LG 23LX1RV-MC Service Manual page 18

No Sound(RF,SIDE AV)
Check the
input source
Pass
Check the input/output
of IC1
Pass
Check the input/
output of IC401
Pass
Check the input/
output of IC400
Pass
Check the speaker
Pass
Check the speaker wire
Change source input
Faill
Re-soldering or
Change the defect part
Faill
Check X11
Re-soldering or
Change the defect part
Faill
Check IC403,X601
Re-soldering or
Change the defect part
Faill
Check IC400
Change the speaker
Faill
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No Sound(AV, COMP1,DVD,PC)