Newsgroup: it.hobby.elettronica.riparazioni
Titolo: PHILIPS 15GR2530/08B / Telaio G90AE

Salve ragazzi, ho un problema con un PHILIPS 15GR2530/08B,
non accende nemmeno il led, fa solo un ronzio nella parte
dell'alimentazione,
purtroppo è parecchio tempo che non metto mano su un TV e questo tipo
di problema non
mi è mai capitato, ho controllato i componenti principali
sull'alimentazione
(diodi, condensatori, etc.) e sembrano tutti in ordine, non ho nemmeno
lo schema
per cercare di capire dove possa essere il problema, ma credo mi serva
a poco.
Ho giá sostituito il 6670 (Thy SFOR5D43) e il finale orizzontale,
controllato tutti gli SMD
sotto la zona alimentazione ma tutto inutilmente.
Qualche buona anima è in grado di aiutarmi???
Grazie mille per qualsiasi risposta.
Saluti, Luigi

 Saluti, Luigi
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Saluti, Luigi
Controlla se togliendo il finale orizzontale il led si accende 


Non credo, il telaio G90 ha la necessità di ricevere il feedback dalla 
deflessione orizzontale prima di "avviare" il processore alle normali 
funzioni, quindi senza finale il processore non si avvia... Sempre se non mi 
sto rimbambendo... 


cmq, se può aiutare
      Philips G90AE Replacing the EAROM Replacing the EAROM.The memory IC 
has been replaced by type ST24C02CP (code no.4822 209 62098).  On some 
receivers however, the circuit will have to be modified.
      a. If the ST24C02CP is being fitted in place of an X2402 no circuit 
changes will be required
      Philips G90AE Servicing the Philips G90AE Chassis See TV Mag Jan 1997
      Philips G90AE Set blocks Voltage on I2C-Bus (pin 5 and 6 IC 7720) < 
4,9 V
      No pulses visible on oscilloscope when selecting another program
      Replace IC 7770 (ST24C02CP; 4822 209 62098).
      Mount metal shielding 4822 466 82783 on uP (IC 7720) with earth to 
jumper 9711.
      Philips G90AE SET DEAD WORKS IF SUPPLY REDUCED TO 90v D6653
      Philips G90AE Set intermittently tripping. Suspect fault around trip 
circuit comprising T7655/7656.
       Replace zener diodes 6657, 6658, 6659 and especially 6655 - 15 volt 
zener.
      Philips G90AE Shut down aft 10 mins with HT low at 30v Tr7652 BC557C - 
check it with freezer
      Philips G90AE SHUTS DOWN ,  TICKING NOISE FROM PSUP T7652   ( BC557C ) 
LEAKY , THEN RAGGED R3668  ( 150R )  AND FIT NEW HT RESERVIOR CAP  47mfd 
C2630
      Philips G90AE Shuts down on full mains - ok on 90v ac Not a prot 
fault - D6653 leaky (supplies opto coupler)
      Philips G90AE Shutting down with a ticking PSU. Tr7652  ( BC557C ) 
leaky , R3668 ( 150ohm )  scorched , Check C2630 HT res
      Philips G90AE Sound int D6272/6278 BAS32 sm in series with 20v supply 
to sound chip IC7220 TDA8191
      Philips G90AE Spare part information Spare part information
      Codenumber channel selector UV615 including hyperband is  4822 210 
10374.
      Philips G90AE Squeal from psu - sound & pic ok R3614 360k; R3618,R3620 
180k; C2630 47µ (HT res cap)
      Philips G90AE Squeal from psu (sound & pic ok) Renew the three bridge 
sm resistors 3620 (180K), 3618 (180K) and 3614 (360K) and the Ht decoupler 
C2630 (47mfd / 160v)
      Philips G90AE Striations A production change has been introduced 
adding the following components in the +95 volt feed to the line output 
stage:
      Description:  Position no. 5558     Code no. 4822 158 10563    Choke 
82uH                                Capacitor 10n 100V   Position
      Philips G90AE Stuck on chan 8, front controls & R/C inop - st/by led 
flashing Replace C2843 [220uf] in 5 volt regulator
      Philips G90AE Switches off and on shortly Selects always program 1 and 
adjusts PP-value.Check C2397 (33nF; 5322 121 41763) on the CRT panel for 
leakage.
      Bend C2397 on picture-tube PCB from picture-tube socket.
      Philips G90AE The upper part of picture consists of few lines Check 
C2475 (33nF/63V; 5322 122 31848).
      Philips G90AE The voltage of +95V line alters Check transistor 7653 
(BC858A; 5322 130 42012).
      Philips G90AE Tripping If HT set at 95v tripping stops but blank 
raster. Xtal filter 1030 s/c with solder
      Philips G90AE Tripping aft 10 mins operation Can be instigated by 
heating/cooling around psu - replaced 150R sm (R3668?)
      Philips G90AE Tripping with clcking thro spkr Same on dummy load - 
Replace C2630/1 47µ 160v. R3668 sm 150R had dropped off. Replaced also 7652 
BC557C & opto coupler as precaution
      Philips G90AE Trips on & off violently aft several mins Ozone smell - 
focus pin arcing - replace crt base
      Philips G90AE Trips rapidly Tr7652 BC557C in pulse width mod in psu
      Philips G90AE Tuning unstable Voltage on diode D 6770 not stable
      Replace D 6770 (ZTK 33B; 4822 130 30959)
      Philips G90AE Tuning, display and remote control not functioning 
Voltage of pin 42-IC7720 low,
      TR7661 defective (BD135; 4822 130 40823).
      Philips G90AE TXT horizontal synchronization missing Check horizontal 
phase discriminator detection filter capacitor C2827 (47nF; 4822 122 32542).
      Philips G90AE Txt poor - looks like purity errors Dry joints wire 
links on main pcb near Txt panel
      Philips G90AE Weak video & no sync TDA5850
      Philips G90AE When fitting psu mod kit Diodes 6608 & 6609 should be 
wired in series and then connected between base/emitter of 7625 (BUT11AF) 
with the anode end of the pair to base. (if not already fitted)
      Philips G90AE When the set is switched on, the SOPS starts tripping. 
If the mains voltage is turned up using a variac, the +95 line supply gets 
to 80 volts then starts pulsing. Check/replace R3668 - 150 Ohms SMD (5322 
111 90098)
      Philips G90AE White screen, not adjustable Check POR-transistor 7663 
(BC858; 5322 130 42012).
      Philips G90AE Will not stay in Standby mode The reason of this fault 
is R3669 220 Ohm in the Power supply. Service code 4822 051 10221.
      Philips G90AE Wont go into st/by - LED goes orange not red D6669 BAS32 
s/c
      Philips G90B 7625 (BUT 11AF) lasts longer 7625 (BUT 11AF) lasts 
longer. Connect two diodes 1N5061 in series from the base of TR7625 to 
earth. The anode side to the base of 7625.
      Philips G90B After a while picture disappears, picture comes through 
scart Replace channel UV816; 4822 210 50123 or UV818; 4822 210 10321.
      Philips G90B Brightness not adjustable Check D6809 (LL4148; 4822 130 
80876) in textdecoder.
      Philips G90B Brightness too high/fly-back line visible Replace IC 7380 
(TDA 8153; 4822 209 73218)
      Replace R 3375  (100 Ohm;  4822 052 10101)
      Philips G90B Contents of memory lost Replace IC 7770 (ST24C02CP; 4822 
209 60098)
      Mount metal shielding 4822 466 82781 on IC 7720 with earth on R 3733
      Philips G90B Contrast can not be stored Contrast goes to maximum when 
pressing PP
      Replace IC 7720 (TMP47C634N-2475; 4822 816 10129)
      Important:  mount the metal shielding with earth on R 3733
      Philips G90B Correction SI G90B no 91.03 (4822 727 19057) Correction 
SI G90B no 91.03 (4822 727 19057) suppressing hum via loudspeaker in 
standby.
      Item 3617 has been printed as 33R value. This should be 220R (4822 051 
10221). In case of hum via loudspeaker in stand-by mode, item 3617 can be 
reduced to 150R; eve
      Philips G90B Dead C2545 1n5 3kv s/c
      Philips G90B Dence striping on the left side C2640 (680uF; 4822 124 
40739) capacitance has become lower.
      Philips G90B Does not function Remove connector G15 and connect lamp 
to +100V
      Lamp does not burn.Replace TS7625 (BUT11AF; 4822 130 42679)
      Replace TS7614  (CNX83A;  4822 130 82034)
      Build-in SOPS repair kit (SBC7023; 4822 310 20491)
      Philips G90B Does not function +100V available.
      Replace S5545  (line transformer; 4822 140 10353)
      Replace TS7545 (BUT11AF; 4822 130 42679)
      Philips G90B Does not function Voltage +100V available, no horizontal 
signal on pin 11 IC7470.
      Replace IC7470 (TDA2579/N6; 4822 209 72363)
      Philips G90B Does not respond to commands from time to time 
Check/replace IC7720 (TMP47C634/2414; 4822 209 73222).
      Philips G90B Function knobs on CTV fail Replace IC 7720 
(TMP47C634N-2475; 4822 816 10129)
      Important: mount metal shielding with earth on R 3733
      Philips G90B Humm in stand-by. Replace S 5625 (SOPS-Transformer; 4822 
146 21338)
      Philips G90B IC7380 flash protection IC7380 flash protection
      When replacing a defective IC7380 (TDA8153) on the CRT base panel, 
additional flashover protection is recommended.  This is provided by adding 
a 4u7 250V electrolytic capacitor between pins 4 and 8 of IC7380 (negative 
to pin 8).
      Philips G90B Intermittently front controls and remote control do not 
work. Checked supply to micro, and it was found to be low at 4.5 volts. The 
cause was found to be D6662 (5V1 zenerdiode; 4822 130 80884), this diode is 
the power supply.
      Philips G90B Mono/Stereo-indication switches Connect a capacitor (1 
uF/63V; 4822 124 20722) and a resistor (1,5 MOhm; 4822 050 21505) in 
parallel.
      In series with this circuit a diode (1N4148; 5322 130 30621) is 
connected (cathode on R/C circuit). Mount this D/RC circuit between pin 3 IC 
7220 (stereo)
      Philips G90B NICAM sound cracking in time with modulation Capacitance 
diode 6312 (BB405B; 5322 130 34953) defective. (very sensitive to heat). If 
IC7300 (CF70123; 4822 130 61304) is defective, it can cause the same kind of 
symptoms.
      Philips G90B G90B NO SND OFF AIR SCART OK IC U2829B ON AUDIO PANEL
      Philips G90B NICAM sound module order code NICAM sound module order 
code 4822 212 23219  "normal"
      4822 212 23347  "black connection lead".
      Philips G90B No colours 4,43 MHz on pin 3 IC 7350 available.
      Replace IC 7350    TDA 8390/N3   (4822 209 61027)
      Modification: C 2352 to 15 pF    (4822 122 32504) ; R 3336 to 3,3 kOhm 
(4822 051 10332)               R 3338 to 2,7 kOhm (4822 051 10272) ;  Remove 
R 3313, 3340, 334
      Philips G90B No pic for 1st 5 mins - crt htrs lit C2660 680µ in 9v 
supply low cap
      Philips G90B No picture, sound OK. Y-signal on pin 25 IC7350 
OK.Replace IC 7350; TDA8390/N3 (4822 209 61027)
      Modification: C2352 to 15 pF    (4822 122 32504)
      R3336 to 3,3 kOhm (4822 051 10332)
      R3338 to 2,7 kOhm (4822 051 10272 ; remove R3313, 3340, 3341, D6336
      Philips G90B No picture, sound OK. CVBS line to IC7360 at 0.5 Volt, 
indicating no signal.
      Check/replace T7032 - BC848. Codenr. 4822 130 61207
      Philips G90B no txt when heated SAA5243P/E txt processor
      Philips G90B No TXT; Error code F7 displayed. Missing reset pulse on 
pin 17 of IC7800 of the TXT panel. Check C2845 (100 uF) in the reset 
circuit.
      Philips G90B No TXT; oscillator on TXT decoder does not function. Add 
C2802, C2803 15pF (4822 122 32504) on the teletext module U1003.
      Philips G90B No vertical deflection +200 V(163) not present  Replace R 
3570 (8,2 Ohm; 4822 052 10828)
      Philips G90B No vertical deflection Vertical signal on pin 1 IC 7470 
present
      Check/replace TS 7502 (BD 939F; 4822 130 42681)
      Check/replace TS 7503 (BD 939F; 4822 130 42681)
      Philips G90B Page 811 appears spontanuously Decoder selects page 811 
and blocks
      Mount new uP (IC 7800) MAB 8461P/W196 (4822 209 62479) on TXT-Decoder.
      Philips G90B Power supply failure In the event of a failure in the 
switch-mode power supply, the switching transistor IC7625 may have failed. 
In this case it is recommended that the opto-coupler IC7614 should also be 
replaced.
      7625: BUT11AF; 4822 130 42679
      7614: CNX83A;  4822 130 82034
      Philips G90B Remote - faulty hand unit - its glued. Remove name plate 
strip drill hole 1cm in from recess.
      Philips G90B Set blocked; no control of functions. Check solder joints 
of resonator 1760.
      Philips G90B Severel patterning apparent on the picture. If the 
pattern is also apparent in teletext mode and external mode, suspect 
decoupling fault from SOPS.  Scope on C2660 - 8 volt feed to 5 volt 
regulator. If ripple is apparent replace C2660 - 680 uF Codenr. 4822 124 
40199  or 1500 uF Codenr. 4822 124 404
      Philips G90B Slow start, led blinking in stand-by mode TR7455 (BC858A; 
5322 130 42012) interrupts from time to time.
      Philips G90B Sound mutes spontanuously Mount two capacitors of 100 nF 
(5322 121 42578; in parallel) between  pin 10 IC 7220 (stereo decoder) and 
earth.
      Philips G90B sound slow to come on & no txt C2846 220µ
      Philips G90B Spare part information Spare part information
      The original TDA8153 (4822 209 73218), on the picture tube panel, is 
not available anymore  A re-disigned complete picture tube panel with 
discrete components is available now with codenumber: 4822 212 22979.
      This panel is supplie
      Philips G90B St/by only EEPROM 20C02
      Philips G90B Trips violently Tr7652 BC858C overheating in opto coupler 
drive cct - Tr leaky
      Philips G90B Tuning unstable Voltage on D 6004 (LLZ-C35) fixed Replace 
U 1000 (UV 816; 4822 210 10365)
      Philips G90B Tuning unstable In some instances it may be found that 
customers complain of tuning drift on the G90 chassis.  This has been found 
to be due to a specific batch of zener diodes fitted in position D6770 
becoming faulty. When replacing this diode the same type (ZTK33B code
      Philips G90B Txt - dist characters/excess contrast/crushed/no col  Dry 
joints on daughter board between main pcb & Txt/Nicam panels
      Philips G90B TXT has too low contrast Remove diode 6813 (BZV55-C7V5) 
from textdecoder unit 1996.
      Philips G90B Vertical stripes on the left side. Check capacitor C2580 
(470 uF; 4822 124 40198).

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