43UM7100PLB, no picture but have half picture when i disconnect 1 side of panel

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  • sigmeyer
    Senior Member
    • Feb 2020
    • 147
    • Serbia
    #1

    43UM7100PLB, no picture but have half picture when i disconnect 1 side of panel

    Like the title says , this is a very interesting problem , never experienced this before so i thought i'd share and maybe get some help on this. So the problem is as such: TV comes on , some gibberish flashes on screen and the screen remains black , the owner of tv said he heard sound. Now i checked some things cleaned all connections first of all so i dont run in a circle. Then i disconnected one of the cables for the panel , and viola, the left side of screen comes on, then i tried to switch it , with left side disconnected and right connected. Same problem persists. I checked some voltages on the motherboard , and sure enough , when i connect the right flat cable my 30v , and 17v dissapear on the motherboard. I assume they go to the screen.
    Now my question is , is this a motherboard problem , or is it a screen issue?
    This is one of the newer type tvs where tcon board is soldered to the panel , wondering if i could maybe cut some traces on the right ribbon and maybe get some kind of full picture? hmm , any thoughts?
    Also when i connect the right ribbon , the voltages on the tcon board dissapear , the ribbon cable is not shorted

    The TV is LG 43UM7100PLB , no service manual or any info online
    Last edited by sigmeyer; 09-09-2021, 10:35 AM.
    Tags: None
    • vinceroger69
      Badcaps Legend
      • Mar 2012
      • 6714
      • uk
      #2
      Re: 43UM7100PLB, no picture but have half picture when i disconnect 1 side of panel

      This could be a shorted smd capacitor on the lcd panel pcb

        Comment

        • sigmeyer
          Senior Member
          • Feb 2020
          • 147
          • Serbia
          #3
          Re: 43UM7100PLB, no picture but have half picture when i disconnect 1 side of panel

          Ye i was thinking more in the realm of a shorted IC , but ye exactly my thinking. Ill have to strip down the plastic tomorrow so i can access it , ill post some pictures , maybe i can repair it

            Comment

            • sigmeyer
              Senior Member
              • Feb 2020
              • 147
              • Serbia
              #4
              Re: 43UM7100PLB, no picture but have half picture when i disconnect 1 side of panel

              https://monitor.net.ru/forum/attachments/63292/ I was too curious so i checked it right now , no shorts on the panel board, then i started looking on he motherboard , because there might be an issue. My attention was drawn to the chip next to the capacitor where i got the 32v that dissapears . The chip is SW52212 , and online i found a russian forum where they talked about what it seemed like exact same problem. They gave up and said it was probably a short on the glass , which i cant really believe that. Here is a picture that they posted , i recon this chip is at fault ... no way to test really without schematic and the thing shutting itself down anyway.

                Comment

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