•

Audio Card (1085)••

Video Card (1080) fJ , II

Speaker Bracket (Left) (1065) 11 - 11

Inner Structure Holder II , fJ
Audio FPC 11 - lil

68

ThinkPad Power Series 850•

Interposer Card (1020) II

Shield Assembly, Microphone Assembly (1075),

II

Memory Card
When you install a memory card, make sure the cardis installed with �e comer notch toward the left side;then check that both sides of the card are firmly
latched.

Hardware Maintenance Reference69

1 1 00 System Board
Serial Number -------,
When you replace the system board, do not forget tochange the serial number of the system board. Refer
to "System Information" on page 22.

•

CPU Card ( 1 105)•

Middle Cover (1005) II , II••

Center Cover Assembly (1010) 0 - IIInterposer Card (1020) 0•

Keyboard Assembly ( 1030) 0 - II•

HDD Assembly ( 1035)•

FDD Assembly (1040)•

CD-ROM Drive Assembly (1045)•

Backup Battery, Standby Battery, IC Card (1055)•

Hinge Cap, Display Assembly (1015)•

Shield Assembly, Microphone Assembly (1075)•

DC/DC Card, Video Card ( 1080)•

Inner Structure Holder, Audio FPC (1090) 0 - II•

Audio Card (1085)•

Memory Card (1095)

70

ThinkPad Power Series 850

Hardware Maintenance Reference71

1 1 05 CPU Card

Locations
Rear Side View

<�>J

�
.....

El

72

I (9x)M2.5x4

�6't i'-l,,JThinkPad Power Series 850

D Video CamerafJ Cover Lock Latch
II Power Switch
Ill Audio-Out Jack
II Audio-In JackII ISA Bus Connector
fJ SCSI-2 Connectorm Video-Out JackII Video-In Jackm External Diskette Drive Connector
ID Power Shutdown Switch
m External Display Connector
Ill Parallel Connectorm Serial Connectorm Power Jack Connector

Hardware Maintenance Reference73Front and Bottom View

D Video CamerafJ Cover Lock Latch
II Contrast Control Slide Switch
II Brightness Control Slide Switch
II LCD Screen
m External Input-Device Connector
fJ PCMCIA Slotm Battery Pack Door
D Locking Leverm Speaker Rightm CD-ROM Drivem Disk Eject Holem Disk Eject Button
m Microphone Jackm Headphone Jackm Audio Volume Controlm Speaker Leftm Pointing Click Buttons
m Pointing Stickrm LED

fD

74

I

Battery Power Status Light2

PC Card In-Use Light

3

Diskette Drive In-Use Light

4

Hard Disk Drive In-Use Light

5

Numeric Lock Light

6

Caps Lock Light

7

Scroll Lock Light

8

Suspend Mode Light

9Power-on LightCPU CoverThinkPad Power Series 850

Hardware Maintenance Reference75

Inside View

D LED FPC
fJ Interposer CardII DC/DC Card
II System Board
II Battery Packm Right SpeakerfJ CD-ROM Drive
m Standby Battery
IJ Backup Batterym Sub Audio Card
Dl Left Speakerm Hard Disk Drivem IC DRAM Cardm Audio Card
m Video Cardm Memory Card76

ThinkPad Power Series 850(This page is left blank intentionally.)

Hardware Maintenance Reference

77System Board Connectors

Connector

J5
J17 --� �3
J151
I

J10
J18

J14

J1
J2
J3

J11
J9

78

ThinkPad Power Series 850

J4
J6

DeviceSl

Power Shutdown Switch

S2

Power Switch

11

SCSI-2 Connector

J2

External Diskette Drive Connector

13

External Display Connector

J4

Parallel Connector

J5

ISA Bus Connector

J6

Serial Connector

J7

Keyboard/Mouse Connector

J8Interposer Card

19

PCMCIA Socket

110

Base Memory Card111

DC/DC Card

113

Audio Card

114

Video Card

115

Hard Disk Drive Connector

1 16

Diskette/CD-ROM Drive Connector117

I C DRAM Socket I

118

I C DRAM Socket 2

119

Backup Battery Connector

120Standby Battery Connector

J2l

Password Override Pin

Hardware Maintenance Reference79