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Sharp LC-42D62U Main Board repair - help!

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    #1

    Sharp LC-42D62U Main Board repair - help!

    Hello. I am working on a Sharp LC-42D62U. I think I have narrowed it down to a main board problem, but because of my lack of funds, I would like to see if I could repair the board. I was wondering what part of the main board might be causing the distorted picture I have. It seems like RAM or something. Please any help would be appreciated. Thanks!
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    #2
    Re: Sharp LC-42D62U Main Board repair - help!

    Also I forgot to mention, when I put pressure on the heatsink(on the main board), I can make the picture better or worse.

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      #3
      Re: Sharp LC-42D62U Main Board repair - help!

      Hi, with the last mention lies a clue to what may be wrong here, and it points to bad contacts on the board. Try to look with a magnifying glass on the board, and search for fine cracks, bad solder joints.
      I see multiple chips BGA mounted on the motherboard and one of them may have develop a dry contact. If the possibility exists, try to reflow first the board, on a specialised laptop service.
      All the best!
      In a transistor circuit protected by a fuse, the transistor will always blow to protect the fuse.

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        #4
        Re: Sharp LC-42D62U Main Board repair - help!

        The equipment required to reflow the BGA IC will cost way more than another main board. Check ebay or shopjimmy for a board.

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          #5
          Re: Sharp LC-42D62U Main Board repair - help!

          I have a reball/reflow station....I just wanted to be sure it was the chip on the main board that would cause that.

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