lg 47le7900 main board

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  • thuss
    Badcaps Veteran
    • Jul 2012
    • 321
    • uk
    #1

    lg 47le7900 main board

    Hi

    My tv comes on the menu displays etc . But when I connect the hdmi cable or the scart the tv display states no signal.

    When I do connect the scart from the dvd player I get sound but no picture(but I do get the lg logos stating no signal).

    Has anyone come across this problem before, before I change the main board I was hoping to fix the main board?

    thanks in advance
    Tags: None
    • thuss
      Badcaps Veteran
      • Jul 2012
      • 321
      • uk
      #2
      Re: lg 47le7900 main board

      working I just reflowed the main chip

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12206
          • U.S.
          #3
          Re: lg 47le7900 main board

          Originally posted by thuss
          working I just reflowed the main chip
          have a jvc doing same thing, which main chip, where was it located?, wondering if my problem is the same, glad you sorted it out, thanks.
          Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.

            Comment

            • thuss
              Badcaps Veteran
              • Jul 2012
              • 321
              • uk
              #4
              Re: lg 47le7900 main board

              its on the main board, I simply followed the prints from all the hdmis usbs etc and they all went into a main chip. hope that helps

                Comment

                • Azim69
                  New Member
                  • Nov 2016
                  • 1
                  • United Kingdom
                  #5
                  Re: lg 47le7900 main board

                  Hey Guys.

                  Can you please give me instruction step by step how to do it?

                  Thank you in advance.

                    Comment

                    • diif
                      Badcaps Legend
                      • Feb 2014
                      • 6978
                      • England
                      #6
                      Re: lg 47le7900 main board

                      Originally posted by Azim69
                      Hey Guys.

                      Can you please give me instruction step by step how to do it?

                      Thank you in advance.
                      You are aiming to heat the solder balls that connect the chip to the board in a controlled manner up to around 230c to get them to melt and remake any broken connections. There are many videos on YouTube to give you an idea of the different ways to achieve this, from shop a bought BGA rework station to home made stuff and there is at least one member that uses a gas stove to reflow.
                      I spent many hours with a friend setting up my station, then many more hours practising on scrap boards. It is not a job I would do with no experience.
                      What's your skill set and what tools do you have ?

                        Comment

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