ACER 8930g no picture

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  • lefos
    Badcaps Veteran
    • Nov 2013
    • 321
    • Greece
    #1

    ACER 8930g no picture

    Hello everybody,

    Need your help with this one. I received it with problem no picture. Indeed it didn't have picture on the panel but on external monitor it had picture with vertical lines. I changed the chipset of the vga card and now I have backlight, I can see that the lcd is trying to produce picture but with no result. On external monitor I have perfect picture now. I have managed to do a BIOS update from windows so the device is booting normally. Any ideas why it doesn't have picture? On the panel's connector I have all the voltages according to its schematic.
    Any help will be great.
    Tags: None
    • lefos
      Badcaps Veteran
      • Nov 2013
      • 321
      • Greece
      #2
      Re: ACER 8930g no picture

      Forgot to mention that the motherboard has a nec tokin super capacitor but I doubt the problem is from this one.

        Comment

        • dj_ricoh
          Badcaps Legend
          • Jan 2013
          • 2073
          • uk
          #3
          Re: ACER 8930g no picture

          but when you preheated the board for changing the chip maybe it when tits UP
          Just cook it! It's already broken.

            Comment

            • lefos
              Badcaps Veteran
              • Nov 2013
              • 321
              • Greece
              #4
              Re: ACER 8930g no picture

              It has a separate small board for the vga that's why I think that the problem is located on the main board.

                Comment

                • atsio
                  Badcaps Veteran
                  • Oct 2013
                  • 819
                  • Greece
                  #5
                  Re: ACER 8930g no picture

                  Originally posted by lefos
                  On the panel's connector I have all the voltages according to its schematic.
                  Any help will be great.
                  Which voltages do you have?
                  What is the version of your board?

                    Comment

                    • lefos
                      Badcaps Veteran
                      • Nov 2013
                      • 321
                      • Greece
                      #6
                      Re: ACER 8930g no picture

                      The panel is LTN184HT01-A02 and on its connector I can measure the power voltages from the datasheet.
                      The board is 6050A2251701-MB-A02

                        Comment

                        • atsio
                          Badcaps Veteran
                          • Oct 2013
                          • 819
                          • Greece
                          #7
                          Re: ACER 8930g no picture

                          Do you have any voltage on the data signals?

                            Comment

                            • lefos
                              Badcaps Veteran
                              • Nov 2013
                              • 321
                              • Greece
                              #8
                              Re: ACER 8930g no picture

                              Do you want on any pin specifically?
                              Because it is a little pain to open again the panel.
                              Thanks

                                Comment

                                • atsio
                                  Badcaps Veteran
                                  • Oct 2013
                                  • 819
                                  • Greece
                                  #9
                                  Re: ACER 8930g no picture

                                  You can check on pins 12,14,15,17,18,20,21,23,24,26,27,29,30,32,33,35,36 of the LVDS connector on the board

                                    Comment

                                    • lefos
                                      Badcaps Veteran
                                      • Nov 2013
                                      • 321
                                      • Greece
                                      #10
                                      Re: ACER 8930g no picture

                                      Guys thanks a lot for you help. Took some closer look on the vga board and found out that on one transistor's pin the pad was broken. Rebuilt the line and now works like a charm!

                                        Comment

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