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No sound
comes out at
AV-out J905.
Check sound output
signal from pin 23 &
24 of IC1100 and its
related circuit.
YES
Check IC301 & its
surrounding circuit.
YES
Check IC3801 &
its surrounding
circuit.
NO NORMAL SOUND
Set volume to maximum. Is there
any sound output signal at pin 8 &
12 of IC301?
Check if there is
sound input signal
at pin 2 & 4 of
IC301.
Check input signal
at pin 13, 14 of
IC3801 and its
related circuit.
Check output
signal at pin 25,
26 of IC1100 and
its related circuit.
4 - 3
No sound from the
speaker.
NO
Check connection
to the speaker.
NO
NO
29F-PS370
YES
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