6-4
NG
Continue
Is 5V voltage provided to pin1,pin 2 and pin 3 of S404
in MAIN board.
OK
Check the data signal output on U405
LVDS-O, LVDS-E pin?
Failure point
Printed wire broke
between U405, S404 line.
Failure point
U405 failure.
Failure point
Check Q405and U409.
NG
OK