Question about Panasonic Viera TH-50PZ80U Plasma TV

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Black vertical bar starts 11" from left, approx 3" wide and goes from top to bottom. Replaced TNPA4441 board, no fix. Disconnected ribbon to that section of plasma screen and bar turns white with color fringing. Bar present on all inputs and on screen displays. Set is 18 months old, so panel is warranty, but labor and other parts are not. Could this be from the D board? Connection from D board to buffer boards?

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  • Jeffjo Sep 02, 2010

    I've just found some damage to the traces on the ribbon cable from the panel to the C2 board. The panel is NOT under warranty as this set was given as an exchange for an earlier set failure.

    I'm wondering if I trimmed the cable to where the traces as still good, cut off the tabs, and carefully reseated the cable if it might do the trick. Of course if the Drive IC is bad, the cable will probably fail again..The traces that are damaged are the first three of a group of 23 (the cable from left to right has the traces grouped as 1, 3, 23, 7, 23, 3, 2)

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Since you've replaced the C2 buffer board and didn't fix it. It's very unlikely but possible that the D board is defective. Visually inspect the solder joints on the D connector or try to press slightly on it; if pressing the connector works then there is a loose or cold solder joint on the D connector.
The screen should be replace since still under warranty. The price for a new screen might exceed the price of the plasma, even if you pay for labour still something to decide whether to fix or not.
Try contacting panasonic and ask them nicely if they would be willing to cover the labour cost as well.
Good Luck.

Posted on Aug 26, 2010

  • Jaime Hernandez Sep 04, 2010

    You could try cutting them very carefully as they can be easily damage. Try not to cut them more then 1.5 mm because you might not have enough expose copper to make a good contact with the connector on the C2 buffer board.

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