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Asus X555L backlight shuts off when on battery

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    Asus X555L backlight shuts off when on battery

    Good day folks. Very strange issue I've got with an Asus lappy here. I haven't heard or seen something similar before so it's very difficult to track down.

    Here goes: when I got it, the battery was bulged on the inside of it. It was pushing against the touchpad, so that's the initial issue the owner reported, as they had no idea the battery was causing the back-pressure. I took it apart, removed the blown battery and left it without one since it runs just fine on the AC adapter alone. Meanwhile, the chaps said they'd like a new battery put it after I told them it's blown, so fair enough, they pay me, I order it up and after a long wait the battery turns up.

    I install it and try powering up the thing. It does come on, but now there's no backlight...as soon as I plug the AC adapter in, the backlight instantly comes on...can't remember if the bulged battery did this. I can't recall if it had any bit of life left in it and turned on at all.

    Something's very wrong inside, so now I'm kinda stuck with a fairly expensive battery and a laptop I can't charge money for.....the schematic isn't very helpful because like most laptops, the PCB isn't marked, so I have no idea where to look first or what's causing the issue...I get 19v on pin 1 of the LVDS cable when plugged in and the backlight is on, which indeed goes away when I pull out the cord and it fluctuates 1-3v...the laptop keeps on going just fine, but the backlight doesn't switch over. The only schematic I found is this one, though I'm not sure it's for the proper board, since it's not mentioned anywhere. Just in case someone has a brainy idea or has encountered this before....again, very difficult. I can provide pictures if need be. Cheers and thanks.
    Wattevah...

    #2
    Re: Asus X555L backlight shuts off when on battery

    I think i have a boardview for that. I'll check it a bit later and get back to you.
    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!

    Comment


      #3
      Re: Asus X555L backlight shuts off when on battery

      Thanks mate.
      Wattevah...

      Comment


        #4
        Re: Asus X555L backlight shuts off when on battery

        Hi
        See if its help
        Attached Files

        Comment


          #5
          Re: Asus X555L backlight shuts off when on battery

          Ugggh dumb question: how do you open those ? Haven't used board views before. Thanks.
          Wattevah...

          Comment


            #6
            Re: Asus X555L backlight shuts off when on battery

            Originally posted by Dannyx View Post
            Ugggh dumb question: how do you open those ? Haven't used board views before. Thanks.
            This is what i use
            https://openboardview.org/

            Comment


              #7
              Re: Asus X555L backlight shuts off when on battery

              Thanks for the input so far, but it looks like this is going to be a mental exercise trying to figure out what went wrong rather than a hands-on approach trying to fix the thing, because I already closed the laptop and am underway to returning the battery which the seller luckily agreed to take back. Let's see...
              Wattevah...

              Comment


                #8
                Re: Asus X555L backlight shuts off when on battery

                The software won't install I'm afraid....just says has stopped working when I try running the installer...
                Wattevah...

                Comment


                  #9
                  Re: Asus X555L backlight shuts off when on battery

                  This is the same software i use on windows 10 laptop its also what louis rossmann uses on his you tube videos so should work fine i will remove and re install it on this laptop and give it a try

                  Edit yes works fine using windows 10
                  Last edited by vinceroger69; 03-28-2018, 04:37 AM.

                  Comment


                    #10
                    Re: Asus X555L backlight shuts off when on battery

                    I'm on win7 and I managed to find an alternative simply called boardviewer...I can open those files and located the connector for the panel and whatnot, but I must admit I'm not sure how such a boardviewer works. From what I understand, when I click on a pin, it highlights all other pins connected to it. In this case, I'm looking at the pins 38-40 of J4502, just so we're on the same page and they seem to be connected to AC BAT SYS. Upon clicking on the pins it shows me what else goes to those pins as well. Strange how it dies when you pull out the plug...
                    Wattevah...

                    Comment


                      #11
                      Re: Asus X555L backlight shuts off when on battery

                      Originally posted by Dannyx View Post
                      Ugggh dumb question: how do you open those ? Haven't used board views before. Thanks.
                      try this program bro
                      Attached Files

                      Comment


                        #12
                        Re: Asus X555L backlight shuts off when on battery

                        Can you please reupload the schematic ? I grabbed it at work and worked perfectly, but now it's telling me the archive is damaged...
                        Wattevah...

                        Comment


                          #13
                          Re: Asus X555L backlight shuts off when on battery

                          could it be a software problem ? power settings gone wrong somehow

                          Comment


                            #14
                            Re: Asus X555L backlight shuts off when on battery

                            I doubt it, because AC_BAT_SYS 19v, present on pins 38-40 of the LVDS connector I mentioned, disappears when the AC adapter is pulled out. That seems to be the only "power" going into the display connector. It's not a control signal that cuts out - it's the supply itself that seems to die. Strange how nothing else dies...
                            Wattevah...

                            Comment


                              #15
                              Re: Asus X555L backlight shuts off when on battery

                              Originally posted by Dannyx View Post
                              Can you please reupload the schematic ? I grabbed it at work and worked perfectly, but now it's telling me the archive is damaged...
                              hopefully this will work
                              Attached Files

                              Comment


                                #16
                                Re: Asus X555L backlight shuts off when on battery

                                Yes it does. Thanks
                                Wattevah...

                                Comment


                                  #17
                                  Re: Asus X555L backlight shuts off when on battery

                                  hello
                                  i have same problem did you fix it ?
                                  have you got the board schematics ???

                                  thank you

                                  Comment


                                    #18
                                    Re: Asus X555L backlight shuts off when on battery

                                    Originally posted by shuky View Post
                                    hello
                                    i have same problem did you fix it ?
                                    have you got the board schematics ???

                                    thank you
                                    There is only a repair guide, and the boardview is already posted .
                                    Attached Files
                                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                    Comment


                                      #19
                                      Re: Asus X555L backlight shuts off when on battery

                                      thank you . but its only sample diagram

                                      Comment


                                        #20
                                        Re: Asus X555L backlight shuts off when on battery

                                        Originally posted by shuky View Post
                                        thank you . but its only sample diagram
                                        There is no schematic, just the Repair Guide with test points. The boardview is already posted.
                                        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                        Comment

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