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820-4924 Hot PCH no Post

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  • 820-4924 Hot PCH no Post

    I bought a dead device on local ebay. Water indicators are all red, it was really sodomized by someone around Q7010 (PPDCIN_G3H_ISOL), D7010 was soldered reverse, C7590 and C7572 were also cracked of the board.
    The board autostarts only with battery attached, goes to 0.25A(old battery is probably dead, with the good one it looks generally the same after it was charged to 100%),
    No bell/image, PCH is getting warm.
    BIOS reflash does not make any difference. All Power rails seem to be present, VCORE is 1.7V and stable.
    EDP_BKLT_EN is not present, no short.
    I do not see any activity on Bios chip, also nothing on SPI_MLB_CLK.
    LPC_CLK24M_SMC is present.
    Dead PCH, good luck changing SoC chip?

  • #2
    Post DC voltages of SPI chip.
    Any USB activity?

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    • #3
      Originally posted by 2informaticos View Post
      Post DC voltages of SPI chip.
      Any USB activity?
      SPI_MLBROM_CS_L, SPI_MLB_IO1_MISO, SPI_MLB_IO2_WP_L, PP3V3_SUS 3.3v Stable, no activity on Oscilloscope
      Nothing on SPI_MLB_CLK, SPI_MLB_IO3_HOLD_L, SPI_MLB_IO0_MOSI

      No usb activity on bootable USB, mouse light on, Keyboard capslock dead

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      • #4
        Probably dead CPU...

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