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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Won’t turn on!?

Hi there, I’m Adam. I have been trying to get this 2013 iMac working, to no avail.

The screen was shattered at the top, right near the camera.

When plugged in, the hard drive spins, and the first diagnostic LED is on. When the power button is pressed, absolutely nothing happens; the hard drive remains spinning, and the first led stays lit.

I replaced the power supply with one from eBay and nothing changed. I tested the power button for continuity, and it definitely works.

I’m good at soldering/wrenching, and I have a multimeter, but I am unfamiliar with iMac stuff.

I need help! What do I try next?

Answer this question I have this problem too

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Here's a breakdown of the onboard diagnostic LED's:

  • LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board. This LED will remain ON while the iMac is connected to the AC power. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power is disconnected or the power supply is faulty.
  • LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
  • LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.
  • LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.

From what you are saying your power supply is OK, but your logic board has a problem ;-{

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@crystalcoconut if the 2nd LED never comes on then you are having issues with the power supply to the logic board. Start by measuring the voltage coming from your power supply on connector J6900 and you also have to check J6901 since that is your signal connector telling the power supply what to do. If you have trouble finding any of this it will be helpful if you post some good pictures of your logic board with your question. For that use this guide Adding images to an existing question

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CrystalCoconut will be eternally grateful.
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