Panasonic Plasma Horizontal Lines

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  • ryebred
    New Member
    • Jun 2013
    • 7
    • United States

    #1

    Panasonic Plasma Horizontal Lines

    I have a Panasonic TC-P50G25 plasma TV which was getting thin horizontal lines that appear after the TV had been on for 15 minutes or so. The first picture attached to this post shows what it looks like.

    Tom had said it was either a bad A board or a bad SD/SU board. I found an A board and replaced it but the lines persisted. Then I removed the back cover and hooked the TV up and tried to use a hair dryer to blow hot air on one card at a time to see if I could get the lines to appear quicker which would point to the part that is the culprit. However, with the back off I could not get the lines to appear much at all.

    So, while I had the cover off I took off all the ribbons and connectors on the SD/SU/SC cards and blew compressed air to clean things out and then reconnected everything. Now, I have a different problem. Now I have consistent horizontal bands going across the screen all of the time. They appear right away unlike the original lines. The second picture attached shows what the bands look like.

    I attempted to take the ribbons off and re-hook them up to try and get rid of the bands but have not been successful. So I have a couple questions...

    1.) Does this still look like an SD/SU card issue?
    2.) If I need to replace the SD/SU cards, do I also need to replace the SC card as well? I read in the Panasonic manual that bad SD/SU cards can mess up the SC card so the SC card should be replaced at the same time as the SD/SU card.
    3.) Could this be a ribbon issue as opposed to one of boards?

    Thanks for the help.
    Attached Files
  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #2
    Re: Panasonic Plasma Horizontal Lines

    The solid bands will be the ribbons not seated correctly. I have the same panel and boards as yours. First time I removed my ribbons it took me 2 or 3 goes to get them back right.

    When you reseat them they go in and you feel resistance but a little more pressure and you then feel it wedge in. Not much, maybe a mm or less. There's usually marker on the ribbons to judge whether they're in straight or not.

    Also I suspect if the ribbons are not in correctly the locking latch may not go all the way down, not always obvious.

    Where the lines are they'll line up with a ribbon connector. I'd only reseat the ones where the lines are, obviously with the TV off.

    As for the original fault, that's a tough one. I saw the original post and I did'nt think it was going to be the A board but more along the lines of SC/SD/SU. I guess with this sort of fault you have to start somewhere.

    I've been looking for any image similar to yours in any of the repair guides with no luck.

    If I was guessing maybe SC since the whole panel is affected but a bad buffer could potentially drag down the SC and still affect the whole panel.

    Either way it's a pickle. The SC board is generally the first thing to fail on these and quite a common fault. They're getting harder to find and quite pricey but the buffers can also go too.

    Could be early signs of it going pop.

    If this was my set,

    I'd try the heating trick to see if I could induce the fault but you said you had no luck with that.

    I'd do all the obvious stuff like reseating the connectors, check all the earthing screws on the sc/sd/su boards.

    If that did not sort it, I'd get a set of buffers since they're a little easier and cheaper to source. If you get them from a seller who accepts returns, may help reduce the overall costs a little or resell them.

    That would leave the SC board but all those boards purchased, how much is the TV worth secondhand working?

    Over here maybe $400 -500

    http://www.shopjimmy.com/panasonic-t...0-su-board.htm
    http://www.shopjimmy.com/panasonic-t...1-sd-board.htm

    These are cheap, but no warranty reading through it, does have 100% rating. The only thing I'd confirm is that they are exactly as pictured because they quote suits TC-P50S2. As far as i know that model the boards have no heatsinks and rev AD, pictured is no suffix 5090,5091 which are correct for yours.

    http://www.ebay.com.au/itm/PANASONIC...item3cd2ecdf56
    Last edited by tw2005; 06-29-2013, 08:02 PM.

    Comment

    • ryebred
      New Member
      • Jun 2013
      • 7
      • United States

      #3
      Re: Panasonic Plasma Horizontal Lines

      Thanks for all the information. I finally managed to get those bars to go away. I had to re-seat some of the ribbons 5 or 6 times before the bars would go away. This reminds me of the first generation Nintendo or the Atari consoles where you had the cartridges with the contact points and you sometimes had to insert them 5 or 6 times before the game would load.

      With the back off of the TV the original line problem is not surfacing but I don't want to leave the back off because of the voltages and I have young kids so that is a danger. I will most likely just order the SD/SU cards and try those. If those don't work than I have to assume it is the SC card. Ebay has a lot of them but they are mostly in the UK. I have not found any in the USA so shipping costs would be high.

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #4
        Re: Panasonic Plasma Horizontal Lines

        Originally posted by ryebred
        Thanks for all the information. I finally managed to get those bars to go away. I had to re-seat some of the ribbons 5 or 6 times before the bars would go away. This reminds me of the first generation Nintendo or the Atari consoles where you had the cartridges with the contact points and you sometimes had to insert them 5 or 6 times before the game would load.

        With the back off of the TV the original line problem is not surfacing but I don't want to leave the back off because of the voltages and I have young kids so that is a danger. I will most likely just order the SD/SU cards and try those. If those don't work than I have to assume it is the SC card. Ebay has a lot of them but they are mostly in the UK. I have not found any in the USA so shipping costs would be high.
        Just remember there's numerous revisions for different sized TVs, yours will be Rev AP which I don't believe exists in the UK or at least I'm yet to see one for sale.

        Of the 18 I saw, 6 were either repair services or a repair kit, none of the physical boards for sale are exact replacement, only one will work in yours.

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia

          #5
          Re: Panasonic Plasma Horizontal Lines

          Little correction, your board should be Rev AF, not AP which is the GT25. mine was AF, but I run the AP in it now and has been just fine. AW is the other that will work but has 1 additional smd ceramic cap.

          Comment

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