Xbox 1s power on then off

I’ve got a xbox 1s turns on, chim sound works, eject works, and also powers on when disc is inserted, no fan startup but turns off after 5 seconds. No display when it does it. I’ve checked the mosfets and all seem good, also replaced powersupply with a good one, same with a new fan. Any idea what my next step to check would be?

Usually this type of problem is caused by either a faulty APU or faulty solder joints under the APU

If it were power supply mate it wouldn’t even turn on but I agree likely apu that was a huge issue with the phat ps3’s their apu’s would come loose then they would stop powering on properly