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65UJ654T Backlight but no image

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    #1

    65UJ654T Backlight but no image

    As titled, just backlight and sound on.

    I disconnect right side TCON LVDS and half screen is white other half just blank. If I reconnect it and disconnect other LVDS whole screen is blank like how I started. Does this mean bad panel?
    Tags: None
    #2
    Re: 65UJ654T Backlight but no image

    I added pics and took some reading from test points on TCON

    When right side LVDS connected I get
    VIN 13v
    VCC 0.8v
    VGH 0v


    With just left side or no LVDS cables connected
    VIN 13v
    VCC 3.3v
    VGH 28v

    Either way I still get no image on screen. How do I differentiate between bad panel or bad TCON?
    Attached Files
    Last edited by nubinator; 05-05-2022, 05:30 AM.

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      #3
      Re: 65UJ654T Backlight but no image

      try the tape cut-off method.

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        #4
        Re: 65UJ654T Backlight but no image

        I tried but always getting low voltages on TCON when right cable connected. I then looked at the panel boards and getting shorts on some of the caps on right side and none on the left. Could bad capacitors be the problem or this just indicative of bad panel? I highlighted the shorted caps in the pics
        Attached Files
        Last edited by nubinator; 05-05-2022, 10:49 PM.

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          #5
          Re: 65UJ654T Backlight but no image

          If neither side is providing an image, it is worth trying to replace the tcon board. Maybe find a seller that takes returns.

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            #6
            Re: 65UJ654T Backlight but no image

            wow I took the 4 caps off the panel board that were showing short I tried without replacing them and now i got full display and seems to be working fine? what do those caps do? it was only c320 that was actually bad and i ripped up a couple of pads trying to desolder the little things

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              #7
              Re: 65UJ654T Backlight but no image

              ok, if short is gone, then it was just a bad cap, I should have said check the caps first. I would replace the bad cap. Maybe look on youtube for pad repair or a similar solution.

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                #8
                Re: 65UJ654T Backlight but no image

                https://www.youtube.com/watch?v=xty1G5UBYb0

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                  #9
                  Re: 65UJ654T Backlight but no image

                  https://www.youtube.com/watch?v=SaBwdJLFVPU

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                    #10
                    Re: 65UJ654T Backlight but no image

                    Thanks luckily It was only ground pads I lifted so was able to just bridge to adjacent cap.

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                      #11
                      Re: 65UJ654T Backlight but no image

                      ok,

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