iMac 2017 820-00609 Not turning on

[Rez Razmi]

I have a 2017 iMac which is not turning on at all. the 4 LED on the motherboard is not turning on at all. I checked it with another power supply but no light or any sign on the logic board. I can see 12.5v or 3.3v on some capacitors so I assume the power supply is fine. Any idea where I should look to?

 

[2informaticos]

No schematic available; you can use 00134 as guide, being similar in some places.
Taking this one as reference, check if you get 12V_S5_FET voltage at Q8470.
If not, change Q8470.

 

[Rez Razmi]

No schematic available; you can use 00134 as guide, being similar in some places.
Taking this one as reference, check if you get 12V_S5_FET voltage at Q8470.
If not, change Q8470.

trying to find Q8470 with the 00134 boardview
Could you please help me to locate it. Here is a photo of the board. Which area should I look for

 

[2informaticos]

There is no other power MOSFET connected with Drain to 12V_G3H (power connector).
You should be able to find it; probably SOP-8, or DFN-8 package.
No sufficient resolution to make an idea in that picture.

Do not quote an entire post, visible few centimeters above.
Any reason to do that?
Please, maintain forum aesthetic...