N Rear out abnormal(For main board)
Rear out no sound or
sound abnormal
Is the 13,15 pin of
CN603 normal?
Is the 4,14 pin of
U603 abnormal?
Is the 1,7 pin of
U604 abnormal?
Is mute control normal?
Normal
Check connections between Main board and
S&D board
Check connections between CN603 and U603
Check U604 and peripheral components
Check Q605 Q607 Q609 Q610 and peripheral
components
YES
YES
YES
YES
YES
NO
NO
NO
NO
20
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