Lenovo G40-70 backlight no image

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  • maurovalero
    Senior Member
    • Sep 2018
    • 69
    • colombia
    #1

    Lenovo G40-70 backlight no image

    Hello, my laptop turns on and it has backlight but it shows nothing
    board aclu 1/2 uma nma272
    i did replace the memory ram, change the socket, probe new ram.
    Tags: None
    • Jesse James
      Senior Member
      • Sep 2018
      • 95
      • Canada
      #2
      Re: Lenovo G40-70 backlight no image

      Check connector to screen is secure

        Comment

        • ktmmotocross
          Boardkiller
          • Feb 2014
          • 3577
          • slovakia
          #3
          Re: Lenovo G40-70 backlight no image

          image on external display?

            Comment

            • JaroTech
              Badcaps Veteran
              • Mar 2015
              • 351
              • Canada
              #4
              Re: Lenovo G40-70 backlight no image

              Hi, if you have a white screen, then what voltage do you have on pin 21 of the screen connector (JEDP1) on the motherboard, you should have 3.3 VDC?

                Comment

                • ktmmotocross
                  Boardkiller
                  • Feb 2014
                  • 3577
                  • slovakia
                  #5
                  Re: Lenovo G40-70 backlight no image

                  Originally posted by JaroTech
                  Hi, if you have a white screen, then what voltage do you have on pin 21 of the screen connector (JEDP1) on the motherboard, you should have 3.3 VDC?
                  he didnt wrote white display

                    Comment

                    • taroo
                      Member
                      • Sep 2021
                      • 16
                      • myanmar
                      #6
                      Re: Lenovo G40-70 backlight no image

                      Originally posted by ktmmotocross
                      he didnt wrote white display
                      I have same problem

                      pin 21 3.3V OK please advice

                        Comment

                        • taroo
                          Member
                          • Sep 2021
                          • 16
                          • myanmar
                          #7
                          Re: Lenovo G40-70 backlight no image

                          Originally posted by ktmmotocross
                          he didnt wrote white display
                          White Screen Appear
                          Attached Files

                            Comment

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