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Apple iMac 27" A1419 Logic Board 820-3478-A - No power

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  • Apple iMac 27" A1419 Logic Board 820-3478-A - No power

    I have tried with another PSU, replaced isl and bios but it wont start, only the first led lights up, any ideas?

  • #2
    Means 3V3_S5 is present.
    Check if PM_SLP_S5_L pulse at least when trigger SMC_ONOFF_L.
    If yes, 5V_S4 should pulse too.
    Any history available?

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    • #3
      i had to return this machine to the customer so i didn't have time to repair it, you can close this

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