Dell XPS 8100 Motherboard VRMS keep blowing

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  • 90Ninety
    Senior Member
    • Aug 2011
    • 86
    • UK Mains Voltage 240V 50 Hz
    #1

    Dell XPS 8100 Motherboard VRMS keep blowing


    I wanted to save this thing from E-waste ... I helped a neighbour with their Dell PC , it had a blown visably blown VRM causing a short on the 12V EPS ..

    I replaced this VRM which fixed the short but, the high side VRM's keep blowing , seemingly the same two phases .. I replaced the low side mosfets on the respective blown phases . Though still the High side VRMS are blowing ..

    After a few minutes one of the four phases will get extremely hot , then blow ..

    I purchased replacement VRMS both High Side (72T02GH) and Low side (86T02GH). Pictured below , I just removed the last blown high side VRM and temporarily removed the nearby capcitor to check


    Click image for larger version Name: dell .jpg Views: 0 Size: 298.4 KB ID: 3477166

    I have stabbed around the board , there is no shorted caps . All nearby resistors seem fine too ..

    I think the picture below is the VRM controller (NCP5395T), this chip is available on AliExpress. Would it be worth buying and swapping it out

    Click image for larger version Name: vrm controller.jpg Views: 44 Size: 163.8 KB ID: 3477175
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    • 90Ninety
      Senior Member
      • Aug 2011
      • 86
      • UK Mains Voltage 240V 50 Hz
      #2
      I fixed this

      I wound up replacing all the phase mosfets .. No issue now

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