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    #1

    I think my plasma has bad caps

    Has anyone seen a failure like the attached? My Panasonic Plasma TC-P65VT25 started to exhibit this behavior this week. Turn the TV on and the display looks fine. After about 15 mins, these red, blue, and green lines start to appear a few mm high and then grow to about 2.5 inches and remain that way until the tv is shut down and cools off. The lines are always at the same location: bottom of the top left quadrant of the tv.

    Some folks have said look at the A board while others have suggested the SS board (X systain board). The problem does seem to have some analog (capacitor) logic to it since it doesn't show up until the tv has warmed up for about 10 – 15 mins.
    There are few replacement boards remaining and I can only find one used one eBay. I may need to pull the caps and replace myself on existing board. Would appreciate experience from the forum experts.

    Additional photo of the SS board from EBay.
    Thanks
    Attached Files
    Tags: None
    #2
    Re: I think my plasma has bad caps

    that's definitely either A-board or D-board issue and won't be caps. most likely one of the bga chip solders failing under heat.

    I'd probably try D-board As i've read of this before and they went with A-board with no change. the video processing i'm fairly sure is done on the D-boards in these.
    Last edited by tw2005; 10-04-2015, 07:04 PM.

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      #3
      Re: I think my plasma has bad caps

      More likely bad solder joints.....
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        #4
        Re: I think my plasma has bad caps

        Tnpa5149ahp

        http://www.ebay.com/itm/PANASONIC-TC...-/281649859795
        Last edited by tw2005; 10-04-2015, 07:08 PM.

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          #5
          Re: I think my plasma has bad caps

          Maybe access test patterns to be sure? I seem to remember some patterns generated by A-board, others by D-board, would help to eliminate cause.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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            #6
            Re: I think my plasma has bad caps

            I did get into the service mode today and was going to try the mirror functions (horizontal and vertical) to see if the lines moved to the other locations of the TV. Something very interesting happened, when the service menu came on the screen (it just so happened to be in the same quadrant of the screen but not overlapping location) the red, blue, & green lines disappeared. It seemed like the picture was lower resolution while the service menu was displayed but no lines. I flipped it back and forth via the mirror function and the display looked flawless.

            Also I found where the other person who had this problem on his Panasonic replaced his A board and C6 boards and still had the problem. He never posted back on his thread if he was able to resolve it but I will focus in on the D board per thread recommendations.

            Thanks

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              #7
              Re: I think my plasma has bad caps

              Here's a little diagram which also helps reinforce D-board issue as the fault is only half screen. Each processor on the D board controls half the screen
              Attached Files

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                #8
                Re: I think my plasma has bad caps

                I had been in the service menu but didnt realize or have documentation to the test patterns. I ran through them all and NTF (no trouble found) as all test signals displayed properly. That is good - the tv isnt in too bad of shape but not helpful in diagnosing the issue.

                Giving further thought to the D-Board diagram which you provided, where one micro controls one half of the display and the other micro controls the other half does give further credibility to the D-Board as the faulty board.

                My son is having his friends over for his birthday party this weekend and they will be busy gaming on the big screen. After that is over, off with the back of the panel and out comes the d-board. Hopefully I will see some issue on one of the micro leads, else i will go for the ebay used board.

                Thanks

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                  #9
                  Re: I think my plasma has bad caps

                  I'm not an expert but I have repaired a few with the same symptoms and they required new IC's on the buffer boards to fix.

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                    #10
                    Re: I think my plasma has bad caps

                    I changed the D-Board and problem solved. Thanks to all with the diagnostic help and recommendations.

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