TCL LCD20W5HE - 6.3 No Display (Green LED)

20” LCD TV TCL LCD20W5HE
21
6.3 No Display (LED indicator green)
Check the source
OK
Reset source
NG
Check LVDS cable
NG
Reset LVDS cable
OK
Check 24V power supply
NG
Return to “6.1”
OK
Check main board power supply
OK
Check U401
NG
Replace U401
OK
Check I
2
C communication
OK
Check panel
NG
Replace panel