PHILIPS TV Repair: Common Faults and Solutions.


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PHILIPS Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
PHILIPS20PT4331 /78R - CHASSIS L03
Dark screen - no image or active progressive- check the possibility of altered/open resistors 3443/3444. - check ci 7641, in this case it should be normal.
PHILIPS20PT4331 /78R - CHASSIS L03
Intermittent sound (crashes, hiccups) or no sound.- check 4.7nf smd capacitor position 2201, and it is common to have a failure on one side. - check smd capacitor 2202 pin 32 and 33 of the uoc.
PHILIPS20PT4331 /78R - CHASSIS L03
Low or no sound in av.- check 7841.
PHILIPS20PT4331 /78R - CHASSIS L03
Sound increases by itself- check the version of the ci 7200 - tda9370ps/n3/a/1722v2.2, if the mask is from another version below 2.2, the new ci must be requested using code 935278551112 together with the recorded eeprom pos. 7641 by code 480620987908 containing already updated addresses 3ed = ff and 3f5 = ff.
PHILIPS20PT4331 /78R - CHASSIS L03
No tune = channel/station just noise/mute.- check possible alteration of resistor 3349 (27k). see item 5.7 repair tips in the service manual pg. 20.
PHILIPS20PT4331 /78R - CHASSIS L03
Without horizontal synchronization.- check the smd 3492 resistor, the lack of soldering may cause interference in the image.
PHILIPS20PT4331 /78R - CHASSIS L03
No focus when turning on.- remove 47µf 2494 capacitor.
PHILIPS20PT4331 /78R - CHASSIS L03
Noise from the standby speaker.- add the 10nf capacitor code 2238 586 15636 in position 2901 (see service information ts05-005). fet transistor fqpf6n80 (9322 187 17687) and for model 20 and 21"" fet transistor fqpf7n80 (9322 174 27687).
PHILIPS20PT4331 /78R - CHASSIS L03
Mechanical noise in stand by.- check resistor 3520 (1k2) and capacitors 2528 (22µf, 50v), 2520 (10nf), 2452 (22nf) this capacitor was not mounted on the first models.
PHILIPS20PT4331 /78R - CHASSIS L03
Twinkling frame - with/without ""bloom"" expansion.- check possible change in the 1k 3525 smd resistor connected to pin 9 of the ci 7250.- check altered 6451 diode.- check open 3454 resistor.
PHILIPS20PT4331 /78R - CHASSIS L03
Has no colors- check for possible leakage in the 6318 diode (8v2 zener diode), generally the screen has excessive contrast and may turn off intermittently.
PHILIPS20PT4331 /78R - CHASSIS L03
Does not hold memory (loses information).- check for possible leakage in capacitors 2461 or 2462.
PHILIPS20PT4331 /78R - CHASSIS L03
Does not exit service mode or enter without being prompted.- if the power supply uses the fet transistor fqpf7n80 in position 7521, capacitor 2585 (1nf 50v) must be deleted.
PHILIPS20PT4331 /78R - CHASSIS L03
Does not work on 220v.- check possible alteration of capacitor 2528.
PHILIPS20PT4331 /78R - CHASSIS L03
Left channel doesn't work- from the headphone output, check resistor 3981 (120r).
PHILIPS20PT4331 /78R - CHASSIS L03
Does not work (it remains switched off).- check 6505 (zener 22v), 7520 (CI tea1506t) and capacitor 2521. . 20- check capacitor 2528.- check possible alteration of 7515.- check possible alteration of 7421- see item 5.7 repair tips in the service manual pg. 20.- check possible alteration of 3528.- check possible alteration of resistors 3443 or 3444.- check diode 6446.- check welding of diode 6642.
PHILIPS20PT4331 /78R - CHASSIS L03
Does not work (it remains switched off).- check possible leak in capacitor 2429, check voltage at +8v.
PHILIPS20PT4331 /78R - CHASSIS L03
Does not accept remote command- check capacitor 2691 (100µf). - check service information ts04-020.
PHILIPS20PT4331 /78R - CHASSIS L03
Does not open vertically- check smd 7461 transistor.
PHILIPS20PT4331 /78R - CHASSIS L03
List the option swaps- ob1 = 0 (tuner alps), 128 (tuner philips)- ob2 = 192- ob3 = 64- ob4 = 224- ob5 = 72- ob6 = 0- ob7 = 80