8K X Occasionally Blacks out for a few seconds (Potentially Solved, EMI Ground Loop/ Interference likely the cause)

This is getting no where it seems

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Giving them full details on your pc if you haven’t already may indeed help.

Ie cpu, ram(vendor speed) gpu vendor and driver. Power supply etc…

Peripherals and software that maybe running.
Program settings i.e. for pitool, iracing, steam and gpu.

There test machines maybe too clean to create the condition to cause a blackout.

@PimaxQuorra are the techs testing the games like Iracing playing online?

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Yup, they will be testing with games or other apps.

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9900KS@5.0 all cores
32gb@4000mhz
nvidia 3090 FE or EVGA FTW3 Ultra 3090 (both happened)
asus maximus xi extreme motherboard

It’s happened in iRacing and Star wars Squadrons once as well (in the menus).
I already gave all this info to the support ticket that’s been on going from the beginning of april.

steamVR1.16.10
Pitool 270
firmware 2.1.255.271

Either 75hz or 90hz - happens in both

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Your memory; what is the specs n vendor?

I highly doubt that the memory would cause the HMD to fail intermittently with just the display panels. This is an internal issue in the HMD it self, maybe driver issue in regards to how it handles the DP signal from Nvidia cards. (don’t think I’ve heard of any AMD users with issues)

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Memory would be trident-z royal

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I agree with this i think thats the case

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Support just sent me a new firmware to test. Ill try that one but they have no been able to reproduce the blackouts so nothing is going to change with this one although ill try it just for giggles

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So now they’re saying they “found something in the firmware”… Very vague and most likely has nothing to do with the blackouts but we’ll see.

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I agree but to duplicate all conditions these details are a must; even if to eliminate them.

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They need to make a Standard Hardware setup, with a (no more than 2 generations old Intel CPU, the correct RAM for such CPU and Motherboard.
Preferred an Nvidia 3090 to verify 90Hz option as well, and most importantly LightHouse 2.0’s

This should be their testbed for Pimax HMD’s
And an AMD rig to further standardize testing.

Sorry not to dis AMD but Nvidia Intel is what we see most of, and Mike has as well :slightly_smiling_face:

I agree. I know most people ive seen are using an nvidia GPU, maybe not the CPU… but definitely those having blackouts happening are those with Nvidia GPU’s. That doesn’t necessarily mean it’s an Nvidia related issue because we just dont hear of many users with pimax hmd’s and AMD GPU’s either.

I went back to my 8kx for now. I’ll be testing starting tomorrow. I use it for 2+ hrs in the mornings and each day mon-friday usually. The blackout usually happens in the 2nd half of my usage too. We’ll see what happens with this new firmware they gave me.

I mentioned to them that one of the things I noticed in the pimax logs after the blackout happened was a line that said “TE NOK!!” - i dont know what it means but just the way it’s written in the log and that it shows up after a blackout, made me think it’s something related.

They sent me a beta firmware to try (before the new beta pitool they’ll be sending me) that is named with the words “No TE” at the end of the firmware file name.

I asked support what they changed just to see if i dont have a blackout then that would mean this is related. But i guess further testing will show whether whatever they took out related to “TE NOK” has to do with it.

I just wish everything was more open and not so secretive.

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New FW / Pitool - no good - 2 blackouts in 45 min and lasted longer about 10s each

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Does anyone here who’s had blackouts use an overlay app like OVRToolkit? Maybe that’s causing conflicts?

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KFA 3090 Gaming 461.33 driver. 8kX 90hz

I dont really know what is going on but my first 8kX had no issues. Then after needing a new module from my own doing ive started having lots of blackouts

In general i had a couple of blackouts in about 2 hours and usually 30 min+ in. I installed Iracing again yesterday and had a blackout pretty soon after. Then i opened my KFA OC software and put the fans to 100% and no more issues. This happens on occasion in DCS world and other games too. Once i had blackouts every 5 seconds in DCS and it was also solved with the fans. I cant tell you 100% its related but it did the same thing.

So who is really at fault. Seems like combination of Nvidia driver maybe some ram heat and Pimax firmware not playing well. I tried a few different FW (and debug) too but there was no change

I never had any issues on my Reverb G2 or any other HMD using the same driver.

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Absolutely put in a support ticket. They need to know
Im trying something different right now and i moved the cable away from my motion rig. I had my Traction Loss Platform grounded by drilling a hole into one of the profiles and putting a wire in it directly to the grounding port in an outlet.

Because of the motion rig and the EMI (even though I shielded all the cables and did everything i could, the 8kx was always sensitive to me touching it. I always put my hands on it and within a second the image starts to jitter because of the EMI. When I put the grounding cable right into my motion rig’s platform, that went away, But the 8kx cable goes right across the platform. So yesterday i took the grounding cable out and the 8kx became sensitive to the touch again, but i didnt have a blackout yet. Im going to test more today and see if that was the issue. The cables pimax uses are really cheap and unshielded unfortunately, so they’re easily susceptible to any kind of EMI (kind of like when I wore my apple watch with the first 5k+ and had no clue that was causing me tons of tracking issues).

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I MAY have found the issue. So i ran 2 races - no blackouts. I did have some flashing black screens for a split second like 6-7 times in the first race. 2nd race it happened once. I think its when the cable gets closer to the aluminum extrusion of my motion platform, but it didnt blackout for a long period. I actually won the first race luckily.

So if this keeps up, then the grounding cable that i attached to the platform, and with the cable running right across the aluminum extrusion, that was probably the issue right there - but more time is needed. I plan on gettin some ceiling hooks to have the cable run over the top

It seems like it’s a ground loop possibly that was causing it… But they swear their cables are shielded/grounded.

I also tried wrapping the optical cable through a large ferrite - that just gave me issues with tracking just cutting out and the game freezing - so that didnt work for some reason.

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Ive come to the conclusion it is DEFINITELY EMI or a ground loop (most likely a ground loop). I tried the headset without the grounding cable connected to the platform and move the cable over the top of the rig instead of down below across the bottom platform’s aluminum profiles. Now no blackouts but it’s super sensitive to the touch and I have these micro-blackouts that happen 5-10 times in a race which are manageable but when i went into a 2nd race, the entire headset disconnected. I heard the USB unplug, game disconnected, and it reconnected after… It’s cutting power to it even though i move the cable over the top, it seems there’s enough of a ground loop to cause these cutouts now. So next i will try a few other things - hanging over the ceiling when i get these cable hooks, connecting the USB to a different outlet somehow, and reconnecting the grounding cable also but with the cable rerouted or plugged into a different outlet. Hopefully these steps will alleviate it altogether. We’re moving in the right direction in my case though

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Told you so!

I wonder if an extra earthing cable to the headset, maybe to the micro usb socket would break the earth loop?

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