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TROUBLE SHOOTING TABLE
Circuits to be checked:
» A/V circuit.
» Tuner.
» Peripheral circuit of Bus Line.
Snow noise increase.
Yes
Does 9V appear at pin (6) of
No
TU201 (TUNER)?
Yes
Does 33V appear at pin (9) of
No
TU201?
Yes
Does 5V appear at pin (7) of
No
TU201?
Yes
Check TU201, Q200, Q201, Q203
and etc.
15-1
(Continued)
NO PICTURE
Does the snow noise appear
Yes
on the picture tube at max
No
contrast and brishtness
control?
Check IC605, TU201, L202,
and 9V-2 line.
Check IC1757, TU201 and
L203.
Check L201, IC601 and etc.
TROUBLE SHOOTING TABLE
Circuits to be checked:
¥ A/V circuit.
¥ Video output.
¥ Peripheral circuit of Bus Line.
C
Normal
Noise or signal
appear.
Is AV1, AV2 or AV3
Yes
input normal?
No
Does pin (5) of IC402
No
or signal appear?
Yes
Does pin (15) of
Yes
IC2801 noise or
signal appear?
No
Check Q2402,
Q2404, Q2411,
IC2801 and their
peripheral circuit.
(Continued)
C
No snow noise.
Check pin (19) of TU201.
Abnormal
Check TUNER and
its related parts.
Check Q200, Q201, Q203
and their peripheral circuit.
Check IC402, IC451 and
their peripheral circuit.
Are pin (8) waveforms of
Is IC2801 RGB out
Yes
IC3801, IC3802, IC3803
Normal?
normal?
No
Yes
Check the
Check IC2801 and
peripheral circuits
their peripheral
of screen heater
circuits.
(FBT) and the CRT.
15-2
No
Check IC3801,
IC3802, IC3803
and their peripheral
circuits.
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