LG RZ-37LZ30 Service Manual page 15

No sound
Check the input
source
Pass
Check the input
of IC1102
Pass
Check the input
of IC1001, IC1002
Pass
Check the output
of IC1001, IC1002
Pass
Check the
speaker
Pass
Check the speaker wire
Change source input
Fail
Check the pin 56, 57
of IC1102
Fail
Check the output
of IC1102
Pass
Pass
Fail
Check the R1144,
R1140
Change IC1001, IC1002
Fail
Fail
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Fail
Fail
Fail
Change speaker
Change the Defet part
Change IC601
Change R1144, R1140