Panasonic TC-P65V10, Plasma

[jbrand]

I have a Panasonic TC-P65V10, Plasma, from 2010. The screen on the unit often dims, then brightens back, and even sometimes completely blacks out, but comes back after a few seconds.

It is not throwing any power led codes. I opened the panel and tightened all the board ground screws. It still does it. It won't do it until after the unit has been on for about 15 minutes.

When it does it, the SS board buzzes a bit, and the P sustain (?) board transformer seems to buzz.

I am not sure if it's worth looking at or if this is a common problem that you may already know what the issue might be. I'd really like to save it if possible.

[nomoresonys]

Re: Panasonic TC-P65V10, Plasma

Good clear straight on pictures of each board and one of the whole back as to see how everything is connected.

[jbrand]

Re: Panasonic TC-P65V10, Plasma

I just fired it up after reseating the cables from the SS to the P board. Watching the clock to see when it starts acting up again.

I see the VSUS voltage potentiometer on the P board. I've not touched it yet.

In the meantime I am prepping and posting pictures. A few minutes they'll be ready.

[jbrand]

Re: Panasonic TC-P65V10, Plasma

Did not take long for it to start doing it again. Had difficulty getting full single picture. Back up against wall. If not perceivable please advise and I'll move the unit so I can get behind it better.

Caps visibly look good.

[nomoresonys]

Re: Panasonic TC-P65V10, Plasma

Make sure your solder joints are all good on that buzzing transformer, underside of board of course.

[jbrand]

Re: Panasonic TC-P65V10, Plasma

Good idea. Going to go put my ear on it one more time to be sure, then I'll pull it.

How to discharge those caps so I don't kill myself? I know basic electronics, not a pro.

[nomoresonys]

Re: Panasonic TC-P65V10, Plasma

Unplug tv for a while and use a resistor, retest cap to make sure it's 0 v or very low to be safe: https://www.youtube.com/watch?v=2TcVZ2opuNc

[jbrand]

Re: Panasonic TC-P65V10, Plasma

Perfect, thanks. I will check that video.

Yup, it's this one for sure. None of the other coils buzz like this one does. And the buzz sound changes as the picture fades/brightens. It's either that component or something controlling it. The small board LEDs on the SS and SC never go out. They stay constantly lit.

I'll pull that power board and check the solder joints.

[nomoresonys]

Re: Panasonic TC-P65V10, Plasma

That's always a good thing to check, now when you retest, make sure you put in every holding/ground screw and they are tight, so many have shorted shit out by only putting back in a few screws.

[jbrand]

Re: Panasonic TC-P65V10, Plasma

Are these points for discharging the all the caps on the board? Looks like it would be.

[Biruslapio]

Re: Panasonic TC-P65V10, Plasma

https://www.badcaps.net/forum/showthread.php?t=94861

Check your SS board too, I have the 58 inch version of this TV and your SS board is the same part model, this is something that will happen to all these TVs as wear occour.

[nomoresonys]

Re: Panasonic TC-P65V10, Plasma

Are these points for discharging the all the caps on the board? Looks like it would be.

I don't think I have run across those before but it seems like that is what they are for.

[Biruslapio]

Re: Panasonic TC-P65V10, Plasma

those are vsus test points, I guess you can use them to short it if you want some sparks.

[nomoresonys]

Re: Panasonic TC-P65V10, Plasma

Oh crap, bad guess from me, haven't dealt with plasmas for quite a while, guess that discharge label there is just a warning to discharge something.

[jbrand]

Re: Panasonic TC-P65V10, Plasma

It was my guess as well. Where the placement is looks like it, but yeah they are labelled with TP's. I didn't get a chance to pull the board yet. Hunting around for a high watt resistor. Might have to pluck one out of something.

My gut tells me it is the power board issue, but not a cold solder. When it was going haywire I put pressure on that transformer. Didn't change anything.

I found a replacement board. It's on its way here but won't arrive until late next week. I am still going to pull this board and look though.

[tvtimmy]

Re: Panasonic TC-P65V10, Plasma

Take a look at the 5 big blue capacitors on the ss board for cracks on any of them .

[jbrand]

Re: Panasonic TC-P65V10, Plasma

Thanks. All the caps on all boards, visibly, appear to be in good condition. No cracking or leaking.

I think this transformer has a crack in it's housing, possibly.

[jbrand]

Re: Panasonic TC-P65V10, Plasma

Thank you to everyone that helped. New power board arrived. Amazed I could locate the correct revision board but I did. Put the new board in this morning and so far so good. Transformer not hissing at all.

Inspection of the old, original board, did not show any obvious signs of issue. Mounting of transformer appears solid. There are 4 IC's mounted on some heat sinks. I suspect one of those was bad perhaps? If this buy me another year or two of use I'll be a happy camper.

Thanks again.

[nomoresonys]

Re: Panasonic TC-P65V10, Plasma

Glad to hear it, thanks for followup.