BLOD PS4 Original

Hi I’ve had this PS4 forever. It’s been having BLOD issues for the past 2 years. I finally decided to open it up besides the APU and motherboard because I don’t know how to do the thermal paste. I cleaned it extensively and have triple checked all the wires are out back in correct. Can anyone possibly run me through some fixes? I’m williing to pay and I have the toolkit to open it up

Well unfortunately blod 90% of the time means an apu problem, and there is no real way to fix it without very specialized equipment that will cost much more than a new ps4