Panasonic Plasma TC-P50ST30 Horizontal Black Lines

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • busted&disgusted
    New Member
    • Sep 2019
    • 4
    • Canada
    #1

    Panasonic Plasma TC-P50ST30 Horizontal Black Lines

    I have a 2011 Panasonic Plasma HD 3D Viera model notorious for the SC board failure. As per a Google for the dreaded 14 blink code I discovered from info on this forum about isolating suspect boards by disconnecting the power cables and using an ohmmeter on the power terminals and this led me to the SC board. I had it repaired by a nearby technician who replaced the shorted transistors and before I got the board back I wondered if any of the buffer boards are damaged and a YouTube showed how to test these by using the ohmmeter and removing the copper colored ribbon cables to the display and use an ohmmeter on the ribbon connectors front and back side and to ground and according to the video mine were okay. After installing the repaired SC board I now have horizontal black lines across the display. The tech who repaired my board figures I have connection problems on some of the display ribbon cables but as per the buffer board YouTube the ribbon cables should be examined for any signs of exposed copper indicating improperly inserted ribbon cables. Before I powered up the TV I re examined all and no signs of exposed copper and I removed and re installed these gently as they are perhaps fragile. Do I have to remove all the ribbons and perhaps use compressed air and electrical contact cleaner for any possibility of entry of dust or lint or do I possibly have damaged buffer boards? Also as per what is mentioned on this forum about loose screws mounting the boards, I retorqued all screws and yes some had loosened off with use. Any suggestions would be greatly appreciated and at least my Panasonic is attempting to work after 8 years of use compared to numerous posts about other Panasonics of similar models of this vintage dieing a month or two after warranty.
    Attached Files
    Tags: None
    • busted&disgusted
      New Member
      • Sep 2019
      • 4
      • Canada
      #2
      Re: Panasonic Plasma TC-P50ST30 Horizontal Black Lines

      For those of you with similar problems after diagnosing possible buffer board failure during SC board repair/replace it would appear to be ribbon cables not properly seated. I released the latches on the connectors and tapped the ribbon with my finger tip. The faint rows of fine black lines took several attempts to rid them. I guess it would make sense to totally test before reinstalling the back cover.

        Comment

        • tvtimmy
          Badcaps Legend
          • Mar 2015
          • 1160
          • usa
          #3
          Re: Panasonic Plasma TC-P50ST30 Horizontal Black Lines

          Yep.

            Comment

            Previous template Next

            Related Topics

            Collapse
            • howardc64
              TCL 55S425 few horizontal lines, potential failure on both side of panel/buffer board
              by howardc64
              All left and right refers to looking from rear of TV (or looking from front with TV upside down)
              • TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
              • Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
              ...
              07-24-2025, 05:17 PM
            • Ihandyrepair
              Samsung QN70Q6DTA Ghost or horizontal lines after tape fix horizontal line
              by Ihandyrepair
              Hi guys

              I just started fixing 4k TV few months ago. so I am still learning a lot
              I got this tv from friend complaint is ghosting or horizontal lines on image.

              never saw the original symptom but I took the tv back home. the funny part is that after bringing to home, the tv worked fine no issue for 3 weeks.
              then it started to show the ghosting white image.
              I started using the tape method, but this tv does not have a T con board and it has only 1 ribbon cable from main board to the tv panel.
              it has 3 thin small boards at the bottom of the...
              12-05-2022, 04:18 PM
            • ggil44
              Sony XBR-65X750D Horizontal lines bottom of screen
              by ggil44
              Hi, I have a Sony XBR-65X750D that has horizontal lines at the bottom 6 inches of the screen. These lines appear to be every other line because the picture is still quite visible behind those lines. The lines appear all the time with a few other lines above and below the 6 inch level blinking on and off at about 2 second intervals. I'm not sure if this is a panel issue or power supply/main board problem. I did replace the T-Con board without any change in the problem. Any suggestions you might have would be greatly appreciated. Thanks,
              05-30-2023, 07:51 PM
            • CyberNinja
              Samsung plasma 50" TV, model PN50C540G3F, has black horizontal lines
              by CyberNinja
              First, the black horizontal lines even overlay the TV's menu. Does this behavior indicate that it's the plasma panel that's defective? If not for the black lines, the TV works just fine. I've cleaned the 6 connectors between the panel and the Y-buffer board, causing no change in the black lines. Visually, the 12 ICs on the Y-buffer look brand new (no holes, etc.). I put my fluke meter in continuity mode and tried to perform the "short" test on the 6 panel ports and found many shorts. But I don't think I'm doing the "short" test correctly and I'm hoping someone can provide guidance....
              01-10-2021, 09:38 PM
            • jm1234
              Panasonic plasma TX-P42ST50 - 6 blinks
              by jm1234
              Hi,
              anyone able to provide the service manual for old plasma Panasonic TX-P42ST50E?
              It turns off almost immediately (0~5 seconds after pressing the on/off button) and starts flashing the red diode 6 times.
              I disconnected the left-hand side board (SC?, both the ribbon cable and the power cable to it) and also another ribbon going to bottom left board. Then the led signal is 8 flashes. According to service guide to another Panasonic plasma it would mean the left-hand side board is faulty. But I'm not sure it 100% applies to my model.
              I checked that board for any obvious faults...
              05-22-2024, 06:59 AM
            • Loading...
            • No more items.
            Working...