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LG 65UQ7050ZUD No Picture Backlight On

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    #1

    LG 65UQ7050ZUD No Picture Backlight On

    Hey everyone, I have an LG 65uq7050zud with a black picture but backlight is on. I tested the measurements from the PSU and they check out. I can't find any service manual so I'm suspecting the main board. Any advice before I replace the board? Found them for around $60
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    #2
    Just with experience I would be suspect of the panel. Did you try disc each side of ribbon cable to get 1/2 or 3/4 picture yet? Or tape any of the ribbon pins just to test to see? Alot of lgs I get in America are bad because of panel issues with same symptoms you talk about.

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      #3
      Originally posted by EazyBone View Post
      Just with experience I would be suspect of the panel. Did you try disc each side of ribbon cable to get 1/2 or 3/4 picture yet? Or tape any of the ribbon pins just to test to see? Alot of lgs I get in America are bad because of panel issues with same symptoms you talk about.
      I checked the panel by removing the left and right side ribbon and still didn't get a picture. I'm also not getting any audio. A weird thing I notice is when I turn the tv off I hear a clicking sound coming from the main board. Near the main IC. I uploaded a video of it.
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        #4
        Just removing each side doesn't necessarily work sometimes, continue on with tape on both sides covering like 10 pins at a time. Take a couple minutes and check that.

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          #5
          SHORT OR CUT of VCC 3 V ON PANEL BOARDS

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            #6
            Originally posted by EazyBone View Post
            Just removing each side doesn't necessarily work sometimes, continue on with tape on both sides covering like 10 pins at a time. Take a couple minutes and check that.
            I'll do the tape tonight!

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              #7
              Originally posted by EazyBone View Post
              Just removing each side doesn't necessarily work sometimes, continue on with tape on both sides covering like 10 pins at a time. Take a couple minutes and check that.
              So I looked at where the diodes are on the board and noticed ribbon 1 has them all. I placed tape on maybe 10-15 just to give it a shot and the picture is perfect. I'm kinda confused because I read how this should degrade the picture or lose potential colors?

              Should I just leave it and call it fixed until it fails?
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                #8
                If you go YouTube and watch screen test video ( type that) and look and see if there is lines or discoloration. But probably panel is shorted somehow.

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                  #9
                  Originally posted by EazyBone View Post
                  If you go YouTube and watch screen test video ( type that) and look and see if there is lines or discoloration. But probably panel is shorted somehow.
                  So it seems I am missing some horizontal lines. Should I start trimming the tape to see how good I can get it?
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                    #10
                    Up to you. But hey, saved ya $60 lol.

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                      #11
                      Originally posted by EazyBone View Post
                      Up to you. But hey, saved ya $60 lol.
                      Haha exactly. I put it back together and called it a day. How long do you think it will last?

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                        #12
                        You never know. My guess is 6mo

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