PHILIPS TVs _ FAULTS AND REPAIR WORKS [MY SERVICE EXPERIENCES]

MODEL NUMBER	FAULT	REPAIR WORK DONE
32PFL3404/78R	Without backlight	UBA2071AT IC 801 with the pin 22 shorted to pin 17.  Replace IC801 (UBA2071AT)
29PT752A/78R	Inoperative	C-2618 (222 x 2KV) and FET-7680  (P16NE06). When replacing c2618, by connecting the TV, the image appeared when the hung like tube weak. Replace C-2618-7680 and FET. Note The FET is on the card remediation E61 east-west.
29PT4631	Normal image, sound normal, dark bar with four fingers on the left side of the screen from top to bottom and characters pulled left	The horizontal driver circuit of these devices is accomplished by a pair of transistors 7461 (BC337-25) and 7463 (BC325-25) in complementary symmetry. Replace these two transistors even though they are measuring as good as they always present themselves with lack of gain. Note the "dash" 25 which corresponds to Hfe transistors. As a precaution also replace the C2405 capacitor between collector and emitter of NPN 7461 (BC337-25).The capacitor C2455 is also critical due to the capacitive reactance at high frequency, so replace it. Also check the polarizations of FET 7400.
29PT4631/78	TV works normal, direpente the image fades and the screen goes black.	Switched the two BC 7461 (337) and 7462 (327) and two capacitors 2405 (220mf 25v) 2455 (47mf 25v) switch without testing.
21PT9467C/78	VERTICAL CLOSED, JUST A STRIPE ON TOP OF THE SCREEN	DIODE BYW36, The RESISTOR, 68RX2W And FLYBACK BSC29-3807F. The BYW36 MUST REPLACE THE TWO AND IF YOU OBSERVE THE FLYBACK LEAK HIGH VOLTAGE
21PT5435/78	NO WORK, JUST WHISTLES SOURCE	Q7421 = BUT11AX.
32PF3320/10	Appears "f" in the image	The TV is in "factory mode. To exit, press both keys "volume" "-" and "program" "-" simultaneously for 5 seconds.
37PF7641D	Turns off after a second or two green LED lit, no sound or picture.	Check 27MHz crystal.
20PT324A/78	Vertical closed at the top and bottom	R3466 changed
29PT4631	There is high voltage. Tensions of the normal source, waveform oscillator normal horizontal; cuts starting immediately.	7461 (BC337-25) with high resistance between base and emitter.
20PT3331	Off after approximately 5 minutes	Replace (Q-7643) BC-546 can be used BC-547
20PT3336	With characters but no picture and brightness.	Replace the resistors (r E R-3442-3459) values ​​of 100k each