JVC TV-20F242 Service Manual page 35

No sound.
The voltage of CD355
and CD356 do change
with the volume key?
YES
The 1st pin of IC352
does it exist DC7.1V?
YES
The 2nd pin of IC352
does it exist DC3.5V?
YES
Investigate 2nd,19th pin of IC301
and the peripheral circuit.
No picture.
Are the adjustment of
the brightness and
contrast standard?
YES
The 55th pin of IC601
does it exist DC9V?
YES
Is the signal output from
the 14th,15th,16th pin of
IC601?
YES
Exchange the IC601.
NO
NO
NO
NO
NO
NO Is the waveform of the 36th
pin of IC601 normal?
Investigate IC601 and the
peripheral circuit.
Investigate speaker and
Investigate D505 and D534
and the peripheral circuit.
Investigate IC352 and the
peripheral circuit.
Adjust the brightness and
Investigate the X602 and the
NO
YES
headphonejack.
contrast.
Investigate AT13V line.
peripheral circuit.
35