Help with 26LG30-UA

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  • ragingfish
    Member
    • Dec 2012
    • 20
    • US

    #21
    Re: Help with 26LG30-UA

    See voltages below:

    Originally posted by budm
    OK, you will need to check the voltages at the test points on the T-CON board. If you look real close at the board, you will see exposed round copper pads with white circles.
    Please check these points:
    V3D3 3.295
    V1D8 1.792
    VGL -5.96 (polarity appears to change here)
    AVDD 12.68
    VGH 24.36
    VGHC 23.38

    And also the readings on all 3 pins of U200. 1.792, 0.002, 3.297
    The T-CON is about $40.
    Last edited by ragingfish; 01-19-2013, 04:09 PM.

    Comment

    • ragingfish
      Member
      • Dec 2012
      • 20
      • US

      #22
      Re: Help with 26LG30-UA

      How do those voltages look? Anything off? Is that polarity change a red flag or is that normal?

      Thanks!

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Help with 26LG30-UA

        Didn't notice this post. Those voltages look fine to me. I doubt they would cause the issue.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • ragingfish
          Member
          • Dec 2012
          • 20
          • US

          #24
          Re: Help with 26LG30-UA

          Ok, so if the t-con looks ok, what's the next logical thing to look at

          Comment

          • ragingfish
            Member
            • Dec 2012
            • 20
            • US

            #25
            Re: Help with 26LG30-UA

            anyone have any more thoughts?

            Comment

            • kevinm34232
              Badcaps Legend
              • May 2012
              • 1884
              • USA

              #26
              Re: Help with 26LG30-UA

              I had this same model with a video issue that got better with the TV being on for awhile, determined it was the main board but never tried reflowing it, I think that may be the case here.

              Never tried the oven thing because I didn't know about it, Tom can tell you how to do it..

              Comment

              • ragingfish
                Member
                • Dec 2012
                • 20
                • US

                #27
                Re: Help with 26LG30-UA

                Interesting thought. I haven't tried just letting it sit on for a while.

                I'm all for reflowing the boards even just as a "what the hell" possibility.

                In this case, which one is the "main" board you refer to? Is that the power supply? The t-con? The one with the tuner and video inputs? or the one which i'm speculating has to do with power inversion for the display?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #28
                  Re: Help with 26LG30-UA

                  Main board is the one with video inputs on it.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                  • ragingfish
                    Member
                    • Dec 2012
                    • 20
                    • US

                    #29
                    Re: Help with 26LG30-UA

                    Thanks! I'll pick up a cheap heat gun and try reflowing...

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: Help with 26LG30-UA

                      Reflow is best done in an oven. The one used to cook chips and pizza on a late student night.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment

                      • ragingfish
                        Member
                        • Dec 2012
                        • 20
                        • US

                        #31
                        Re: Help with 26LG30-UA

                        i considered that, but i hate to fill up my nice food oven with all that nasty off-gassing and toxic chemicals and whatnot...

                        Comment

                        • ragingfish
                          Member
                          • Dec 2012
                          • 20
                          • US

                          #32
                          Re: Help with 26LG30-UA

                          not to mention fear of melting things! lol has anyone ever successfully reflowed in a toaster oven?

                          Comment

                          • ragingfish
                            Member
                            • Dec 2012
                            • 20
                            • US

                            #33
                            Re: Help with 26LG30-UA

                            Well, in a desperate attempt to avoid a reflow, I replaced the t-con. Sure enough, the unit starts right up!

                            Thank you everyone for your help!!!

                            Comment

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