RCA L19WD20 Service Manual page 24

19'' LCD TV
5. No sound
Check the source
OK
Check signal filter circuit
Check Earphone jack
OK
Check U401
Check U601, U6A1
OK
Check speaker
NG
Reset source
NG
Replace the filter or inductance
NG
Replace the Earphone jack
SIF signal
AV, Component, PC signal
Replace U401
NG
Replace U601 or U6A1
NG
Replace speaker
Check TV system setup
OK
NG
Check TU701
OK
NG
Check U701
Check U103
OK
Check U101
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RCA L19WD20
Replace TU701
Replace U701
Replace U103
Replace U101