iMac A1418 - No LED, no power after overvoltage on Ethernet port

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  • ryogadan78
    Senior Member
    • Nov 2021
    • 66
    • Italia

    #1

    iMac A1418 - No LED, no power after overvoltage on Ethernet port

    Hi guys, I need your help again.
    I have this iMac from a customer that shut down during a storm along with all the other devices in the house. In particular, the router, connected via Ethernet to the iMac, caught fire.
    When I removed the screen from the iMac to check the status of the LEDs, I noticed that none of them were lit. I had a perfectly compatible and working power supply, so I tried it right away, but the problem remained the same (no LEDs). With the thermal camera, I noticed only a slight warming (32 degrees) of the NCP1605BG chip on the power supply. The rest was completely cold, including the entire motherboard. I then removed the motherboard from the chassis for an initial inspection and immediately noticed signs of burning in the area of the Ethernet port. I am attaching the images. Now I am asking you if I have any reasonable hope of restoring the functionality of the iMac (even by isolating the Ethernet port).
    Thank you very much.​
    Attached Files
  • ryogadan78
    Senior Member
    • Nov 2021
    • 66
    • Italia

    #2
    What could be the next step in the diagnosis phase?

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    • m1ch43lzm
      Badcaps Veteran
      • Mar 2019
      • 412
      • Peru

      #3
      With that kind of damage I'd replace the board, if it's as you said that the router got fried by lightning strike
      Very low chance of the damage being limited to only the Ethernet controller IC, I guess you could try removing it but I don't have hope for it

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