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820-4924 - No power ?

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  • 820-4924 - No power ?

    I have a 820-4924 that is liquid damaged. It looks pretty good as the customer brought it quickly. However it is not powering on. Since I do not have a board view for this board, I am not sure where to start.
    I did an ultrasonic cleaning in the crest but that hasn't helped.The problem is rather strange. The Macbook appears to be on because the CPU heats and the fan spins after a few minutes (I know this is normal on this board). However the system shows no other signs of life. No caps lock light, no chime, no display/backlight. I am hoping someone can point me in the right direction.

  • #2
    USB mouse lighting up?

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    • #3
      Originally posted by dukefawks View Post
      USB mouse lighting up?
      No it does not.

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      • #4
        You said no display on an external monitor either correct? In my experience I had a retina with the same symptoms and it was a bad BIOS and I had to reprogram it... Not sure if that may be the case here but i'm just providing input from my experience with this problem.

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        • #5
          Could be anything, most likely corrosion somewhere. Give it a good clean and inspect closely for corrosion. Could be corrosion under any of the BGA chips too..

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          • #6
            I did ultrasonic cleaning already and inspected it closely. No more corrosion. Got my hands on a schematic and all power rails are present. Hmmm, you think liquid damaged the BIOS ?

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            • #7
              Found CPU_VR_EN missing dead PCH ?

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              • #8
                How about CPU_VCCST_PWRGD ?

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                • #9
                  Cpu_vccst_pwrgd - 1.012v

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