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00165 Weird CPU problem

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  • 00165 Weird CPU problem

    Have a 00165 with some issue. The CPU is getting warm just like the other one I did but there is no short to ground betwixt VCORE and PPBUS_G3H

    PPBUS_G3H-8.58V
    PP3v42_G3H-3.43V
    PP5V_S5 = 5V
    PP3v3_S5 = 3.32
    SMC_PM_G2_EN = 3.42
    PPVRTC_G3H = 3.29
    PP3v3_SUS = 0V
    PM_DSW_PWRGD = 3.42
    S5_PWRGD = 3.39
    PPBUS_S5_HS_COMPUTING_ISNS = 8.58

    PM_SLP_S4 = 0
    PP3v3_s4 = 0
    PP5v_s4 = 0

    PPVCOMP_S0_CPU- 0
    VCORE- 9.5 Ohm resistance to ground

    CPU is warm? Wierd

    S4s arent running... of course... Ideas??

  • #2
    Really strange thay CPU gets warm, when only 3V3_S5 is present.
    Could be PCH issue, as you miss PM_SLP_SUS_L I suppose.
    I can only think to VCCRTC issue of PCH.

    Remove heatsink and tocuh PCH die (small one).
    If that heats, most likely VCCRTC problem.
    Check resistance to ground on it.

    Comment


    • Rford
      Rford commented
      Editing a comment
      Indeed it is the PCH portion that is getting warm. Is there a separate VCCRTC? PPVRTC is 16K Ohms to Ground... VCCRTC is within and I cant test it... However ppvrtc connects directly to it.

  • #3
    Actually VCCRTC is the PCH labelling, You are in the RTC portion of the PCH and the name of the power rail going into VCCRTC is PPVRTC_G3H. Yep I had the same issue a few weeks ago on exactly the same board.

    However, your resistance to ground on ppvrtc_g3h doesn't look like a short...
    On my good bord I have 12kohms on the shorted one it's like 3ohms...

    Let us know about :
    PP3V3_SUS = 0V, Is it a short?
    Do you have P3V3_SUS on U8020? You need both P3V3_SUS and PP3V3_S5 at U8020.
    Are you missing (most likely) PM_SLP_SUS_L?

    Comment


    • #4
      3V3_S5 also goes to PCH.
      Don't waste time, if PCH heats without any other voltage than 3V42 and 3V3_S5, board is trash.
      Not always short, or low value in a power rail point to a bad chip.
      Even for high value there, one bad chip can go into some avalanche process when is powered up...

      Comment

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