| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Philips | GR2.2 28PT482A/05 | Field collapse, lack of width, no sound & red led flickers in sympathy with line on screen | No 14E supply pin 1 jungle chip. Check CP1580 1.6A & diode 6580 | ||
| Philips | GR2.2 28PT482A/05 | Dead with faint tripping from psu - works ok on dummy load | LOPTr s/c & when replaced, sparks from LOPTx | ||
| Philips | GR2.2 25PT410 | Dead - LOPTr goes s/c in secs | Dry joints scan coil panel | ||
| Philips | GR2.2 25MN1550 | No line or field sync | IC7470 TDA2579B tbase gen chip u/s - caused by arcing LOPTx | ||
| Philips | GR2.2 21ST2731/05 | pic shifted to one side and one half of screen is blank | IC7470 TDA2579B | ||
| Philips | GR2.2 / 2.4AA | Won't sw on. 148v is 75v | C 2550 (680nF/250 V) low cap +fuse 1534(315mA)+D 6561 (BZX56C68) | ||
| Philips | GR2.2 | Will not go into Standby, pulsating frame collapse appears. | This fault was found to be caused by D6465 being short circuit. This zener diode is in the Line- Osc stage. 4822 130 80239 8V2 zenerdiode 4822 130 61219 10V zenerdiode 4822 130 34281 15V zenerdiode | ||
| Philips | GR2.2 | White picture with fly-back lines and shuts off. | DC level output signal IC7309 (TDA4680) is too high. Check IC7309 (4822 209 63733). | ||
| Philips | GR2.2 | Whistling LOT. Discharge is audible. Loudness depends on picture. | As a result line output transistor becomes defective. Break earth pin A. This pin connects ferrite core to earth via spring. Cut as close to the plastic holder as possible. This pin is not in the Service Manual. REMARKS : From week 9223 onwards transf | ||
| Philips | GR2.2 | When sw on goes on/off with LED in sympathy | Is heat & tap sensitive - Opto CRN50 (also could be zeners D6663 15v & D666 43v = 25"; 30v = 21" & D6592 30v & D6591 & D6560 1N4148 - many of these diodes are sm) | ||
| Philips | GR2.2 | Very low contrast in picture and text modes. | If pin 15 of IC7309 is disconnected, contrast comes up. Fault suspected in BCL line. Disconnect D6315 to confirm. If contrast comes up with this diode disconnected (4822 130 80887), the fault is in the BCL circuit. Check/replace D6367 - 5.1 volt zener | ||
| Philips | GR2.2 | Vertical lines on GR 2.2 - 90 degree narrow neck chassis | Pos.nr. 2588 becomes 3N3 (5322 122 33446) on main panel | ||
| Philips | GR2.2 | Unstable picture on some programs. | This is valid for sets with ECO IF (AG/QG05 or higher). See service info GR2.2 AA94.01 (4822 727 20094) Circuit diagram D. On IC7004, TDA9815 pin 7, remove C2007 (4n7), change 3002 into 470E. C2004 and C2014 should be together 220 nF. When C2014 = 330 nF | ||
| Philips | GR2.2 | Tripped at sw on with no LEDs | HT ok at 148v when LOP dis'd; when 32v line dis'd set starts up - st/by thy6670 faulty | ||
| Philips | GR2.2 | Totally dead. | Check and replace R3624 and R3625 in the power supply. Codenumbers: R3624 330 kOhm 4822 053 10334, R3625 560 kOhm 4822 053 21564. |