AOC L42W781HS Service Manual page 26

42‟‟ LCD TV
5.3. Abnormal display
Check the source
OK
Check signal filter circuit
OK
OK
Check U401
OK
Check panel
NG
Reset source
NG
Replace the filter or inductance
Analog TV signal
Digital TV signal
Component, PC signal
HDMI
Check U504
OK
Replace U401
26
Check TV system setup
OK
Check TU1
OK
Check U1
Check TV system setup
OK
Check TU1
OK
Power supply U4
OK
Check U21
OK
Check U9,
Check U202
NG
AOC L42W781HS
NG
Replace TU1
NG
Replace U1
NG
Replace TU1
NG
Replace U4
OK
Check U6,U7
OK
Check U12,U17
NG
Replace U202
Replace U504