| Make | Model | Problem | Solution | Date |
| | | |
| Found: 4551
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| Philips | G90AE 21 GR2350 | No sound | IC7220 I/C sound chip TDA8191 | 14-09-04 |
| Philips | G90AE 21GR2350 | Shuts down with motorboating noise aft 10 mins | Dry joints Q7502 in FOP | 14-09-04 |
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| Philips | G90AE 21GR2550 | Tripping PSU | Check/replace 3 x 33v sm zeners in series | 14-09-04 |
| Philips | G90AE 21GR2552 | PSU shutting down with popping sound. LEDs flashing | HT going down to 20-30V and tripping due to DJ on SMD R3663 | 14-09-04 |
| Philips | G90AE 21GR2554 | "F7" displayed with snow & no control - LED flashes orange | C2843 220µ near LOPTx low cap | 14-09-04 |
| Philips | G90AE 21GR2554 | F7 on screen, no sound, stuck on channel, may be intermittent | C2843 near LOPTx | 14-09-04 |
| 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. | 14-09-04 |
| Philips | G90B | After a while picture disappears, picture comes through scart | Replace channel UV816; 4822 210 50123 or UV818; 4822 210 10321. | 14-09-04 |
| Philips | G90B | Brightness not adjustable | Check D6809 (LL4148; 4822 130 80876) in textdecoder.
| 14-09-04 |
| 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) | 14-09-04 |
| 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 | 14-09-04 |
| 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 | 14-09-04 |
| 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 | 14-09-04 |
| Philips | G90B | Dead | C2545 1n5 3kv s/c | 14-09-04 |
| Philips | G90B | Dence striping on the left side | C2640 (680uF; 4822 124 40739) capacitance has become lower.
| 14-09-04 |
| 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) | 14-09-04 |
| Philips | G90B | Does not function | +100V available.
Replace S5545 (line transformer; 4822 140 10353)
Replace TS7545 (BUT11AF; 4822 130 42679) | 14-09-04 |
| Philips | G90B | Does not function | Voltage +100V available, no horizontal signal on pin 11 IC7470.
Replace IC7470 (TDA2579/N6; 4822 209 72363) | 14-09-04 |
| Philips | G90B | Does not respond to commands from time to time | Check/replace IC7720 (TMP47C634/2414; 4822 209 73222).
| 14-09-04 |
| Philips | G90B | Function knobs on CTV fail | Replace IC 7720 (TMP47C634N-2475; 4822 816 10129)
Important: mount metal shielding with earth on R 3733 | 14-09-04 |
| Philips | G90B | Humm in stand-by. | Replace S 5625 (SOPS-Transformer; 4822 146 21338)
| 14-09-04 |
| 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).
| 14-09-04 |
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| 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. | 14-09-04 |
| 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 (ster | 14-09-04 |
| 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. | 14-09-04 |
| Philips | G90B | NICAM sound module order code | NICAM sound module order code 4822 212 23219 "normal"
4822 212 23347 "black connection lead". | 14-09-04 |
| 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 | 14-09-04 |
| Philips | G90B | No pic for 1st 5 mins - crt htrs lit | C2660 680µ in 9v supply low cap | 14-09-04 |
| 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 | 14-09-04 |
| 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 | 14-09-04 |