Re: Panasonic TC-P55GT30 NO POWER/NO LED

Whoopie!

I just replaced the sub power supply board. Relays clicked, no "fireworks." Turned it on and displays input name and then "no input" signal message.

Is there anything I need to adjust or pay special attention to before I close up and input an hdmi?

Both power supply board were replaced.

Thanks for helping

Re: Panasonic TC-P55GT30 NO POWER/NO LED

Sorry for the delay, been "making merry."

I'm not sure on measuring the optocouplers. I see several black lines dividing the boards, and think I can roughly see the AC to DC conversion.

I measured both DC and AC on the main power inlet (sub) and main inlet to the power inlet(P)

It confuses me why if I measure the (P) inlet as DC, I get a (-) negative value, but AC checks around 2 volts. It also, seemed that the (P) voltage decreased from time to time? The main line voltage remains the...

Re: Panasonic TC-P55GT30 NO POWER/NO LED

Sorry about that. I must have measured the wrong side of the connector. I was measuring at the arrow point, but that must be the neutral side. Like I say I'm new at this.

I am able to measure only about 2.4 volts on both the P sub and P main through the P55-P56 connector. There is 118 volts on the main line inlet. The voltage on the P51-P52 connector is pretty low at about 0.25 volts.

Is this a bad P sub board? I haven't tried the P57-P58 connector. Not really sure on that one.

Thanks for taking...

Re: Panasonic TC-P55GT30 NO POWER/NO LED

Moreno83,

I checked, as you said. There is no voltage on the P55 connector. There is no voltage through the P34 loop connector.

Thanks for explaining, I'm really quite the novice. I've been trying to research how this all works. Is there an "on" signal that has to come from the other boards somewhere, before the relays can power on the sub board and then send to the main?

Thanks and have a great day there!

Re: Panasonic TC-P55GT30 NO POWER/NO LED

This is the board that I replaced I've been able to check that the boards are not grounded.
There is power to the sub power board, but nothing through to the P board main connector.

Could this be a problem with the relays on the sub board, or maybe no power from the A board. I'm learning as I go.

Thanks!...

Need some coaching on this.

The TV goes dead, out of the blue. Small pop, quick screen flash, a little smoke.

I removed the back, found an arch burn on the P board, bought a replacement, installed.........nothing. Fuses on P and sub check ok. Pretty sure I have live boards, but can't say at what level.

I've tried using a troubleshooting guide to point out a board, but not quite sure?
No relay clicks on the sub board. Could this be my problem, since, the arch was on the P?

Any ideas, directions?

Re: New Members - please post your introductions here

Greetings,

I was looking for some help with my Panasonic plasma on a different site. Another member pointed me here.

Thanks in advance for my novice questions.

lectrplatr