Dell Alienware X17 R1 - Power Rail Failure

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  • hobostove
    Senior Member
    • May 2023
    • 73
    • USA
    #1

    Dell Alienware X17 R1 - Power Rail Failure

    I have a Dell gaming laptop here with a blink code of 3 red, 5 blue (power rail failure). 3V and 5V are present, but 1.8V is missing. I looked at PU1801 according to the schematic, and it's not receiving an enable signal. Any ideas where to check next? I think that signal comes from the PCH.

    No obvious shorts under thermal (or probed), damaged components, liquid, etc.

    Board: LA-K472P

    Link to post with schematic
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      1.8V will come up in S0 stage as per schematic. Refer to pg3 of schematic and see all the rails listed in power plane.
      Only 3V/5V/1.0V should be present in standby on adapter.

        Comment

        • hobostove
          Senior Member
          • May 2023
          • 73
          • USA
          #3
          I wasn't able to find +1VALW or +1V_PRIM anywhere else on the schematic. I found where 1.05V is generated, is that the 1V that should be on? I checked the IC that generates 1.05V and no enable signal there.
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