Sharp LC-42D62U Main Board repair - help!

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  • XmouseX
    Senior Member
    • Aug 2011
    • 158
    • US
    #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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    • XmouseX
      Senior Member
      • Aug 2011
      • 158
      • US
      #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.

        Comment

        • addytzu123
          Senior Member
          • Mar 2013
          • 54
          • ROMANIA
          #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.

            Comment

            • Mt.Man
              Senior Member
              • Jun 2012
              • 53
              • USA
              #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.

                Comment

                • XmouseX
                  Senior Member
                  • Aug 2011
                  • 158
                  • US
                  #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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