TCL LCD20W5HE - 6.4 Abnormal Display Troubleshooting

20” LCD TV TCL LCD20W5HE
22
6.4 Abnormal Display
Check the source
OK
Reset source
NG
Check signal filter circuit
NG
Replace the filter or inductance
OK
Check U106
NG
Replace U106
RF signal Check TV system setup
OK
Check TU101
Replace TU101
AV, SCART1/2_CVBS signal
OK
NG
Check U107
NG
Replace U107
S-video SCART2_Y/C signal
Check U104
NG
Replace U104
PC signal
Check U102
NG
Replace U102
OK
Check U401, U407
NG
Replace U401