TH-42PX75
TH-42PX77
PCB DESIGNATION: P board
PART: TXN/P1HNTUS
SYMPTOM: Dead, no relay click and 5V & 15V come on for about 1 second.
Cause: Shorted IC504 (5V regulator IC)
Remedy: Replace IC504
IC504
T.P. for 15V: P25 pins 1 & 2
T.P. for 5V: P25 pins 5 & 6
