AOC envision L37W431 Service Manual page 29

37'' LCD TV
4. No sound
Check the source
OK
Check signal filter circuit
Check Earphone jack
OK
Check U601
OK
Check U502
OK
Check U503
OK
Check speaker
NG
Reset source
NG
Replace the filter capacitance or inductance
NG
Replace the Earphone jack
NG
Check SIF signal
Check AV1、AV2、component signal
Check HDMI signal
NG
Replace U601
NG
Replace U502
NG
Replace U503
NG
Replace speaker
Check TV system setup
OK
NG
Replace TU100
Check TU100
NG
Check U100
NG
NG
Check CS4344
29
Envision L37W431
NG
Check U100
Replace CS4344