| Make | Model | Problem | Solution | Date |
| | | |
| Found: 4551
|
| Philips | 2B | No sound with reception of mono transmitters. | Check and replace if necessary IC7102 (U2830B; 4822 209 73756) on the
stereo decoder | 14-09-04 |
| Philips | 2B | No sound, picture OK (Sound OK via SCART) | Check IC 7103 (TDA 8405; 4822 209 70934)
| 14-09-04 |
|
|
| Philips | 2B | No sound, picture OK (Voltage on pin 5, 7 IC 7220 present) | Replace IC 7220 (TDA 1521Q/N2; 4822 209 73311).
Also check soldering-points of SOPS-transformer (T5663)
| 14-09-04 |
| Philips | 2B | No sound. OK via SCART | Check and replace if necessary C2179, 330uF/16V.
| 14-09-04 |
| Philips | 2B | Only UHF tuning (option changed) | Replace IC 7925 by ST24C02CP (4822 209 62098) and connect a
Zenerdiode BZX79/C5V6; 4822 130 34173) from both pin 5 and pin 6 of
IC 7925 to earth (anodes to earth).
Align the service option and picture adjustments. | 14-09-04 |
| Philips | 2B | Page header suppression | Page header suppression
-----------------------
Since the BBC changed the CEEFAX format, receivers with fastext
will display the page header continuously when the set is in
subtitle mode (page 888). The problem is only observed on BBC
recorded programmes | 14-09-04 |
| Philips | 2B | Pic blanked out | 6 x 33Kohm resistors, 2 in series in each color circuit on theTube-board to be different. If just 1 of them different from the rest, the TDA goes in blanking and remains that way.....Replace them ALL! | 14-09-04 |
| Philips | 2B | Picture and sound disappears sometimes | Check and replace IC 7830 (MAB8461P/W155; 4822 209 73465)
See service information CT88-34 | 14-09-04 |
| Philips | 2B | Picture brightness too high; Contrast not adjustable | Voltage pin 19 IC 7300 > 8 V
Check/replace D 6490 (BAV 21; 4822 130 34189)
| 14-09-04 |
| Philips | 2B | Poor and distorted sound; sound OK via SCART | Check/replace IC7102 (U2830B; 4822 209 73756) on stereo decoder
(item 1100)
| 14-09-04 |
| Philips | 2B | Poor copy protected video tape PB. | Mod. | 14-09-04 |
| Philips | 2B | Poor reproduction of copy protected VHS tapes | Poor reproduction of copy protected VHS tapes
---------------------------------------------
Some instances have occurred where VCR reproduction of copy
protected VHS tapes has been adversely affected by the anti copy
signals recorded in the sync period. I | 14-09-04 |
| Philips | 2B | Protection circuit active (set hiccups) | Remove connector M17, +140 V present
Check C 2609 (8,2 nF; 4822 121 40249)
| 14-09-04 |
| Philips | 2B | PSU tripping - stuck in standby. | EEPROM X2402 IC. - recode new IC 26 for Nicam , 18 for non-Nicam | 14-09-04 |
| Philips | 2B | Repair information | Repair information
------------------
It may happen that after replacement of the stereo-decoder panel by
code number 4822 212 22349, the bass-control is insufficient.
Remedy: replace R3174 by a resistor of 75 kOhm.
| 14-09-04 |
| Philips | 2B | Reprogramming micro | In appliances whose serial no. begins with AG 06 or higher, a new uP (MAB8461/W155), a new memory IC (X2402) and for appliances with hyperband a new tuner (UV616S) or a new front end (FE616SQ) are used. The new uP (MAB8461/W155) can be fitted in appliances, whose serial no. begins with AG04 or higher. With this processor the required option is no longer selected with wire bridges and/or diodes, but must be programmed. Procedure: Switch off appliance.
With keys "Open memory" and "Colour +" pressed in, switch on appliance. In the display a 2 digit figure appears which represents the adjusted option code. With the "C/P+" or C/P-" keys set the required option code:
Tuner/Front-end Code
FE616SQ 01; FE618Q 02; FE616Q 03;
UV616S 09; FE616SQ/NICAM 09;
UV618Q 10; FE618Q/NICAM 10;
UV616 11; FE616Q/NICAM 11;
FE644 18; FE644/NICAM 26
Press "Store" key, now the appliance stores the option code and starts in the usual way.
The new memory IC can only be used in connection with the new uP (this memory IC is an EAROM, therefore the buffer battery fails). The new tuner (front-end) can also be used in appliances with the uP MAB8461/W132; in this
case though option diode 6866 must be removed. | 14-09-04 |
| Philips | 2B | Screaming sound from power. | By disconecting thyristor 6698 there is ca.115V on cathode of
D6700/6701.
A microscopical breakage in the print track coming from pin 1 on the
linetransformer 5663.
Fuse 1601 may blow, but not necessarely.
| 14-09-04 |
| Philips | 2B | Set turns to Stand-By periodically. Will not turn on. | Check and replace memory IC 24X02 (4822 209 62098).
| 14-09-04 |
| Philips | 2B | Set whistles (no 140 V) | Remove connector M17, +140 V present
Replace TS 7618 (2SD1577PH; 4822 130 43921) and
replace D 6609 (BY 228/20; 4822 130 41275) and
replace D 6610 (BYW 95C/20; 4822 130 41602).
replace C2616 (1,5 nF; 4822 122 32771) | 14-09-04 |
| Philips | 2B | Set whistles (no 140 V) | Remove connector M17, +140V present.
Reconnect M17, remove R3535.
If +140V and audio present ( no picture ), replace
IC 7550 (TDA 8370 ; 4822 209 70178)
IC 7550 (Replacement ; 4822 209 73309)
| 14-09-04 |
| Philips | 2B | Sometimes no sound, no picture (Voltage +140 V switches off) | Check soldering points of SOPS-transformer (T5663) and
line-transformer (T5620)
| 14-09-04 |
| Philips | 2B | Sometimes no sound, no picture (Voltage pin 5, 7 IC 7220 present) | Check IC 7220 (TDA 1521Q/N2; 4822 209 73311) and loudspeaker(s).
Also check soldering points of SOPS-transformer (T5663).
| 14-09-04 |
|
|
| Philips | 2B | St/by only - EHT rustles up at sw on | Dis'ing scan coils allows psu to work. Removing EEPROM X2402P allows tv to work without sound/pic or front display. Fit 24OC2 & reprog NICAM settings | 14-09-04 |
| Philips | 2B | Stuck in standby. | IC X2402. | 14-09-04 |
| Philips | 2B | Stuck in standby. | D6729 leaky feeds sound mute in s/by mode will work without it. | 14-09-04 |
| Philips | 2B | STUCK IN STBY IF THYRISTOR 6727 REMOVED SET OPERAT | D6729 SC | 14-09-04 |
| Philips | 2B | STUCK IN STBY REMOVE D6734 TO DISABLE STBY COMMAND | AFTER REPLACING EEPROM SET WILL NEED SETTING WITH DEFAULT INFO ( 26 FOR NICAM 18 NON NICAM ) | 14-09-04 |
| Philips | 2B | Top half of picture missing | As the set warmed up the blank area would slowly shrink until it
disappeared completely.
The sandcastle pulse was checked at pin 10 of the TDA4580 and the
pulse width of the frame blanking pulse was found | 14-09-04 |
| Philips | 2B | Unacceptable long heating time of older picture tubes. | Add a diode 1N4148 (4822 130 30621) in serial with diode 6492.
This will not effect the lifetime of the picture tube or the set.
It prevents that the video controller mutes the picture untill the
3 guns are within the same range of emission.
| 14-09-04 |
| Philips | 2B 28CT8890/79R | White screen with normal sound | C2638 4µ7 350v in RGB o/p supply | 14-09-04 |