Hitachi HTD-K210 Service Manual page 55

F Audio abnormal
Have picture,no sound
Check if voltage of R,L pin or
STK402-920 is normal?
Is N1 signal output normal?
Is signal of main board XS7 normal?
Yes
No
Yes
Normal
No
Check STK402-920 and peripheral components.
No
Check N1 and peripheral components.
Yes
Replace main board.
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