Panasonic Th-42pz700u 7 blinks.

[Malachi]

I picked this tv up today with the 7 blink fault.
The sc board is TNPA4250. When I disconnect SC2 I still get 7 blinks.
Connect SC2, disconnect the 2 buffers, 7 blinks.
I check the 2N5307 transistors on the SC board and 6 of them read shorted (meter beeps).
They ones that seem shorted are the top 5 on the left.

Does this sound like a bad SC board?

Service manual says 7 blinks could be SC, SU, SD or D board.
Both of the board LEDs for the SC and the SS are lit, which on other Panasonic models usually indicate they are ok.
Any advice?

The picture should be rotated 90 degrees clockwise.

[Malachi]

Re: Panasonic Th-42pz700u 7 blinks.

Forgot to say, I get about 4.7MOhm on sc2.

[rldev]

Re: Panasonic Th-42pz700u 7 blinks.

Do the 2013 models have leds on the boards? I'm having a similar problem, but i don't see any leds on the board.

[Malachi]

Re: Panasonic Th-42pz700u 7 blinks.

I don't know.

[alexeilb89]

Re: Panasonic Th-42pz700u 7 blinks.

I don't know.

How did you test the transistors? I believe those are MOSFETs not sure if you can test them with just a multimeter. I tried by placing negative probe on Emulator and Positive to Gate (apparently any reading would mean its faulty) could someone here please explain a way to test these MOSFETs with a just a multimeter?

[chrismurphy]

Re: Panasonic Th-42pz700u 7 blinks.

How did you test the transistors? I believe those are MOSFETs not sure if you can test them with just a multimeter. I tried by placing negative probe on Emulator and Positive to Gate (apparently any reading would mean its faulty) could someone here please explain a way to test these MOSFETs with a just a multimeter?

MOSFETS dont usually go open ,almost always short look for short between source to drain