Powerbook G3 Lombard (1999) USB Repair Manual
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Identifying the Lombard Powerbook
If the writing under your display only has the words “Macintosh Powerbook G3” asshown, then you have a Lombard.

The design of the rear ports is as in the picture below. Note the two
USB ports.The Lombard has only USB ports, and no firewire ports.

Identification of Parts

Heat Sync

Sound Board

Display / TFT / Screen
Power / Charger Board

Processor /Daughter Board

Logic / Motherboard

Required Tools
Torx T8 Screwdriver – available from www.powerbookmedic.comFlathead Screwdriver & or Philips Head ScrewdriverKeyboard & Modem Removal

Pull the two keyboard tabs
back and flip the keyboard
back. (Flip back thekeyboard while pressing in
the two tabs. The picture
only shows the left hand tab
being pulled back.)

Remove the three Philips
head screws from the heat
sync as shown. Then, using
the metal “handle”, pull theheat shield up and out. It
should come out easily.

Remove the two Philips
screws from the modem asshown. Then, using small
flathead screwdriver, gently
pry the modem up from it’sconnector and detach themodem cable from themodem.

To remove the keyboard
connector, insert yourforefinger under the plastic
grasp, and gently pull up. (Ifit does not come out easily,gently wiggle it from side toside while pulling up.)Processor Removal

To remove the processor, put theflathead screwdriver on the righthand side of the processor as
shown. Then gently pry up until
the processor pops out. *Do not
use too much pressure. If theprocessor does not easily comeout, simply try another location in
the bottom right hand corner. It
should be relatively easy to popout.

Remove the processor as shown,and place on a static free surface.

Ram Replacement
Note – To change the ram in theupper slot you do not need toremove the processor. You only
need to for the bottom slot.
Using either a flat headscrewdriver or your fingernail, pry
back the metal fasteners holding in
the ram as shown. Do this on eachside. It’s easier if you do them atthe same time. To install new ram,align the grooves, slide in, andpush down.

Hard Drive Removal & Replacement*Note – Some of the pictures show aPismo motherboard. The hard drive
replacement is the same in both models.

Using your thumb and forefinger,
grab the orange cable as shown in
the picture, and gently wiggle backand forth until the cable is loose.
You should now be able to pull thehard drive out using the plastic tab.

*Note: If the hard drive does notcome out easily, then the hard
drive sled may be holding it in on
the back near the power button. If
this is the case, use a flatheadscrewdriver as shown to pull thecage towards you while liftingfrom the plastic tab. The hard driveand cage should now come out.

Remove the four black Torx
screws (2 on each side) with yourTorx T8 Screwdriver. (Availablefrom www.powerbookmedic.com)

Then remove the hard drive cableand hard drive from the hard drive
sled. You must now remove theorange cable going to the harddrive. To do this, grab the cable asshown, and gently pull straight up.
Note: If you use too much force or
do not pull straight up, then you
will bend some of the pins and will
have to straighten them with aflathead screwdriver later.

Screen Removal and Replacement

Tilt the display back, and pull thepower button clutch cover
upwards. (This can sometimes takea lot of force. The more tilted thedisplay, the easier it is to take off.)

Using your Torx T8 screwdriver,remove the four flathead torx
screws on the back of the unit asshown. (Replacement Note: Thesefour screws have flat heads, not therounded heads like the other torx
screws, do not get them confused.)

Using your thumb and forefinger, grab
the inverter board as shown, andgently push it towards the display andup. It will snap right out with ease. Do
this on the left hand and right handsides of the inverter. There are twosnaps. Grab the cable from the inverteras shown, and in a gentle wiggling
motion, remove the cable from its
connector.

Then, grabbing the orange cable asshown, remove it from its connector.
Repeat for the multi colored inverter
cable.

Now, pull the display back up so it isperfectly vertical. Place your hands on
the right hand and left hand side of themonitor, and lift the display out of thecasing.

Bottom Casing Removal
Trackpad RemovalRemove the 5 torx screws as shown.
(There are 3 long silver screws, and2 short black ones.

Using your forefinger, slide theblack plastic sheet from under the
trackpad as shown.

This reveals the orange trackpad
cable. Using your thumb andforefinger, gently wiggle the orange
connector cable from its connector.

Pull this cable back to expose one
silver screw. Using your torx T8screwdriver, remove this screw
along with the visible one to theright of it. (Both are long silver
screws.) Also, remove the black torx
screw as shown in the picture.

Remove the last two torx screws asshown.

Remove the seven torx screws asshown. (Replacement note, the twolonger torx screws go on the far left
and right hand side of the area underthe trackpad as shown)Remove the two cables from theSound AC board as shown. (Notethese are harder to remove thanprevious cables. Using needle nose
pliers, and grabbing on to theconnector and then pulling towards
you may help. If you do this,remember to be gentle.)

The casing will now easily come off.
Work your way around the entire unit
pulling up on the casing as shown.
Start at the back right-hand corner, andwork your way around to the back lefthand corner. Be gentle. If it doesn’tcome up easily, then double check tomake sure you didn’t miss a screw.

Charger Board Replacement

Remove the two long sliver screws
from the charger board as shown.

Then, grab the charger board asshown, and gently wiggle it out of its
connector. The board should comeout with ease. Place the board on a
static free surface.

AC / Sound Board Replacement

Remove the black torx screw asshown.

Pull the rib frame out and fold back asshown.

Then remove the cable coming fromthe modem port.

Now gently pull the sound board up
and out as shown. If the sound board
gives you problems coming out, thenmake sure that the metal fasteners are
not clipped to anything. You can use aflathead screwdriver to gently pry
them back.)

Logic Board Replacement

Disconnect the Pram battery and fanfrom their connectors. Remove thesmall torx screw located next to thefan as shown.

Slide the trackpad release free fromthe motherboard as shown.
(Replacment Note: the spring comesloose simply attach it back to the blackconnector. Make sure the screen
release button works before putting theunit back together.)Next, remove the nut as shown in thepicture. You can either use a smallallen bit or needle nose pliers as thescrew is not on very tight. If you electto use needle nose pliers, make sure
not to let the pliers slip!

Now grab the board as shown, pull up
and out. Make sure to rest is on an
anti-static surface.

To reassemble, work backwards from these instructions, paying special attention to ourspecial reassembly notes.

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