Motherboard schematic or Boardview of Dell XPS 420

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  • cheeky2
    Badcaps Veteran
    • Dec 2012
    • 340
    • uk
    #1

    Motherboard schematic or Boardview of Dell XPS 420

    Unfortunately have an issue with the main power switch which I have traced the issue down to the motherboard! I know it's a long shot as motherboard manuals from Dell are hard to come by. I can turn it on using the bios options when mains power is applied to the PC after the mains power has been removed for a while.
    The only markings on the motherboard are CN-0TP406 and underneath 316764300010 LF-PCB; PWA-SAN MARINO/MB_A01,12
    However I would like to make it fully operational, with the power turned onto the unit from the front power switch. The wiring is fine, it looks like I am missing some voltage from the positive side as I am getting a good ground on one side.
    Tags: None
    • cheeky2
      Badcaps Veteran
      • Dec 2012
      • 340
      • uk
      #2
      Re: Motherboard schematic or Boardview of Dell XPS 420

      After looking closely at the motherboard I have established that the Intel NH82801IR on the PWRBTN# pin T3 on the BGA is either blown or become unsoldered under the BGA. I have tried reflowing the area of the ic without any success. I expected the voltage to be around 3.3V when PC on but its around 0V. So I will not be replacing the Intel NH82801IR ic and will have to live with it. There is no resistance to ground on the pin before the track goes to the T3 pin on the ic. Oh well worth a try!

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