Un70TU7000b Backlights work, no picture, has sound, panel shorted caps

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  • EazyBone
    Badcaps Legend
    • Jun 2023
    • 1306
    • United states

    #1

    Un70TU7000b Backlights work, no picture, has sound, panel shorted caps


    Picked up this Samsung above thinking it'd be backlights but it isn't. Now MAYBE I'll get lucky.
    Found some shorted caps among the panel boards. Each cap along the line is shorted. On every board (3 panel driver boards)I disconnect each side right and left ribbons and they are no longer shorted caps and have about 1.5Mohm resistance (on left and right boards). The middle board has the main board disconnected and the caps are shorted. Last 4 pics show arrow to caps.

    Now what exactly do I need to do in order to attempt to fix this issue?

    do I have to take each one off until the short is stopped? I would assume you test each ones resistance once off. Is there an easier way.

    Never actually found a short before on a panel so guidance would be appreciated. Or any experience with this
    Last edited by EazyBone; 12-24-2023, 07:02 PM.
  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12087
    • U.S.

    #2
    Sometimes you can luck out and see a hairline crack on cap, look with magnifier if you can, there's some other ways but removing one at a time is not really that hard.

    Comment

    • EazyBone
      Badcaps Legend
      • Jun 2023
      • 1306
      • United states

      #3
      I found the shorted cap, first one. Replaced it and no more short. Short was gone before I replaced it also just from the pads. Yet no dice. No picture still. Same caps only getting .013v along the whole line.

      Comment

      • EazyBone
        Badcaps Legend
        • Jun 2023
        • 1306
        • United states

        #4
        This chip getting voltages of

        Top left down
        .006 (where the number 5 is)
        .006
        .533 fluctuating to .719 and back down repeatedly
        .367 fluctuating to .552and back down.

        Top right down
        Ground 0
        .181
        .295 fluctuating.384
        3.324 fluctuating very slightly 3.327

        All fluctuating is about every 1 seconds goes back and forth.

        any other suggestions or knowledge

        Comment

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