G16 GU605MZ (2024, RTX 4080) Shuts Off When on 240W Charger – Fine on Battery or 100W USB-C

[T-T]

Laptop:

ROG Zephyrus G16 GU605MZ (2024)
Specs: Ultra 9 185H, RTX 4080, BIOS 329, EC R3.27

Owned for about 15 month

Sporadic use of gaming mostly video editing

Issue:

Instant black screen shutdown when gaming or loading any 3D app on 240W barrel charger

Runs fine on battery or 100W USB-C charger

Temps during crash: ~60–90°C, no thermal throttling, both GPU / CPU

Happens even with lightweight titles.

What I’ve Tried:

Repasted with TG PTM (not liquid metal) & TG Putty Pro

Cleaned internals

Tried different 240W charger

Updated BIOS, EC, NVIDIA drivers

Set BIOS to dGPU only

Tried this fix:

https://rog-forum.asus.com/t5/gaming-notebooks/rog-strix-g1713qm-black-screen-issues/m-p/1064996#M89...: 

which stopped the instant shut off! but resulted in really laggy system and low FPS (I think it choked the wattage the system was able the draw, Cyberpunk was like 2-9fps for example and desktop was laggy too), the for what ever reason it's not back to instant shut off.

Request:

Has anyone had anything similar happen? 

I'm almost certain it's not a hardware fault because games are able to run fine on battery and USB-C power, and when the 240v is plugged in, G-Helper is showing 80w charging. 

[T-T]

I also see a lot of mentions on the 'Black Sceen' issue when switching display adapter. I don't think this is the same issue as the laptop shuts completely off, not just black screening. 

https://www.nvidia.com/en-us/geforce/forums/game-ready-drivers/13/568606/geforce-grd-57688-feedback-...

[donovan20055]

When running the software hardware info under the GPU section what temps for VRAM memory junction and GPU hotspot are you getting? If possible have an overlay display these numbers until a shutdown occurs. Do the shutdowns happen more or less or the same as original after repaste?

I've noticed on my device that it does not throttle when VRAM gets hot. Instead it shuts down when it gets to 100C.

https://rog-forum.asus.com/t5/rog-zephyrus-series/g16-2024-gu605my-2-issues-after-3-months-of-use-1s...

[T-T]

Yeah I haven't been able to look at VRAM the memory junction temps but when using the 240v after repasting, it's still shutting down, the issue definitely seems power related.

For example Ive just finished playing TW Warhammer 3 for 5 hours, using the 100v cable, frame rate good, loading good ect and the temps hovered around 80ish, with some spikes to 95c on the processor, the graphics card didn't even go over 70c, no shutdowns.

I'm going to try reinstalling windows over the weekend and see if that helps. 

Will update if that helps anything.

[T-T]

I found the issue 

A component has fried 😞

https://imgur.com/a/AMtPjqi

Now to see what RMA says if it's fixable or if it's a write off.

[donovan20055]

Dang nice job finding that. Hopefully your RMA goes well.

E-mail support got back to me for my issue with some troubleshooting web links. I'll go through them and if none of them help I'll have to file an RMA.