How to verify the logic board
How can the logic board be verified? LED #1 is lit but others are all off and when the power button is pushed nothing happens. The iMac will not power up.
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The #1 LED only indicates that it is getting trickle power. Most likely is a failed power supply.
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I just replaced the power supply and it's still the same. Only LED #1 is lit and iMac won't power up. I disconnected the power button and checked continuity, it seems ok. Power supply pin 5 has 2.6 volts, pin 9 has 12.2 volts and the rest are all 0.
by srsd