Pictures attached. Service menu is shown as I was also looking at how many hours on the TV (862). Service menu was sometimes affected and sometimes not even while the main video was being affected.
Video is being fed by my Denon receiver via HDMI however the snow persists to a non-HDMI input as well (tested PC and an analog input with nothing attached).
I've read reports on the forums of similar issues on LG sets but hadn't seen other Panasonic owners complaining. Anyone else seen similar issues? Anything to try before calling Panasonic/service tech?
I did later find a Youtube video of a similar issue with another Panasonic plasma and they reported it was just a bad solder joint somewhere (repaired under warranty in his case):
I might take a peek inside of mine before bringing it in but I'll admit home repair on a TV this expensive doesn't make me comfortable.
I did call a couple of authorized repair techs and they seemed to think it would be a $400-500 repair. However, they didn't sound familiar with this issue on the Panasonic plasmas and were just ballparking on guesses of the components that might be failing given the behavior.
Replacing the A-Board is fairly straight forward and easy if you can find one. Panasonic probably wants about $250 for one depending on your exact model. Your model has 2 versions. One with an 'A' at the end of the model number and one without. To find which one you have, you need to look at the back. While facing the back, look towards the lower left side where the back cover begins to round to the front. There will be a small sticker. If the sticker is black with white lettering, it is a 'TH50PZ800U'.
If the sticker is white with black lettering it is and will read: 'TH50PZ800UA'.
This is important because the A-Boards are different and CANNOT be interchanged.
The estimate you were given is sounds about right. (No more than $400)
Good luck and let us know how it all works out.
eBay appears to be a good source for these boards.
Please try again. I think after 3 posts you are allowed attachments and links. And, your attachment would help many more people than just the OP.
Thank you all for the enlightened replies. You have proven yet again what a valuable forum this is. The problem continued to increase in frequency so I eventually gave up and brought it in to a tech.
The tech and Panasonic were unable to decide if it was definitively the A or the D board so they ordered both parts that way they could replace whichever it turned out to be. In my case, it was the D board (P/N TNPA 4439). It has now been replaced and my TV is beautiful once more. Hopefully it will stay that way this time.
I was also curious if the caps had gone (I've repaired a projector when its cap had failed in the past) but in the end wasn't eager enough to open up my TV. I probably would have though if I had seen the replies earlier pointing at specific ones... doh. Ah well.
Thanks again for the support everyone. Apologies for not seeing this sooner.
This is -NOT- an A board defect.
There is a minimal chance it is the D board, however, that is very rare.
The LVDS cable runs from the A board to D board, and it's the thin red multistranded cable. Just unplug it on the D board end (you can do this on the 46" by getting your hand down there and carefully unplugging it) then plug it in. Reseat it on the A board end too. The power MUST be off when doing this! That is, completely unplugged!
OMG! Am I glad I read your post! I'm a big fan of reseating contacts. I have solved problems with computers doing the same. I have a this exact Panasonic TH-50Z80U with the exact problem. I almost ordered parts. Before I read the post I used the same approach reseating contacts, but missed the other end of the LVDS cable since it was buried in the back. Thanks to you I found the correct contact to focus on! Success, my TV is 5 years old and no more intense "mosaic red", it's back to that great crisp picture. Thanks again! Sal
So when it started happening again I ended up giving up on the TV, I couldn't justify spending $100 on an old TV that would probably just go bad again. I kept it around because I wanted to check for bad solder joints and caps.
I opened it up the other day and tapped around on the boards with an old toothbrush handle trying to find loose solder connections, but no luck. I decided to google the issue again and found this other thread. I unplugged the LVDS cable from the A board and plugged it back in. It seemed to fix the issue while the TV was apart, but when I put the TV back together again, it started happening again. I googled a bit more and found this thread, then realized I needed to unplug *both* ends. I took it back apart and did that, now it's been working for 3 days!
Thank you so much! This TV is my favorite TV, I like the picture better than any of my others. I'm very pleased it's working again.
My father theorized the contacts on the LVDS cable are probably corroding. He suggested putting dielectric grease on them as he thinks that will solve the problem permanently. Should this issue raise its ugly head again, I'll be trying that! I would recommend that anyone else trying this fix put dielectric grease on the contacts when reseating them.
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