iMac 820-01779-A not turn on

[MarcinRdm]

I have iMac that does not boot. The power supply gives 12v. No response to the switch. I am looking for a schematic and boardview.

 

[2informaticos]

01779-01823.rar

drive.google.com

 

[MarcinRdm]

Thank you. Whether to start with G3H rails ?

 

[2informaticos]

Check if U7800 generates the AWAKE and SLPS2R voltages required by T2.

 

[MarcinRdm]

PP1V1_SLPS2R 1.1v
PP1V8_SLPS2R 1.8v
PP1V2_AWAKE 1.2v
PP3V3_AWAKE 3.3v
PP1V8_AWAKE I connected the board directly to the 12v power supply. not sure how to explain it but sometimes it is 1.8v and sometimes it is absent.

 

[2informaticos]

Is the machine recognized in DFU mode?

 

[MarcinRdm]

Revive device helped. I should start with this. Thank you