Chosen Solution

So, like many, my Xbox One X was becoming a jet-plane on every single game. Fan was insanely loud. So I decided I’d do the ol’ clean up and new thermal paste / pads. I followed the recommended YouTube videos that are passed around here often. I did a “pea size” dab of paste, not too much. I did some new 2mm square thermal pads on the VRAM where the originals used to be. The box actually blasts the fan even louder now. It just takes off. And then shuts down immediately. It’s worse than before. I’ve taken it apart twice now, redone the thermal paste twice, double-checked the pads. The clamp has the sink down nice and tight. Everything is making contact. The air it’s blowing out is cold too, I might add. What’s going on? It’s out of warranty, it’d cost me $250 to send it in. This should be an easy fix. I’m not new to thermal paste, I build PCs, I’ve repaired stuff before. This is confusing the !&&* out of me. Thanks in advance. Hope this is solvable :(

It turned out to be the thermal pads. They did not compress enough and were causing a very small air-gap between the APU and the heatsink. New Grizzly Thermal pads compressed better and created a full contact.

I know you mentioned you built computers but have you cleaned out the dust from the heat sinks? Are you certain it’s over heating? Or is it thinking it’s overheating? Meaning that even if it’s not getting hot, it’s still ramping up the fan speed?