Author Topic: Need help troubleshooting Power Supply or Logic Board issue on 2017 iMac 21.5  (Read 125 times)

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Offline Zataralos

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  • Country: us
Hoping to get some guidance as I can't find any schematics for my iMac :(. I recently changed the EFI chip on a 2017 21.5 4K iMac and now it won't boot. LED1 comes on and LED2 flashes every 5 seconds but power button does nothing. I checked voltage at the power button and getting 3.28v. Trying to figure out if it's the PS or the logic board. I took a few readings while it was plugged in (see attached photos). What else can I check before starting to replace parts. In case you're wondering, yes I know how to micro-solder and installed the EFI correctly ;)

Any help, especially on what voltages I should be seeing in the power connectors would be great.


Online fzabkar

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