Cant get display on LG tv as second monitor.

mattyfez

mattyfez

mattyfez

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Joined
12 Apr 2007
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12,298
Hi all,
Ive got a dell 1440p motnitor connected to my PC as primary display via DP,
Ive just bought an lg 4k TV which ive hooked up by hdmi.

I can share the screen over wifi to the tv, but its only 30 hz.
I can't get a picture on the TV in windows, but if i reboot I get the BIOS slpash screen on both displays, but once in windows, the the TV says no signal, and windows cant seem to detect the LG TV aas a second monitor.

Any ideas?

Thanks
 
OK ive managed to get both displays working in windows at 1440p, but they wont extend, only duplicate.

And if I click detect displays in windows is says 'cannot detect another display' even though both screens are dislaying lol... gah, WTF?
 
It's now working fine, the dell monitor at 1440p @165hz, and the LG as an extended display at 4k 120 hz.


Good greif, lol...ive no Idea why it suddenly started working.

I can't enable 'play hdr games and app' in windows display settings though, both screens are HDR - does that matter if i enable HDR in games to override it?
 
Correction, the graphics card is 2.0b for what its worth.

Also ive just realised, I reinstalled windows today, done the graphics drivers but theres a shed load of windows updates comming down, so hopefully thres something in there that will stabalise it...we shall see...

I just checked and hdmi 2.0b only supports 4k@60hz and I seemed to get it running at 4k@120hz as thats the TVs max, but I wonder if that was causing an issue too, even though the TV and cable is hdmi 2.1.
 
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It's really weird, I can get it to work from a 'cold boot' I'm guessing its a windows driver issue... then windows10 refuses to recognise TV.
 
RichL said:
You need to stick to 4k60 with your gpu. Both source and display will need to be hdmi 2.1 for 4k120.
Click to expand...

my GPU output is hdmi 2.0b... I wonder if that is the problem.

EDIT, but im happy to have 1440p or 4k @60hz on the telly, I don't really care, I'm just trying to make the telly work.
 
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