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No
No
Yes
Yes
Check 5VS, 5VD,
5VA, 6V, 3.3V
of CN2A.
Check the main board.
Is the power
cord well
connected?
Check if the power
cord is correctly
connected.
Is
the output of
D812 6.2V?
Yes
Check ambient
circuit of IC801.
No
6. Power Problem