Asus X455L Short Mosfet

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  • dqtech
    Badcaps
    • Jul 2018
    • 630
    • N/A
    #1

    Asus X455L Short Mosfet

    I got this laptop from friend with problem short 19v....when i check this 2 mosfet getting short...i remove that mosfet and confirm that mosfet is short...



    and check that 2 capacitor PC9009 and PC9004 pad is also short...already check where that capacitor goes and came from but cannot find the main problem...please help

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    • dqtech
      Badcaps
      • Jul 2018
      • 630
      • N/A
      #2
      Re: Asus X455L Short Mosfet

      already remove charging ic PU9001 but that capacitor still short

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14190
          • Canada
          #3
          Re: Asus X455L Short Mosfet

          Remove all power -> meter in resistance mode.

          Check the resistance to ground of your 2 x DCin mosfets.

          These are PQ8801 & PQ8802.

          Review the resistance between:

          source (1-2-3) & drain (5-6-7-8)
          source (1-2-3) & gate (4)
          gate (4) & drain (5-6-7-8)

          Post the resistance readings and the scale used on your meter for these tests.

          Repeat for PQ8802. Often the 2nd mosfet gets damaged.

          Do also confirm the resistance to ground of the main power rail which will be mated with the 2nd mosfet (PQ8802) - drain pins (5-6-7-8).
          Attached Files

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            • dqtech
              Badcaps
              • Jul 2018
              • 630
              • N/A
              #4
              Re: Asus X455L Short Mosfet

              sorry the capacitor pad that short is PC8811 and PC8813

              Attached Files

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                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14190
                  • Canada
                  #5
                  Re: Asus X455L Short Mosfet

                  Remove all power. Meter in resistance mode.

                  What are the resistance readings of these parts to ground?

                  Carefully remove each but do not lose the parts. Use low air pressure so other parts are not lost.

                  Is the short gone if you remove these 2 parts?

                  Measure the resistance of these capacitors when they are removed off the board. Is the resistance very low for these parts?

                    Comment

                    • DanielDacko
                      Badcaps Veteran
                      • Mar 2015
                      • 325
                      • Macedonia
                      #6
                      Re: Asus X455L Short Mosfet

                      Do as @mon2 says, he is guiding you properly.
                      I don't provide help for people using CH341A and a clip.

                        Comment

                        • dqtech
                          Badcaps
                          • Jul 2018
                          • 630
                          • N/A
                          #7
                          Re: Asus X455L Short Mosfet

                          Originally posted by mon2
                          Remove all power. Meter in resistance mode.

                          What are the resistance readings of these parts to ground?

                          Carefully remove each but do not lose the parts. Use low air pressure so other parts are not lost.

                          Is the short gone if you remove these 2 parts?

                          Measure the resistance of these capacitors when they are removed off the board. Is the resistance very low for these parts?
                          those capacitor still short when i remove that 2 mosfet...the short only gone when i remove resistor PR8806 and PR8807

                            Comment

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