AOC L27W451 Service Manual page 30

27'' LCD TV Color Monitor AOC L27W451
5.4 Abnormal display
NG
Check the source
Reset source
OK
NG
Check signal filter circuit Replace the filter or inductance
RF signal Check TV system setup
OK
OK
NG
Replace Tuner
Check Tuner
OK
NG
Replace U3
Check U3
AV, SCART1/2_CVBS signal
S-video SCART2_Y/C signal
NG
Replace U11
PC signal Check U11
OK
NG
Replace U20
Check U21, U20
30