50PA6500-UA Power board relay going insane!

[Jeryswan]

I have a plasma TV model # 50PA6500-UA that when the customer plugs it in, the screen flashes on and off and you can hear a relay on the power supply board continuously clicks on and off. I replaced the relay but the problem persisted. After further testing, I noticed that when the main board is disconnected from the power supply board the problem doesn't occur. Any tests or advice that could lead me to a conclusive board that I should replace would be very much appreciated.

[Jeryswan]

Re: Power board relay going insane!

This is the relay we replaced

[Jeryswan]

Re: Power board relay going insane!

here's a couple more pictures.

[petehall347]

Re: Power board relay going insane!

the relay is doing whats its told . now you have to find why its behaving so . does the relay click once with main board removed ?

[tvtimmy]

Re: Power board relay going insane!

Unplug the tv. Unplug the ldvs ribbon from the mainboard to the control board and put a piece of wire in the holes marked auto ext on the control board. Plug the tv back in and check if you have test patterns on the screen.

[chrismurphy]

Re: Power board relay going insane!

a long shot replace the blue cap in the middle next to the large transformer

[Jeryswan]

Re: Power board relay going insane!

the relay is doing whats its told . now you have to find why its behaving so . does the relay click once with main board removed ?

Yes it does click the once. it does not continue to click.

[Jeryswan]

Re: Power board relay going insane!

Unplug the tv. Unplug the ldvs ribbon from the mainboard to the control board and put a piece of wire in the holes marked auto ext on the control board. Plug the tv back in and check if you have test patterns on the screen.

We did the above test and got nothing. It wasn't until we unplugged the main board from the power supply with the rest of the test parameters that the test patterns started. Is it possible that the main board it telling the power supply to turn on and off repeatedly?

[tvtimmy]

Re: Power board relay going insane!

If the tv stays on and goes through the test patterns the mainboard is bad (BGA chip).

[Jeryswan]

Re: Power board relay going insane!

If the tv stays on and goes through the test patterns the mainboard is bad (BGA chip).

Thanks homie. I appreciate ya.

[Jeryswan]

Re: Power board relay going insane!

If the tv stays on and goes through the test patterns the mainboard is bad (BGA chip).

Bought a new main logic and control board. no help. what's next.

[jjanssen7]

Re: Power board relay going insane!

Do post #6. They had a lot of bad blue caps at that location. fixed a few PA series with that problem back in 2015...

See https://www.badcaps.net/forum/showth...t=38197&page=3