I CDC abnormal(For main board)
CDC does not work
Is 2,4pin of CDC normal?
Check Fb503
Is connection of 1pin of CDC with U201 normal?
Normal
Check correlative print wire
CDC audio abnormal
Is 1,7pin of U501 normal?
Is 3,4,29,30pin of U503 normal?
Normal
Is pin8 of U501 Dc9? If not, check correlative printed wire
else, check peripheral components.
If still abnormal, change U501
Check U503 and peripheral components.
Is 31pin of U503 DC9V?
If still abnormal, change U503
YES
YES
YES
YES
NO
NO
NO
NO
15
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