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J Front out abnormal(For main board)
Front out no sound
or sound abnormal
Is 16,17pin of U503 normal?
YES
Is 3,4,29,30pin of U503 normal?
YES
Is sbw channel normal?
YES
Is mute control normal?
YES
Normal
All manuals and user guides at all-guides.com
NO
NO
NO
NO
Check connection between CN603 and U503
Check U503 and peripheral components
Check U701 and peripheral components
Check U706 and peripheral components
Check Q602,Q610,Q620,Q603,Q702,Q701 and
peripheral components
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