A Power Circuit abnormal(For main board)
START
Is 1pin of Q404 DC 12V?
Check D307
Is 40pin of U201 DC 5V?
Is 33pin of U201 DC 5V?
Is 5pin of Q404 DC 12V?
Is 2pin of U404 DC 5V?
Is net of 8V DC 8V?
Is 39pin of U201 DC 3.3V?
Normal
YES
NO
Check Q401 U403 L401and peripheral
components.
Check U201 and peripheral components
Check Q404 Q408 and peripheral components
Check U404 and peripheral components
Check ZD439 and peripheral components
Check U402 and peripheral
components
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Is 26pin of U201 DC 5V?
Check Zd401 and peripheral components.
NO
YES
Check ACC and ACC fuse.
7
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