Hi!

I'm looking for any experience about 2017 iMac with random shut down.
It's a working one but only I can use for 4-5 minutes, after shut down and cannot turn it again. But I tried it a few days later (5-6 days) and it works, and after 4-5 minutes crashed again.

All of the voltages fine on the board, and no visible damage or burned components or water damage. No shorts to the ground.
I replaced a couple components to find the problem: PSU, CPU, RAM, RTC battery, BIOS.

Only I find LCD backlight fuse dead caused by bad LCD cable, I replaced it...

Re: Schematics iMac A1418 820-3482-A



any idea for fix this logic board?

If I put CPU in socket I have a short on ppcpuvcc_s0_cpu circle.
no bent cpu socket pins, I,ve already tried it with a working CPU.

Re: Schematics iMac A1418 820-3482-A

is it possible if ppcpuvcc_s0_cpu shorted caused by the CPU dead?

Re: looking for schematics/boardview for Mac mini A1347 Late 2012

820-3228 or 820-3227 boardview?

I have an 820-2733-A board no power on, no first LED (and other) but I have a good working PSU. I can check the 12V on the PSU and board but I think I have a short in PP12v_S5 line and that cause the black LED.
How can I find the short component? when is't plugged in nothing getting hot and everything it's looking fine on the board. I have external power supply.

Re: iMac A1418 21 inch 2013/2014 820-3588-A NO POWER, FIXED!

I checked all parts on board, it looks fine and no damage, no touchable heat up, I think I should try it with PSU bench but I never used before.
I will check voltages around PCH.

Re: iMac A1418 21 inch 2013/2014 820-3588-A NO POWER, FIXED!

Same problem here and after reflow SMC nothing happened, is it possilbe the SMC is totally dead? And reg_p3v3s5_vout shorted to ground near U7600 Any idea to find the issue?
I replaced U7600 and nothing happened.