2. Display normal but not audio output
Source no signal output
or cable connection failure.
NO
Volume Pot damaged.
NO
Speaker damaged.
NO
POWER TRANSISTOR
short circuit or
disconnection.
YES
Fix the problems.
OK
DONE
YES
Change signal source
and cables.
YES
Replace with proper one
YES
Replace with proper one
Pre-AMP circuit and
NO
self-protect component
short circiut or
disconnection.
YES
Fix the problems.
OK
OK