Panasonic TH-42PZ77U 10 Blink status

[ryanfan03]

I just started working on this tv and found some helpful advice from some of the other threads. First this had a 7 blink SOS status. I found a shorted FET on the SC board. I lifted both legs and replaced the board to see if it would turn on. The TV now has a 10 blink SOS status. I unhooked the SC board from the power supply and no more blinking. I then replaced just the top (SC2) connector and tried again, no blinks (solid red light). Only when I connect the bottom connector (SC20) does the 10 blink SOS status start. I think I followed this wire to the tuner board (DG?). Does this probably mean that the DG board is dead?

Thanks for the help.

[lookimback]

Re: Panasonic TH-42PZ77U 10 Blink status

I would suspect the SC, as you've already found shorted components on it.

[tw2005]

Re: Panasonic TH-42PZ77U 10 Blink status

5 & 15V is supplied via SC20 so resistance check those and see if one is shorted or low in ohms.That's where I'd start

[tw2005]

Re: Panasonic TH-42PZ77U 10 Blink status

Pin1= P5v, pins 30,31 15v at the Sc20. you could probe those whilst turning the Tv on and see what voltage is there at startup. There is a TP15V point on the board off an inductor L6592

[tw2005]

Re: Panasonic TH-42PZ77U 10 Blink status

15v goes directly to IC6521, FET driver, maybe that's toast?

[tw2005]

Re: Panasonic TH-42PZ77U 10 Blink status

might want to study schematic, also goes to a couple of transistors Q6531,6521 that drive the 2PG001 & RJP6065