LG RT-20LA90 Service Manual page 19

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