MODEL NUMBER
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FAULT
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REPAIR WORK DONE
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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
|