I've finally figured it out. In essence, it's the LG TV "fighting" against the Windows display config to give the best visual output.
It's a feature of LG TVs called "HDMI ULTRA HD Deep Colour" - not all devices support it.
(it's worth mentioning that it could also be the TruMotion settings - I disabled both and it suddenly started working perfectly. No green lines, no flashing, perfect 👌)
Reposting this because the original thread seems to have disappeared...
Re: NUC7ixBN Screen Flashing (screen turns on and off) when using 4K resolutions
posted 11 28, 18 9:11 PM
29th November 2018 and this issue still seems to be happening...
I'm having the same issues with my new Intel NUC BOXNUC7I3BNK connecting via HDMI through my new Onkyo tx-nr686 AVR to my LG 4K TV. Constantly stutters with black screen flashes (and occasionally has fine green horizontal lines running through intermittently too) in all areas of Windows 10 (latest updates) - login screen, desktop, VLC, Media Player Classic, Windows Film & TV app, etc etc etc.
The system is as follows:
I've tried a brand new HDMI 2.0b cable, an older HDMI cable and a shielded HDMI 1.4 connector, and all experience the same flickering and green lines (the shielded 1.4 is noticeably better than the rest, but it's still flashing off and on a few times a minute. The 2.0b is unbearable, constantly flicking off and on every few seconds).
Played around with different resolutions and refresh rates on the gfx card. Happens about the same at 4K res or 1080p res, but it's definitely much reduced when running at lower refresh rates (50Hz or less), not ideal really for a media PC i built specifically for High Def 4K media playing
When connected to the TV directly, the flickering is reduced a little, but not eliminated entirely (and besides that, it's incredibly inconvenient to do this as i bought the nuc so to get around having too many cables everywhere so I could just use hdmi).
Seems to me to indicate it's a driver, firmware or bios issue, or maybe a RAM compatibility issue?
I have replaced the gskill dimm with a Crucial dimm (details below) which is from the Intel recommended parts list, but the issue still persists. No improvement at all.
Crucial 8GB DDR4 2400 MT/s (PC4-19200) CL17 SR x8 Unbuffered SODIMM 260pin Single Ranked
Same exact issue here (on/off flash, plus periodic streak horizontal flash of green pixels, at random locations) with a brand new out of box NUC8I7BEH. Clean install of Win10. Graphics drivers v. 184.108.40.20687. Running at 4k/60hz on a Dell U2718Q Monitor.
LeoC_Intel, this can't be the result of the display....it's either a NUC, Cable, or SW (Likely, but unsure whether it's Windows or driver related). I'm not having any luck finding answers on this...going to try a new cable. May consider the return of the NUC.
I'm not well read up on this...but looks like it may be a windows issue from the last update. Some services at the root. I saw a suggesting to disable the service "Windows Error Reporting" and "Problem REports and Solutions Control Panel Reports".
right-click windows button, select run
Uncheck those above service, apply and restart.
So far so good for me, but it's only been a short while. Hope that helps!
i am having the same issue... for more than three months i am trying to find a solution or hope that intel would finally do something about it. i feel like i have been ripped of and cheated since in the product specs they say 4k 60hz supported. well... not so much. i am so disappointed. having nuc 7i3bnk, hdmi 2.1 cable, lg oled65c8 and it simply just flickers as hell. randomly, cannot watch anything, basically my nuc sits in the living room turned off.
LeoC, I could try the device with wired connections, but what would be the point? The device isn't a very viable HTPC if you have to use a wired keyboard and mouse. I have 4K 60hz Dell monitors I could test the screen on... but again, what's the point? It needs to work on my TV the way it's advertised to. Unless Intel is aware of a specific conflict with their device and LG's TV panels and just aren't reporting it, it seems like a pointless endeavour. 3 months on from this post, and over 2 years since the last firmware update in Jan 2017... and still nothing to fix this known issue. I've contacted the retailer I purchased from and they've told me that they won't accept a warranty claim because the device functions, regardless of the issue 60Hz/4K res. The only other avenue would be sending it back to Intel directly, but I've read some of the posts from other people about that experience, and I don't have time for that only to be told they can't replicate the fault.
So i've pretty much given up at this point... i just run the thing at 30Hz refresh. Seems to work OK for the most part (just occasional sound glitches), but it's obviously not what I bought the thing for.
Will never buy another Intel product again, that's for sure.
I have the same issue. I have a NUC8i3BEH win10 Pro OS with latest Intel and Win10 updates connecting to LG TV. The blinking happens on LG TV but not on computer monitor. The only solution to fix the problem seem to be unplug both TV and NUC for 30 seconds. Some day, I have to repeat it 2 to 3 times to resolve it. Is it possible that Intel graphic driver is having hand shake problem with LG TV??? Would be nice if I can set the graphic driver for LG TV on boot.