50" insignia turns on and off repeatedly

[j33jared]

My tv is turning on and off repeatedly anytime it is plugged into the wall. You can hear a click like the tv is coming on and then about 5-10 seconds later will click and go off. It will repeat this process over and over. The screen and sound never makes it on.

I took the back cover off to see if any obvious signs of a capacitor blown or bulged. I didn't see anything that looked out of place. I also didn't notice any burn marks on the boards.

Any advice would be appreciated.

[freakaftr8]

Re: 50" insignia turns on and off repeatedly

Unplug ysus from the power supply then plug in tv and try powering up..does the power supply still click on and off?

[tom66]

Re: 50" insignia turns on and off repeatedly

To clarify, if you are new to PDP (plasma display panel) repair then this is Y-sustain/Ysus (LG terminology), or Y-main (Samsung terminology.)
https://www.badcaps.net/forum/attach...9&d=1390413418

[j33jared]

Re: 50" insignia turns on and off repeatedly

If you look at the first picture I posted, I unplugged the top left plug and the clicking stop. Is this the one you are talking about?

[freakaftr8]

Re: 50" insignia turns on and off repeatedly

yes now plug that back in in on the board on the left unplug and disconnect the upper and lower board that connects the panel to that bored and power up does The clicking stop still or is it still clicking? these two boards that you will be disconnecting are called buffer boards

[freakaftr8]

Re: 50" insignia turns on and off repeatedly

Never mind that. The buffers are part of the ysus. Do you see any burn marks on the square ic's on the left of that board where the ribbons connect to the panel?

[j33jared]

Re: 50" insignia turns on and off repeatedly

I don't see any burn marks.

[freakaftr8]

Re: 50" insignia turns on and off repeatedly

Do you have access to a voltmeter. We are going to have to do some voltage checks.

[j33jared]

Re: 50" insignia turns on and off repeatedly

I have one we use when working on vehicles. I will grab it tonight and see what it does for us. I have only used it a couple times.

[j33jared]

Re: 50" insignia turns on and off repeatedly

Ok sorry I have been out snow plowing the past few days.

Here is the tester I have. Let me know if this will do the trick.

What do I need to test?

Thanks again.

[tom66]

Re: 50" insignia turns on and off repeatedly

That should work, before starting, check a fresh 1.5V AA battery or a car battery to make sure it is functioning properly. (Too many failing multimeters causing odd readings!)

[j33jared]

Re: 50" insignia turns on and off repeatedly

Ok, I will try on a battery I have here out of the pack.

What will I need to do on the TV?

Thanks

[tom66]

Re: 50" insignia turns on and off repeatedly

Check the VS and VA voltages from the power supply -- approx 200V and 60V respectively, though compare against plasma panel sticker to be sure.

[j33jared]

Re: 50" insignia turns on and off repeatedly

Would that be coming out of the plug i removed?

[tom66]

Re: 50" insignia turns on and off repeatedly

Yes, but also there are typically test points on the power board.

[j33jared]

Re: 50" insignia turns on and off repeatedly

Anyway to guide me to those?

[tom66]

Re: 50" insignia turns on and off repeatedly

I can see silver disks, on the board labelled "Vs_TP" and "Va_TP".

[j33jared]

Re: 50" insignia turns on and off repeatedly

Meter is working and I'm in front of TV again

[j33jared]

Re: 50" insignia turns on and off repeatedly

The va tp reads 50 at click and counts down to about 8

[j33jared]

Re: 50" insignia turns on and off repeatedly

Vs seems to get about 1