AOC l32w451 Service Manual page 29

32'' LCD TV Color Monitor
5.4 Abnormal display
Check the source
OK
Check signal filter circuit
OK
OK
Check U21, U20
NG
Reset source
NG
Replace the filter or inductance
RF signal
AV, SCART1/2_CVBS signal
S-video SCART2_Y/C signal
PC signal
NG
Replace U20
Check TV system setup
OK
NG
Check Tuner
OK
NG
Check U11
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AOC L32W451
Replace Tuner
NG
Check U3
Replace U11
Replace U3