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lenovo g580 red back lcd

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    #1

    lenovo g580 red back lcd

    problem RED back lcd color>>>>

    I changed (lvds) and lcd screen but the problem remained
    Attached Files
    Last edited by salmanzeiad; 09-12-2021, 08:06 AM.
    Tags: None
    #2
    Re: lenovo g580 red back lcd

    I once faced such an issue with dell n5010 mb. Ultimately, had to replace the pch to solve it. may not be the case here.

    Comment

      #3
      Re: lenovo g580 red back lcd

      Originally posted by mcplslg123 View Post
      I once faced such an issue with dell n5010 mb. Ultimately, had to replace the pch to solve it. may not be the case here.

      what r u meaning (pch)

      R u meaning Main Chip //Platform Controller Hub
      Last edited by salmanzeiad; 09-13-2021, 02:56 AM.

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        #4
        Re: lenovo g580 red back lcd

        Check lvds socket on main board, maybe you have bent pins?
        Originally posted by PeteS in CA
        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
        A working TV? How boring!

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          #5
          Re: lenovo g580 red back lcd

          Originally posted by Th3_uN1Qu3 View Post
          Check lvds socket on main board, maybe you have bent pins?
          I checked and there is no problem...

          Comment

            #6
            Re: lenovo g580 red back lcd

            Looks like an incompatible panel?
            Last edited by SMDFlea; 09-17-2021, 11:24 AM.

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              #7
              Re: lenovo g580 red back lcd

              Picture on external monitor is OK ?

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                #8
                Re: lenovo g580 red back lcd

                Originally posted by lefos View Post
                Picture on external monitor is OK ?

                yes

                Comment

                  #9
                  Re: lenovo g580 red back lcd

                  Originally posted by salmanzeiad View Post
                  problem RED back lcd color>>>>

                  I changed (lvds) and lcd screen but the problem remained
                  whats the motherboard part number and the panel part number
                  All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

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                    #10
                    Re: lenovo g580 red back lcd

                    Originally posted by smdflea View Post
                    whats the motherboard part number and the panel part number
                    la-7982p
                    rev:1.0

                    lenovo g580
                    m#20150

                    Comment

                      #11
                      Re: lenovo g580 red back lcd

                      Originally posted by salmanzeiad View Post
                      la-7982p
                      rev:1.0

                      lenovo g580
                      m#20150
                      what is the lcd panel part number such as LP156WH2 (TL)(Q1) LP156WH2 (TL)(Q2) LP156WH2 (TL)(QB) LP156WH4 (TL)(A1)
                      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

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                        #12
                        Re: lenovo g580 red back lcd

                        Originally posted by SMDFlea View Post
                        what is the lcd panel part number such as LP156WH2 (TL)(Q1) LP156WH2 (TL)(Q2) LP156WH2 (TL)(QB) LP156WH4 (TL)(A1)
                        n156b6-l04

                        Comment

                          #13
                          Re: lenovo g580 red back lcd

                          Did a quick search and the LCD Panel model seems compatible.
                          Image on external screen through VGA connector is OK? (I know you tested external screen but do not know if HDMI or other output)
                          Last edited by electrocute; 09-20-2021, 08:05 AM.

                          Comment

                            #14
                            Re: lenovo g580 red back lcd

                            Originally posted by electrocute View Post
                            (I know you tested external screen but do not know if HDMI or other output)
                            what`s will change if image vga ok!! more explain plz....going in my mind may be super i-o problem or one part problem in it...

                            what`s your opinion?

                            Comment

                              #15
                              Re: lenovo g580 red back lcd

                              Originally posted by salmanzeiad View Post
                              what`s will change if image vga ok!! more explain plz....going in my mind may be super i-o problem or one part problem in it...
                              Probably nothing will change. Was curious about it as the colors are clearly divided on the VGA and though that maybe they were shorted on the PCH, but this is probably a misconception on my part due to my limited knowledge on the subject.

                              If the screen panel, the LVDS connector and the cable are good then I'd rather think it is the PCH.

                              If I'm not mistaken the color behavior can be related to the LVDS data signals:
                              LVDS_A0#
                              LVDS_A1#
                              LVDS_A2#
                              LVDS_A0
                              LVDS_A1
                              LVDS_A2

                              Some measurements can be done on them (pin 13 to 18, on the LVDS connector on the board) with a multi-meter on diode mode to measure resistance to ground, and with and oscilloscope to read and compare the positive/negative signals of the three data line pairs: a significant difference on a data line could indicate a problem. As they connect directly to the PCH that's probably the culprit.

                              Some more seasoned members could have a better explanation for it and correct me where I am wrong. Learning is a long journey.
                              Attached Files
                              Last edited by electrocute; 09-21-2021, 05:29 PM.

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