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MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

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    MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

    MSI RX6900XT MS-395 r5 - i fcked up - when measuring i shorted TOUT/FLT with BOOT on DRMOS. now i dont have main VGPU

    what can be bad? did i burn XDPE132G5D ?
    Attached Files
    Last edited by ktmmotocross; 08-03-2022, 08:03 AM.

    #2
    Re: MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

    god bless AMD for fusing everything. i find that my short blown one of OptiMOS and 20A fuse. after MANY usoldered/soldered capacitors and coils and three hours of work my mistake is repaired.

    But this OptiMOS i cannot find to buy. I have this AON5470 with same layout from RX6800. Have anybody datasheet for it to check if have enought current to use it?
    Attached Files

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      #3
      Re: MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

      I soldered a wire onto the bottom side PCB, to get at the enable pin of a DRMOS, and now the resistance of the pin reads way more, even with the wire removed again. I don't get how I damaged anything.

      I barely touch these when powered, I'd fry too much stuff.

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        #4
        Re: MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

        The 5470qe is probably a custom chip, no datasheet/public offer available, only solution is buy another broken card and use it as donor. You can try to write to Alpha&Omega, but wouldn't expect a helpful response. Remember that MOS devices can change and hold some time state during measuring from non-conducting to conducting and vice versa only due to the applied measuring voltage (gate must be included, state depends on polarity applied to gate), so sometimes it's possible to measure completely different values, and this must not mean, that the device is broken.
        Last edited by DynaxSC; 08-04-2022, 06:25 AM.

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          #5
          Re: MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

          guys anybody know where can buy this TDA21490 ? Best from ali or ebay

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            #6
            Re: MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

            looks like they are on backorder

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              #7
              Re: MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

              i canot find this chip anywhere. who kows where i find this TDA21490

              or i find simillar HIGH CURRENT ic ISL99390

              have somebody datasheet with pinout to compare these two?
              Last edited by ktmmotocross; 09-11-2022, 11:22 PM.

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                #8
                Re: MSI RX6900XT - i fcked up - shorted TOUT with BOOT on

                Hi, my RX 6800 is shorted. I have to find 5470QE. Unfortunately, none is selling it. How did you find it? Is TDA21490 proper and equivalent?

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