My Xbox Series X started powering itself off mid-game — but only in some games, which ruled out most of the easy explanations straight away. Working out why turned into a proper electrical and thermal diagnosis, ending with the console fully stripped down to the bare APU die.
Project Notes
| Status | Completed |
| Goal | Diagnose and fix an Xbox Series X that shut itself down during certain games, without just replacing parts on a guess. |
Systematic testing across a range of games narrowed the fault down to something load-dependent rather than simply “3D games bad” — Forza Horizon 2 ran complex 3D graphics indefinitely, while Minecraft’s bursty startup killed the console almost instantly. A teardown and PSU voltage test ruled out an outright dead power supply, and a control test after reassembly looked briefly like a fix (connector reseating) before extended testing proved the fault was still there, just needing longer to show up.
That longer-to-show-up behavior turned out to be the real clue: a hot restart failed almost instantly, while a cold start bought about twenty minutes — a classic heat-soak profile. Stripping the console all the way down to the bare APU die confirmed it directly: the factory thermal paste was completely dry and cracked, six years after the console’s original build. A repaste with fresh Arctic MX-6 fixed it — an hour of the single most reliable failure case in the whole investigation (Halo Campaign Evolved) ran with zero issues afterward.
More details:
- My Xbox Series X Keeps Shutting Down, Part 1: Chasing the Fault — the diagnosis
- My Xbox Series X Keeps Shutting Down, Part 2: The Fix — the repaste and the result
