Panasonic Plasma TV with flickering screen

[JimmyG]

I have a Panasonic Viera Plasma TV (42PX75U) that the top half of the screen will start flickering intermmittently with a white screen. The TV will actually work fine for about 2 hours or so when I first turn it on, and then the flickering will start. Then it will get worse and then finally the whole picture will completely go away. Then I get the 7 blinking red light. If I unplugged the power to the TV and let it sit for a while, it will work fine again, and then repeat. Any ideas on what card this might be?

[edevans122]

Re: Panasonic Plasma TV with flickering screen

sounds heat related to me. make sure all vents are clean and fans are running properlly

[zacheriaj]

Re: Panasonic Plasma TV with flickering screen

Can you take clear pictures of the back of the tv with the back removed. and then clear pictures of each board. (unplug the tv and let it sit for a good half hour before doing so. Plasmas especially carry enough residual juice to knock you over to the next area code

[JimmyG]

Re: Panasonic Plasma TV with flickering screen

Yes - I will try do that today and reply back to you. I really believe this is heat related. I took the back off and cleaned all the vents real good and set a box fan up to blow on it while it was turned on. It played for a long time without and problems. However, when I put the cover back on and let it run normally, it lasted about 2 hours before it started flickering and then shutting down.

[JimmyG]

Re: Panasonic Plasma TV with flickering screen

I agree - I took the back off of the TV and cleaned it up real good. Then I set a box fan up to blow on the back. I never did shut down, but it did flicker some. When I put the cover back on it and ran it normally, it shut down in about 2 hours.

[Ltank]

Re: Panasonic Plasma TV with flickering screen

Get yourself a infrared temperature gun. Cheap now days. Safety able to check temperature of items without the fear of being shocked. Check IC and Mosfets and transistors.

[tom66]

Re: Panasonic Plasma TV with flickering screen

Could be a bad top buffer board.

[JimmyG]

Re: Panasonic Plasma TV with flickering screen

Zacheriaj - here are the pictures you requested. I was thinking the SU card on the top left might be a suspect for my trouble, since this card is attached to the top half of the Plasma screen. I may have to send you 2 sets of pictures for clarity.

[tom66]

Re: Panasonic Plasma TV with flickering screen

Yes, SU board is the likely cause. SU = top buffer board

[zacheriaj]

Re: Panasonic Plasma TV with flickering screen

Yes, SU board is the likely cause. SU = top buffer board

+1. Shopjimmy appears to be out of stock for that board however there are a few choices on ebay if you find a good seller.

http://www.shopjimmy.com/panasonic-t...u-su-board.htm

http://www.ebay.com/itm/PANASONIC-TH...item27e7915886

[zacheriaj]

Re: Panasonic Plasma TV with flickering screen

That looks like a screw?! Be sure to remove that or you may see a good show lol. Was it there the whole time?

[JimmyG]

Re: Panasonic Plasma TV with flickering screen

Zach - I checked this out . Looked like a piece of fuzz or something. It is gone now.

[JimmyG]

Re: Panasonic Plasma TV with flickering screen

Ltank - that is not a bad idea. Thanks for you reply. How cheap?

[JimmyG]

Re: Panasonic Plasma TV with flickering screen

Zach - are there any other TV parts vendors you would recommend?

[Ltank]

Re: Panasonic Plasma TV with flickering screen

Amazon has one for 20 buck. Lowes and Home Depot has them for a little higher price
http://www.amazon.com/HDE-Temperatur.../dp/B002YE3FS4

[zacheriaj]

Re: Panasonic Plasma TV with flickering screen

Zach - are there any other TV parts vendors you would recommend?

I'll take a look when I get home from work

[zacheriaj]

Re: Panasonic Plasma TV with flickering screen

http://www.ebay.com/itm/PANASONIC-TH...item27e7915886

That's about the cheapest I see with best feedback. Consider you are getting both SU and SC boards you could easily turn around and sell the SC or keep it for a spare. Shopjimmy.com is generally preferred but they are out of stock right now

[JimmyG]

Re: Panasonic Plasma TV with flickering screen

Zach - I ended up purchasing these 2 cards on Ebay. I actually messed up doing the Paypal thing and placed 2 orders for these cards, so now I have 4 cards coming. They were suppose to be here two days ago on Friday, but they never made it. I guess I will get them Monday or Tuesday. May need a little assistance changing out this SU card properly. Do you have any helpful hints? What is the correct procedure on disconnecting the ribbon cables going to the Plasma screen? There is also a weird looking connector close to the bottom of the SU card.

[zacheriaj]

Re: Panasonic Plasma TV with flickering screen

Here's a good video that shows how they disconnect. Try not to touch the contacts on the cable and be very gentle. If the cables aren't seated right, it can cause image problems such as lines on the screen or scrambling. The wire connector looks like it simply lifts up by pinching both sides of it and carefully pulling up. There may be a tab on it to push in too.

https://www.youtube.com/watch?v=sfkeWT6Vp-4

[zacheriaj]

Re: Panasonic Plasma TV with flickering screen

Here's another one and I think this is the one that pertains to your set.

https://www.youtube.com/watch?v=GSKAmP65sHw