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    Help sourcing replacement / alternative chip

    Hi guys, this chip appears to be shorted to ground. Continuity tests to 20V power pin on one side, then the entire other side is continuity with ground. Also heats up to ridiculous temperatures.
    What alternative chips can I use in place? Or where could I source a replacement. I can't even seem to find documentation on the chip.
    Thanks in advance
    Attached Files
    Last edited by Jdown79; 09-24-2020, 09:14 PM.

    #2
    Re: Help sourcing replacement / alternative chip

    It is a mosfet, Alpha & Omega AON7408
    Attached Files
    Last edited by R_J; 09-24-2020, 09:39 PM.

    Comment


      #3
      Re: Help sourcing replacement / alternative chip

      Originally posted by R_J View Post
      It is a mosfet, Alpha & Omega AON7408
      Thanks so much, I've managed to source a replacement.
      Could you tell me please, how you found it? whats the easiest way to use the numbers on a chip to find online? thanks

      Comment


        #4
        Re: Help sourcing replacement / alternative chip

        Originally posted by R_J View Post
        It is a mosfet, Alpha & Omega AON7408
        I would also like to how you found this part number
        9 PC LCD Monitor
        6 LCD Flat Screen TV
        30 Desk Top Switching Power Supply
        10 Battery Charger Switching Power Supply for Power Tool
        6 18v Lithium Battery Power Boards for Tool Battery Packs
        1 XBox 360 Switching Power Supply and M Board
        25 Servo Drives 220/460 3 Phase
        6 De-soldering Station Switching Power Supply 1 Power Supply
        1 Dell Mother Board
        15 Computer Power Supply
        1 HP Printer Supply & Control Board * lighting finished it *


        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
        2 Hem Saw Computer Stack Board

        All of these had CAPs POOF
        All of the mosfet that are taken out by bad caps

        Comment


          #5
          Re: Help sourcing replacement / alternative chip

          part number is etched on it - next to the company logo

          Comment


            #6
            Re: Help sourcing replacement / alternative chip

            once side is all drains .maybe they all are supposed to go to ground .

            Comment


              #7
              Re: Help sourcing replacement / alternative chip

              it takes a lot of heat to swap that package type - the entire underside is metal

              Comment


                #8
                Re: Help sourcing replacement / alternative chip

                Originally posted by stj View Post
                part number is etched on it - next to the company logo

                If you just google 7408 nothing comes up I did not recognize that company logo
                Last edited by sam_sam_sam; 09-25-2020, 07:58 PM.
                9 PC LCD Monitor
                6 LCD Flat Screen TV
                30 Desk Top Switching Power Supply
                10 Battery Charger Switching Power Supply for Power Tool
                6 18v Lithium Battery Power Boards for Tool Battery Packs
                1 XBox 360 Switching Power Supply and M Board
                25 Servo Drives 220/460 3 Phase
                6 De-soldering Station Switching Power Supply 1 Power Supply
                1 Dell Mother Board
                15 Computer Power Supply
                1 HP Printer Supply & Control Board * lighting finished it *


                These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                2 Hem Saw Computer Stack Board

                All of these had CAPs POOF
                All of the mosfet that are taken out by bad caps

                Comment


                  #9
                  Re: Help sourcing replacement / alternative chip

                  If you know the logo, all you need to search is "alpha & omega 7408"
                  Last edited by R_J; 09-25-2020, 09:47 PM.

                  Comment

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