| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| 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 | 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 | ||
| 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 | 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 | Humm in stand-by. | Replace S 5625 (SOPS-Transformer; 4822 146 21338) | ||
| 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 | Does not respond to commands from time to time | Check/replace IC7720 (TMP47C634/2414; 4822 209 73222). | ||
| 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 function | +100V available. Replace S5545 (line transformer; 4822 140 10353) Replace TS7545 (BUT11AF; 4822 130 42679) | ||
| 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 | Dence striping on the left side | C2640 (680uF; 4822 124 40739) capacitance has become lower. | ||
| Philips | G90B | Dead | C2545 1n5 3kv s/c | ||
| 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 | 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 | 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 |