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Acer Extensa 5430 Dead Board

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    #1

    Acer Extensa 5430 Dead Board

    Hello,
    I got this notebook for repair.
    Notebook powers on when i connect power supply and cannot turn off.
    On battery it can be powered on, but not off.
    When its powered on, only leds shinning, but LCD not working.
    I find on board burned SMD transistor U42.
    Thanks for any help.
    Tags: None
    #2
    Re: Acer Extensa 5430 Dead Board

    a schematic would help
    these might be it

    hi res pics of the mobo would help aswell
    Attached Files
    Last edited by drdyzio; 05-15-2014, 04:01 PM.

    Comment

      #3
      Re: Acer Extensa 5430 Dead Board

      How many pins on U42? Any markings - printings on the board which will help us on the board you have?

      Comment

        #4
        Re: Acer Extensa 5430 Dead Board

        Originally posted by drdyzio View Post
        a schematic would help
        these might be it

        hi res pics of the mobo would help aswell
        Hello, here is photos of the board and detail of U42.
        Attached Files
        Last edited by Honziq; 05-19-2014, 03:22 AM.

        Comment

          #5
          Re: Acer Extensa 5430 Dead Board

          Originally posted by atsio View Post
          How many pins on U42? Any markings - printings on the board which will help us on the board you have?
          U42 Have 3 pins, i think it is transistor.

          Comment

            #6
            Re: Acer Extensa 5430 Dead Board

            Originally posted by atsio View Post
            How many pins on U42? Any markings - printings on the board which will help us on the board you have?
            On this schematic i find it is mosfet.
            On page 47 you can see it.
            Attached Files

            Comment

              #7
              Re: Acer Extensa 5430 Dead Board

              U42 is an APM2300AAC n-channel fet. Check voltage on all pins after pressing power button to determine if fet is bad.
              Last edited by atsio; 05-19-2014, 03:32 AM.

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                #8
                Re: Acer Extensa 5430 Dead Board

                Some one has heated up the gpu from what I can see in the pictures bad news.

                Comment

                  #9
                  Re: Acer Extensa 5430 Dead Board

                  Originally posted by atsio View Post
                  U42 is an APM2300AAC n-channel fet. Check voltage on all pins after pressing power button to determine if fet is bad.
                  On G is 4,52V
                  ON S is 0,35V.
                  ON D is 1,75V.

                  It is very hot and making little smoke when is powered on.
                  On battery I can turn on the laptop, but not turn off.
                  On AC power supply is turning on automatically, when i connect power.

                  Comment

                    #10
                    Re: Acer Extensa 5430 Dead Board

                    Originally posted by cyberhack View Post
                    Some one has heated up the gpu from what I can see in the pictures bad news.
                    And is this the problem?
                    Is the mosfet connected to the GPU?

                    Comment

                      #11
                      Re: Acer Extensa 5430 Dead Board

                      Replace it and check KBC

                      Comment

                        #12
                        Re: Acer Extensa 5430 Dead Board

                        kbc is turning out to a stock fault

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