AOC L42W761 Service Manual page 26

42'' LCD TV
4. No sound
Check the source
OK
Check signal filter circuit
Check Earphone jack
OK
Check U401
Check U600
OK
Check U1, U2, U3
Check speaker
NG
Reset source
NG
Replace the filter or inductance
NG
Replace the Earphone jack
SIF signal
AV, Component, PC signal
NG
Replace U401
NG
Replace U600
NG
Check U1, U2, U3
NG
Replace speaker
Check TV system setup
OK
NG
Check TU701
OK
NG
Check U701
Check U103
OK
Check U101
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AOC L42W761
Replace TU701
Replace U701
Replace U103
Replace U101