Chosen Solution
The screen works perfectly, then suddenly today after 3 or 4 minutes there are garbled random lines, which stays like this, or else goes black. The sound is usually still working. If i disconnect the power , then switch back on, the picture is ok again for a while. Any ideas? The TV is a 2010 46” Panasonic viera plasma ( TX-P46GW20 ) No problems until today. Below is a video of the problem..
I managed to get the back off the TV. Everything looks in good shape. No ribbons are disconnected, capacitors look ok to the naked eye. Not too much dust and dirt.
dara_acca we need to know your TV’s exact model number otherwise it is really a guessing game. If this happens after a few minute it is usually caused by components overheating as well as bad solder joints. It could be an issue with your buffer boards. It would help if we can see your boards as well as what the screen displays. Post some good pictures of this with your QUESTION Adding images to an existing question
It sounds like there is an issue with the ribbon cables that attach the plasma display to boards that control that display. If you remove the back panel of your TV you will find two circuit boards with several ribbon cables attached. One board controls the horizontal display the other is for vertical display. These boards may be hiding under speakers or other components but will likely be near the edges of the TV. I would unplug and re-plug in all the cable to check that they haven’t come loose over time. If they are damaged you will have to source replacement parts.
