Asus K56CB-XO488H not detect Nvidia GT740M

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  • Gripen
    Member
    • Sep 2020
    • 37
    • Slovakia
    #1

    Asus K56CB-XO488H not detect Nvidia GT740M

    Hello.
    I got a faulty Asus K56CB-XO488H laptop that did not turn on. The problem was the BIOS. On this forum I got a BIOS dump which I flashed to new chip.

    The laptop is working now. There is only one problem with it. The laptop has Intel HD 4000 and Nvidia GT740m. Only the Intel HD 4000 appears in Device Manager. There is no setting in the BIOS to disable it. I also tried updating the BIOS, it didn't help. The Nvidia Chip doesn't even heat up.

    Could it have to do with having a bios dump from the forum and not the original? Or need to look for the fault elsewhere?
    Tags: None
    • stingerchamp
      Badcaps Veteran
      • Sep 2020
      • 425
      • Pakistan
      #2
      Re: Asus K56CB-XO488H not detect Nvidia GT740M

      Uma bios yes

        Comment

        • Gripen
          Member
          • Sep 2020
          • 37
          • Slovakia
          #3
          Re: Asus K56CB-XO488H not detect Nvidia GT740M

          Originally posted by stingerchamp
          Uma bios yes
          Do you know a bios dump that would be good for me to this?

            Comment

            • piernov
              Super Moderator
              • Jan 2016
              • 4435
              • France
              #4
              Re: Asus K56CB-XO488H not detect Nvidia GT740M

              BIOS requests go into the BIOS request section.
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                • caspian
                  Badcaps Legend
                  • Oct 2015
                  • 1589
                  • Laptop
                  #5
                  Re: Asus K56CB-XO488H not detect Nvidia GT740M

                  https://www.badcaps.net/forum/showthread.php?t=91747
                  Last edited by caspian; 01-04-2021, 12:59 PM.

                    Comment

                    • Gripen
                      Member
                      • Sep 2020
                      • 37
                      • Slovakia
                      #6
                      Re: Asus K56CB-XO488H not detect Nvidia GT740M

                      Originally posted by piernov
                      BIOS requests go into the BIOS request section.
                      I had an old post about this laptop there(when not power on due to bios), I also wrote there with this problem but I didn't get an answer to the graphics problem. I also wrote here because I wasn't sure this was a BIOS problem.

                      Originally posted by caspian
                      https://www.badcaps.net/forum/showthread.php?t=91747
                      If I have the BIOS flasher here, I'll give it a try. Thank you!

                        Comment

                        • Gripen
                          Member
                          • Sep 2020
                          • 37
                          • Slovakia
                          #7
                          Re: Asus K56CB-XO488H not detect Nvidia GT740M

                          Originally posted by caspian
                          https://www.badcaps.net/forum/showthread.php?t=91747
                          I tried it but it still doesn't work.

                            Comment

                            • Sametbey
                              Badcaps Veteran
                              • Jan 2021
                              • 229
                              • Turkey
                              #8
                              Re: Asus K56CB-XO488H not detect Nvidia GT740M

                              Could there be a similar problem? Lenovo U510 LA-8972P. Despite the display screen, the video card is not seen in the device management, PU801 GPU power control RT8813A chip no + 5v at 21 pin, 2.2 ohm protection resistor open circuit. The chip was replaced and the problem was resolved. Check the VGA_GPU voltages.

                              Last edited by Sametbey; 01-09-2021, 08:48 AM. Reason: picture added
                              I'm not happy to be so strong. because it's not humanly

                                Comment

                                • Gripen
                                  Member
                                  • Sep 2020
                                  • 37
                                  • Slovakia
                                  #9
                                  Re: Asus K56CB-XO488H not detect Nvidia GT740M

                                  I'm still a beginner in these so I don't really know what to look for.
                                  There is a mosfet (Nikos P1203BV) between the processor and the NVIDIA chip. I noticed that the Drain pin is 1.05V, but the Source and Gate pin are 0V. Could this be a problem?
                                  Attached Files

                                    Comment

                                    • Gripen
                                      Member
                                      • Sep 2020
                                      • 37
                                      • Slovakia
                                      #10
                                      Re: Asus K56CB-XO488H not detect Nvidia GT740M

                                      I just noticed that a capacitor and a diode(maybe) on the other side has burned.
                                      Attached Files
                                      Last edited by Gripen; 01-11-2021, 11:11 AM.

                                        Comment

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