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5-7
Distorted audio and loud noise
No
Yes
No
Yes
Yes
No
Distorted audio and
loud noise
Replace R77 and R73
Check whether the output of
the power board is normal.If
abnormal ,change the power
board
Replace Q8,Q10 ,Q12
Check whether R73
and R77 are normal
Yes
Check whether the
muting transistor
Q8,Q10.Q12 are normal
Checking the U5 leads the
feet has no to break to
open
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Check whether the U7 or
U8 powersupply normal
No
Yes
Check the power supply voltages
+12VA
Yes
Check U7,U8
Replace U7 or U8
No
Trouble shooting chart