Philips Repair Tips

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Make	Model	Symptom	Problem
PHILIPS	31DV3	Intermittent loss of picture and sound, teletext also affected	Check eprom on the teletext pcb. check ic 7751 (kstx1), might be faulty when warm.
PHILIPS	31DV3	Change of threaded in time after rewind	After rewind to tape begin, the above vcrs go to the threaded in position. if no function is requested, after 6 minutes the vcr dethreads to the stop position where it stays for 2 minutes before returning to standby. from week 41 the waiting time at th
PHILIPS	2B 28CT8890/79R	White screen with normal sound	C2638 4µ7 350v in rgb o/p supply
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.
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
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 )
PHILIPS	2B	Stuck in stby if thyristor 6727 removed set operat	D6729 sc
PHILIPS	2B	Stuck in standby.	D6729 leaky feeds sound mute in s/by mode will work without it.
PHILIPS	2B	Stuck in standby.	Ic x2402.
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
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).
PHILIPS	2B	Sometimes no sound, no picture (voltage +140 v switches off)	Check soldering points of sops-transformer (t5663) and line-transformer (t5620)
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)
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)
PHILIPS	2B	Set turns to stand-by periodically. will not turn on.	Check and replace memory ic 24x02 (4822 209 62098).
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.
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.
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 kΩ.
PHILIPS	2B	Psu tripping - stuck in standby.	Eeprom x2402 ic. - recode new ic 26 for nicam , 18 for non-nicam
PHILIPS	2B	Protection circuit active (set hiccups)	Remove connector m17, +140 v present check c 2609 (8,2 nf; 4822 121 40249)