Panasonic TC-p55vt30 no picture.

[Malachi]

I've replaced every board in the TV except the main psu and the bottom C boards but all I get are light black and darker black bands.
I know the parts work because I took them out and put them in my p55gt30 and it works.
Sorry about the picture quality. Does it point to a bad plasma panel?

[TVRepairNoobie]

Re: Panasonic TC-p55vt30 no picture.

Why not take the PSU board out of your P55GT30 and C broad and install them one by one to test.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

I can try the psu but since the TV turns on I figured it was ok as far as the 3 C boards at the bottom that looks like too much work for a long shot.
I bought the TV with the 7 blinking led issue.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

I swapped out the psu, still nothing. So that is everything except for the 3 C buffer boards.
Could any expert here tell me if that could be the problem?
If not, I'm done with this TV.
Next is deciding if I should keep the parts as spares or sell them. So if anyone knows which boards besides the SC board are prone to failure, could you let me know?

[Nick's Tvs]

Re: Panasonic TC-p55vt30 no picture.

To much work for a long shot?
If you want to know the problem with your tv, it is not to much work. We can't help you on this side if you are not willing to put in the effort on yours. You have the ideal tool to test your boards, there is no easier way to test a part than plugging it in a working set.

Also you stated that you got a new SC board for the tv since your original one was missing. Has any of the Panasonic guru's on here confirm that your main board and SC board are compatible with one another? Try replacing your main board in the none working set with the main board that the SC board came with to make sure its not a compatibility issue. If you don't have the main board for the tv that the SC board came out of, try replacing it with the exact same suffixed or known replacement.

Also have you tried checking your cables and ribbons making sure that they are seated properly?
If I were you, I would take every board from that tv including those C buffers, every ribbon cable, and wire connector and install them in your other set. Lots of work but if you have the right tools and mind set it shouldn't take more than a couple hours, and it will be a sure way to determine if you have a problem. If you don't have an issue there, then bad panel, if you do, swap out all connectors and ribbons between your boards. If no difference, then swap boards out one at a time.

Good luck!
Never give up until you know for sure. That panel is very nice and it is worth the trouble, trust me!

[Nick's Tvs]

Re: Panasonic TC-p55vt30 no picture.

Oh one last thing, have you tried the SC50 jump with your buffers disconnected? It would help determine that everything in your tv is good except for your SD, SU board and the panel.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

They are good. They all work in the p55gt30.
I've taken every part out of the vt30 and put it in the vt30 except for the 3 C buffer boards and they work.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

So do you guys recommend keeping these parts as spares or sell them? Keep in mind there is no Sc board, which seems to be the harder one to find.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

I can't bring myself to get rid of this tv. Since every board was replaced except for the 3 bottom C buffer boards, does any one familiar with this tv think that is the problem?
All the boards, minus the buffer boards work in my 55gt30.

Would 3 bad buffer boards cause no display?
What are the chances all 3 went bad?
If one is bad, would that cause all 3 not to work?

I also didn't replace the cables from one to the other. Could that be it?

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

Just bought another sc board, all three buffers and cables. So if that doesn't fix it, it definitely is a bad panel, as all parts will have been changed.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

So today the extra SC board came in, so I can work on this tv without taking apart the p55gt30 and taking out the SC board out of it since I only have one.
Here is a picture of the tv. It's on, no flashing led.
No response to menu or anything.
Lighter and darker bands are visible.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

Another picture.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

Could one of the expert people here tell me if they also believe this is a panel fault so I can stop wasting time on it?

[tw2005]

Re: Panasonic TC-p55vt30 no picture.

Honestly, don't know. If you've swappped out the sd,su,sc, p, a, ss in one go into another and it worked that would leave the c buffers, cabling, panel.

I don't know if it's possible for a partial escape of the gas from the panel for it not to work yet not produce a 7 blink.?

When it was originally 7 blink what was shorted? Just the SC or the buffers too?

This is probably nothing but those gnd screws on the sd/su that bolt to the sc. In the photo they appear blac in colour?

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

The black screws us because I didn't have an others. The color doesn't matter does it? Honestly, I don't even remember how many blinks the TV originally had.
When I bought it, through help from the forum, we determined the sc board was shorted.
I sent it out for repair. When I got it back, I tried it in the TV it came out of and all I get is the black horizontal bands.

I put it in the other TV and the TV worked. Took every board but the c buffers out of the working one and put them in the other one no change.
I thought that maybe one of you guys with many years of experience would know if it could be caused by the c buffers.
I've had other plasma with c buffer problems but their was always a picture on the screen except for a black vertical band.
But this is the whole screen with no picture and horizontal bands.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

Just the sc was shorted. I can take the su and sd buffers out of it and put it in the other TV and it works.

[tw2005]

Re: Panasonic TC-p55vt30 no picture.

The black screws us because I didn't have an others. The color doesn't matter does it? Honestly, I don't even remember how many blinks the TV originally had.
When I bought it, through help from the forum, we determined the sc board was shorted.
I sent it out for repair. When I got it back, I tried it in the TV it came out of and all I get is the black horizontal bands.

I put it in the other TV and the TV worked. Took every board but the c buffers out of the working one and put them in the other one no change.
I thought that maybe one of you guys with many years of experience would know if it could be caused by the c buffers.
I've had other plasma with c buffer problems but their was always a picture on the screen except for a black vertical band.
But this is the whole screen with no picture and horizontal bands.

With those bolts what was crossing my mind was whether there was a protective finish that may not conduct and earth the buffers properly to the SC board. That's a floating earth(Vfg) not chassis earth.

I have not seen this before unfortunately.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

Before when I had only 1 sc board, with the silver colored bolts from the other TV, it behaved the same.
Just changed the bolts. No change.
I thought someone might have seen a situation similar to this but I guess it's unique.

[Malachi]

Re: Panasonic TC-p55vt30 no picture.

Ok, well it's become obvious this p55vt30 isn't getting fixed.
Can someone tell me what makes the sc boards go out so often? Should I keep the extra working sc board that I have in case I need to put it into the p55gt30?
I paid $98 and they seem hard to get. I'm thinking if my current one lasts a few years, it might be even hard to find one then. Correct?

[Moreno83]

Re: Panasonic TC-p55vt30 no picture.

The screws are the reason the board fail on all 2011/2012 models. You need lock washer screws.
The factory board+screws got loose because the board ets warm , cold , warm , cold etc. the board expands when it gets warm/hot and the screws get loose. The board cools down and there is even more space between the ground and the board and then at one point they short.