iMac is dead.
I tested the power supply separately from the logic board and all the pins match the expected amounts. When I attach it to the logic board, all the pins are dead, zero volts everywhere.
Q: Does this mean there’s a short on the logic board? Wouldn’t the pins still show a voltage since the short is drawing power?
Q: Do I need to supply voltage to the board to find the short?
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Yes, you have a short within the logic board, often it’s the MXM GPU board that fails.
Time to pullout the DVM and check the power rails for a short (without the power supply connected). You’ll need the board-views and schematics for the system.
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DVM? Digital voltmeter, right? (Just checking) ;)
Also, can I assume that the power supply is prob OK?
@Paul Spinelli - Likely, you really need to test the logic board power rails for a short
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