AOC L42H861 Service Manual page 25

42"LCD TV
4. Abnormal display
Check the source
OK
Check signal filter circuit
OK
OK
Check U406
OK
Check U401
OK
Check panel
NG
Reset source
NG
Replace the filter or inductance
TV signal
HDMI signal
NG
Replace U406
NG
Replace main board
NG
Replace panel
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Best Buy NS-LCD42HD-09
Check TV system setup
OK
Check TU201
Check U501, U502,
U503, U504
NG
Replace TU201
NG
ReplaceU501, U502,
U503, U504