In my case, the laptop initially still booted normally, but the NVIDIA GPU was detected without properly initializing. While troubleshooting, I changed the BIOS display mode from Dynamic to dGPU Only. After that, the laptop stopped producing any display at all. The keyboard and fans come on, but I can't access the BIOS and I get no signal from either the internal screen or an external monitor.

I took it to an ASUS authorised service centre. They tested the laptop with another known-good mainboard and said it worked, so they diagnosed my original mainboard as faulty and quoted me for a complete mainboard replacement. The price is far too high, so I'm now looking into component-level motherboard repair instead.

Your situation sounds a little less severe than mine since your laptop was still usable on the iGPU, but the combination of the dedicated GPU and several other motherboard devices suddenly failing sounded similar enough that I wanted to ask.

Did you ever find out exactly what was wrong with your motherboard? Were you able to repair it, and if so, what was actually repaired or replaced and roughly how much did it cost?

I'd really appreciate an update on what eventually happened with yours, even if you ended up not repairing it.

Thanks!

PS4 games run for hours with zero issues. PS5 games crash after 45–70 mins on cold boot, or within 3–5 mins on a warm restart. Symptom: black screen $\to$ white LED on + fan spinning for 5–10s $\to$ shuts down completely. 1st power button press gives 1 beep, 2nd press boots with 3 beeps.

Confirmed measurements:

• 12V rail under load stays rock solid at 12.06–12.08V right until crash.
• Resistances: VDD_GFX 2.0Ω, VDD_SOC 4.1Ω, GDDR6 1.35V 21.5Ω, MISC 9.6Ω.
• Syscon UART telemetry: TSoCTSoC​ is 51–77 °C at crash time (TENVTENV​ 27–35 °C).
• Syscon errors: always starts with B0088108 (Sonics Bus Error), then exactly 3–4 seconds later 808B0000 / 808B00FF (SSD Watchdog Timeout) and 80830019.

Anyone seen this specific sequence on EDM-040 / EDM-052?