TH-42PX77
TH-42PX75
PCB Designation: P Board
Part #: TXN/P1HNTUS
Symptom: Dead/power LED off (no blinking code).
Cause: No primary AC voltage inputs due to open fuses caused by Q406 shorting out.
Remedy: Replace F401, F402, Q406 and add C426 in the P board
