LG 15LC1RB-MG Service Manual page 21

No Sound
Check the
input source
Pass
Check the input/output
of U301
Pass
Check the input/output
of U201
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 X301
Re-soldering or
Change the defect part
Change speaker