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ONLY A LINE APPEARS
Is the signal at pin 19 of
IC601 normal ?
Yes
Is there a waveform at
IIC BUS line normal?
Yes
Is the signal at pin 5
of IC401 normal?
Yes
Check DY and peripheral circuit.
OSD SCREEN DOES NOT APPEAR
Is there a waveform at pins
22, 23, 24 and 25 of IC101?
Yes
Is there a waveform at pins
54, 55, 56 and 57 of IC601 ?
Yes
Check pin 25 of IC101 and IC601
peripheral circuit.
No
No
No
Check IC401 and VCC
25V line.
Yes
Check IC401 and peripheral circuit.
No
No
No. 52133
Check the peripheral circuit of IC601.
Check IIC BUS line control IC.
No
Check FB401 and peripheral circuit.
Check IC101or IC601 and
peripheral circuit.
Check IC601 at pins 20, 21 and 22
peripheral circuit.
AV-20FD24
35
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