AOC L42H861

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