LG RZ-20LZ50 - Troubleshooting: No Sound

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No Sound
Check the speaker wire
Change source input
Check the
input source
Fail
Pass
Re-soldering or
Change the defect part
Check X11
Check the input/output
of IC1
Fail
Pass
Re-soldering or
Change the defect part
Check the input/output
of IC100,IC101
Fail
Pass
Change speaker
Check the speaker
Fail
Pass