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Having Issues Running 4k@60hz. PC to TV

CoryDrage

Hi All,

 

I'm new to this forum. Signed up to see if anyone had any suggestions.

 

I recently purchased the LG 65UH770V (http://www.lg.com/uk/tvs/lg-65UH770V)

Then the EVGA NVIDIA GTX 1070 Founders Edition (http://www.evga.com/Products/Product.aspx?pn=08G-P4-6170-KR)

 

Both are compatible with HDMI 2.0. The Graphics Card is HDMI 2.0b and the TV is HDMI 2.0a. (Both compatible with 4k Res @ 60hz)

 

For some reason, when using that setting on the PC. I get full screen flashing.

 

Sometimes it'll be constant and I literally cannot use my PC. But sometimes it won't happen for hours.. There's the inbetween too, where it'll flash on/off once or twice and then not do it for ages.

 

I have tried the suggested fixes for Windows 10 on/off flashing issues, no luck.

 

Tried the suggestions for 4k@60hz flashing issues such as lowering refresh rate to 59hz, making sure the HDMI 2.0 UHD True Colour setting is on on my TV. (Still no luck)

 

I've also tried reinstalling Windows 10 blank. But it was still happening. Completed uninstalled GTX 1070, and reinstalled drivers manually. Still no luck. I've changed from GTX 980 to GTX 1070 in the hope of solving this issue. But still nothing...

 

 

 

Just here to see if someone can help out as it's very frustrating. Got a PC that can play 4k Games, got the TV. But still not having my chance to play games because of flashing issues.

 

Thanks in Advance guys!

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1 minute ago, CoryDrage said:

Hi All,

 

I'm new to this forum. Signed up to see if anyone had any suggestions.

 

I recently purchased the LG 65UH770V (http://www.lg.com/uk/tvs/lg-65UH770V)

Then the EVGA NVIDIA GTX 1070 Founders Edition (http://www.evga.com/Products/Product.aspx?pn=08G-P4-6170-KR)

 

Both are compatible with HDMI 2.0. The Graphics Card is HDMI 2.0b and the TV is HDMI 2.0a. (Both compatible with 4k Res @ 60hz)

 

For some reason, when using that setting on the PC. I get full screen flashing.

 

Sometimes it'll be constant and I literally cannot use my PC. But sometimes it won't happen for hours.. There's the inbetween too, where it'll flash on/off once or twice and then not do it for ages.

 

I have tried the suggested fixes for Windows 10 on/off flashing issues, no luck.

 

Tried the suggestions for 4k@60hz flashing issues such as lowering refresh rate to 59hz, making sure the HDMI 2.0 UHD True Colour setting is on on my TV. (Still no luck)

 

I've also tried reinstalling Windows 10 blank. But it was still happening. Completed uninstalled GTX 1070, and reinstalled drivers manually. Still no luck. I've changed from GTX 980 to GTX 1070 in the hope of solving this issue. But still nothing...

 

 

 

Just here to see if someone can help out as it's very frustrating. Got a PC that can play 4k Games, got the TV. But still not having my chance to play games because of flashing issues.

 

Thanks in Advance guys!

Possibly the HDMI cable you are using is having trouble carrying that much data.

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2 minutes ago, Glenwing said:

Possibly the HDMI cable you are using is having trouble carrying that much data.

Does it really work that way with HDMI? It's a digital signal, so it should either work perfectly, or not at all. 

 

@CoryDrage- Why don't you check if it's the TV? You can download a 4k 60Hz video clip onto a USB stick, try to play it off that, and see if it yields the same problem.

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3 minutes ago, Glenwing said:

Possibly the HDMI cable you are using is having trouble carrying that much data.

Sorry. I probably should've mentioned that. I have now used 3 Different HDMI Cables. No change with either.

 

Also tried all 3 HDMI Ports on my TV. With the HDMI 2.0 UHD True Colour setting on and off. Still get the flashing.

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2 minutes ago, Aereldor said:

Does it really work that way with HDMI? It's a digital signal, so it should either work perfectly, or not at all. 

 

@CoryDrage- Why don't you check if it's the TV? You can download a 4k 60Hz video clip onto a USB stick, try to play it off that, and see if it yields the same problem.

@Aereldor- I have been able to use 4k video through the YouTube and Netflix apps, and 4k HDR Video through the Amazon app. That's why it's confusing me. :P 

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5 minutes ago, CoryDrage said:

@Aereldor- I have been able to use 4k video through the YouTube and Netflix apps, and 4k HDR Video through the Amazon app. That's why it's confusing me. :P 

Alright, so it isn't the panel. Does your TV have a DisplayPort input? If so, try using that. 

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9 minutes ago, Aereldor said:

Does it really work that way with HDMI? It's a digital signal, so it should either work perfectly, or not at all. 

 

@CoryDrage- Why don't you check if it's the TV? You can download a 4k 60Hz video clip onto a USB stick, try to play it off that, and see if it yields the same problem.

Yes, so if it's working intermittently due to the cable, it may rapidly switch between working perfectly and not working at all = flickering.

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3 minutes ago, Aereldor said:

Alright, so it isn't the panel. Does your TV have a DisplayPort input? If so, try using that. 

No, literally just HDMI and they're all HDMI 2.0a. So should be compatible. Was thinking maybe I had a problem on my computer. But done a full fresh install of Windows 10 Pro 64bit last night. Still getting the problem.

 

PC Specs if they're helpful.

i7-2600k (I know, a little old, but still fast) Quad-Core 3.4Ghz - Boosts to 3.8Ghz

16GB DDR3 1600. 

Samsung 840 EVO 250GB SSD.

EVGA GTX 1070 Founders Edition.

 

 

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2 minutes ago, Glenwing said:

Yes, so if it's working intermittently due to the cable, it may rapidly switch between working perfectly and not working at all = flickering.

@Glenwing- But I've tried a few different cables. All with no difference. So annoying now. lol.

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5 minutes ago, Glenwing said:

Yeah, was just explaining how it's possible for a cable to cause this problem.

I know mate. Thanks. :) 

 

I appreciate any help that can be offered as it has me baffled. lol.

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Have you tried other resolutions (from your PC) to see if it makes a difference? If it persists then definitely the TV...

My Rig:

Xeon E5 1680 V2 @ 4.5GHz - Asus Rampage IV Extreme X79 Mobo - 64GB DDR3 1600MHz - 8 x 8GB Corsair Vengeance Low Profile - CAS 10-10-10-27 - AMD Radeon RX 6700XT Sapphire Pulse 12GB - DeepCool E-Shield E-ATX Tempered Glass Case - 1 x 1TB Crucial P1 NVMe SSD - BeQuiet Straight Power 11 850W Gold+ Quad rail - Fractal Design Celsius S36 & 6 x 120mm silent fans - Lenovo KBBH21 - Corsair Glaive RGB Pro - Windows 10 Pro 64-Bit

 

Monitors - 3 x Acer Nitro 23.8" 1080p 75Hz IPS 1ms Freesync Panels = AMD Eyefinity @ 75Hz

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2 minutes ago, Brennan_Price said:

Have you tried other resolutions (from your PC) to see if it makes a difference? If it persists then definitely the TV...

When I go to 1080p or 720p it seems to be fine. It's just whenever it's displaying 4k content. (Only from PC as mentioned before, it works in all TV Apps and so on, just not from PC)

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58 minutes ago, CoryDrage said:

 

Thanks in Advance guys!

most likely caused by either a faulty HDMI Cable or a cable not capable of that much data transfer

Spoiler

CPU: R5 1600 @ 4.2 GHz; GPU: Asus STRIX & Gigabyte g1 GTX 1070 SLI; RAM: 16 GB Corsair vengeance 3200 MHz ; Mobo: Asrock Taichi x470; SSD: 512 gb Samsung 950 Pro Storage: 5x Seagate 2TB drives; 1x 2TB WD PurplePSU: 700 Watt Huntkey; Peripherals: Acer S277HK 4K Monitor; Logitech G502 gaming mouse; Corsair K95 Mechanical keyboard; 5.1 Logitech x530 sound system

 01000010 01101001 01101110 01100001 01110010 01111001 00100000 01100100 01101111 01100101 01110011 01101110 00100111 01110100 00100000 01101101 01100001 01101011 01100101 00100000 01111001 01101111 01110101 00100000 01110000 01110010 01101111 00101110

 

 

 

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2 minutes ago, Cryptonite said:

most likely caused by either a faulty HDMI Cable or a cable not capable of that much data transfer

Well-

 

55 minutes ago, CoryDrage said:

Sorry. I probably should've mentioned that. I have now used 3 Different HDMI Cables. No change with either.

 

Also tried all 3 HDMI Ports on my TV. With the HDMI 2.0 UHD True Colour setting on and off. Still get the flashing.

 

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1 minute ago, Aereldor said:

Well-

 

 

 

45 minutes ago, CoryDrage said:

@Glenwing- But I've tried a few different cables. All with no difference. So annoying now. lol.

Where did you get these cables? are they 2.0 certified? I have 5 HDMI cables non of which can handle 4k

Spoiler

CPU: R5 1600 @ 4.2 GHz; GPU: Asus STRIX & Gigabyte g1 GTX 1070 SLI; RAM: 16 GB Corsair vengeance 3200 MHz ; Mobo: Asrock Taichi x470; SSD: 512 gb Samsung 950 Pro Storage: 5x Seagate 2TB drives; 1x 2TB WD PurplePSU: 700 Watt Huntkey; Peripherals: Acer S277HK 4K Monitor; Logitech G502 gaming mouse; Corsair K95 Mechanical keyboard; 5.1 Logitech x530 sound system

 01000010 01101001 01101110 01100001 01110010 01111001 00100000 01100100 01101111 01100101 01110011 01101110 00100111 01110100 00100000 01101101 01100001 01101011 01100101 00100000 01111001 01101111 01110101 00100000 01110000 01110010 01101111 00101110

 

 

 

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3 minutes ago, Cryptonite said:

 

Where did you get these cables? are they 2.0 certified? I have 5 HDMI cables non of which can handle 4k

I don't know if you know. But even Linus has done a video showing why all "High Speed" HDMI cables are the same. It's not the cable that has the 2.0 or 1.0 specification, but the ports on the devices you're connecting. E.g. In my case, the Graphics Card & TV. As long as it is "High Speed", it can cope with anything from 1080p up.

 

(https://www.cnet.com/uk/news/why-all-hdmi-cables-are-the-same/)

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2 minutes ago, CoryDrage said:

I don't know if you know. But even Linus has done a video showing why all "High Speed" HDMI cables are the same. It's not the cable that has the 2.0 or 1.0 specification, but the ports on the devices you're connecting. E.g. In my case, the Graphics Card & TV. As long as it is "High Speed", it can cope with anything from 1080p up.

 

(https://www.cnet.com/uk/news/why-all-hdmi-cables-are-the-same/)

I've seen those, but the cables I have (they are bought at a chinamart though) will not give a constant display on my friend's 4K monitor. we had to use the one that came with my LG 23" monitor for him to have a stable display so I was giving my 5 cents from personal experience and headaches. 

 

on the flip side it might be your GPU's HDMI port making trouble.

Spoiler

CPU: R5 1600 @ 4.2 GHz; GPU: Asus STRIX & Gigabyte g1 GTX 1070 SLI; RAM: 16 GB Corsair vengeance 3200 MHz ; Mobo: Asrock Taichi x470; SSD: 512 gb Samsung 950 Pro Storage: 5x Seagate 2TB drives; 1x 2TB WD PurplePSU: 700 Watt Huntkey; Peripherals: Acer S277HK 4K Monitor; Logitech G502 gaming mouse; Corsair K95 Mechanical keyboard; 5.1 Logitech x530 sound system

 01000010 01101001 01101110 01100001 01110010 01111001 00100000 01100100 01101111 01100101 01110011 01101110 00100111 01110100 00100000 01101101 01100001 01101011 01100101 00100000 01111001 01101111 01110101 00100000 01110000 01110010 01101111 00101110

 

 

 

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2 minutes ago, Cryptonite said:

I've seen those, but the cables I have (they are bought at a chinamart though) will not give a constant display on my friend's 4K monitor. we had to use the one that came with my LG 23" monitor for him to have a stable display so I was giving my 5 cents from personal experience and headaches. 

 

on the flip side it might be your GPU's HDMI port making trouble.

I recommend this. 

 

I would also try lowering it to 50hz and raising it in increments. 

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45 minutes ago, CoryDrage said:

I don't know if you know. But even Linus has done a video showing why all "High Speed" HDMI cables are the same. It's not the cable that has the 2.0 or 1.0 specification, but the ports on the devices you're connecting. E.g. In my case, the Graphics Card & TV. As long as it is "High Speed", it can cope with anything from 1080p up.

 

(https://www.cnet.com/uk/news/why-all-hdmi-cables-are-the-same/)

Sort of, but not exactly. HDMI cables don't have versions, but not all HDMI cables are the same. To be certified as "High Speed" your cable must be able to handle 10.2 Gbit/s. That doesn't mean all High-Speed HDMI cables cap out at exactly 10.2 Gbit/s and are all exactly the same, it just means all High-Speed cables can go at least that high. 4K 60 Hz requires about 16 Gbit/s bandwidth. Some High-Speed cables may handle that, some may not. There was no way to tell which ones could or not (until recently) because there was no official classification beyond 10.2 Gbit/s. This is no longer the case however.

 

When HDMI 2.0 was first released the HDMI Forum insisted existing High-Speed cables would be enough, but this has turned out not to be the case, and since then they have rescinded those statements and introduced a new tier for 18 Gbit/s certification, called "Premium High-Speed". You may want to read this article if you want to know more details:

https://www.bluejeanscable.com/articles/premium-hdmi-cable.htm

 

(relevant sections, with emphasis added):

Quote

Well, the 2.0 spec contains a little "cheat" of sorts, and that little cheat may pose some very real problems for users. The 2.0 spec doesn't update the cable quality or testing requirements in any way. Instead, the spec contains a mathematical model called the "worst cable emulator" which is supposed to represent the worst-case HDMI cable that passes HDMI 1.3/1.4 "Category 2" ("High Speed") testing. Sources and sinks (that is, receiving devices, e.g., displays) are required to perform well enough in signal delivery and recovery that a cable which matches the characteristics of the WCE will still function, and this mode of proceeding allowed HDMI Licensing not to come up with a new mandatory tier of cable testing to validate cables for 2.0.

 

That would all be well and good, but for one thing: it's impossible to accurately predict the high-frequency characteristics of a cable from its low-frequency characteristics, and for that reason it's generally not done. Every aspect of loss in a cable gets worse with higher frequencies, and what's more, it doesn't get worse in a nice, predictable curve. Return loss, for example, can be acceptable up to extremely high frequencies, and then have a huge spike when you go a bit higher. This occurs for a variety of reasons, but the chief among them is simply wavelength; frequency and wavelength are inverses, and so as frequency goes up, wavelength gets shorter. Tiny imperfections and periodicities in cable manufacture which made no difference when they were physically short relative to wavelength become enormous problems when they become longer relative to wavelength. And at 9 GHz (that third harmonic of the 3 GHz fundamental of a 6 Gbps signal which we've mentioned), we are dealing with some very short wavelengths indeed -- about an inch and a half in air, or an inch in a solid PE dielectric (the signal travels at nearly the speed of light in air, but only 2/3 the speed of light when the dielectric is polyethylene). Since anything a quarter-wave or longer is potentially significant in transmission-line terms, that means that cable irregularities and variabilities as short as a quarter of an inch can play a significant role in signal loss.

[...]

 

But when HDMI 2.0-type 4K is being run -- currently mostly from computer video cards -- using an extended color gamut and/or high framerate (50 or 60 fps), the 1.3/1.4 testing does NOT represent the actual conditions of use for the cable. We are, at this writing, in "early days" for HDMI 2.0, but indications so far are that the honeymoon is largely over where cable run lengths are concerned. We've had a variety of customers write to us about their experiences when running full-bandwidth 2.0 video, and what they've been finding is that most "high speed cable" does not, at least when run near its longest certified limit, stand up to the task.

 

It remains the case under HDMI 2.0 as before that this isn't a subtle thing; if a cable is failing, you will see the failure manifested, in the great majority of cases, as one of the following, in order of severity:

(1) "Sparkles": individual dropped-out pixels, or
(2) "Line" dropouts where a whole line of video, or the rightward portion, drops out, or
(3) Intermittently flashing or jumping picture, indicating that so much picture data is being lost that the display is losing sync, or
(4) No picture.

These types of issues are what to look for. If you don't see them, your cable is doing fine with the signal currently being run through it. The effect won't be subtle -- it's not about qualitative aspects of the image like shade detail, contrast, and the like.

 

HDMI Licensing acknowledges the issue of some "high speed" cable not quite being up to the task of actually handling the full 2.0 bandwidth, saying:

 

"Although many current High Speed HDMI Cables in the market will perform as originally expected (and support 18Gbps), some unanticipated technical characteristics of some compliant High Speed HDMI Cables that affect performance at higher speeds have been found. These cables are compliant with the Category 2 HDMI Cable requirements and perform successfully at 10.2Gbps, but may fail at 18 Gbps."

 

and hence, HDMI Licensing introduced a third testing tier in addition to "Category 1" (Standard) and "Category 2" (High Speed): the "Premium HDMI Cable."

 

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5 minutes ago, Glenwing said:

Sort of, but not exactly. HDMI cables don't have versions, but not all HDMI cables are the same. To be certified as "High Speed" your cable must be able to handle 10.2 Gbit/s. That doesn't mean all High-Speed HDMI cables cap out at exactly 10.2 Gbit/s and are all exactly the same, it just means all High-Speed cables can go at least that high. 4K 60 Hz requires about 16 Gbit/s bandwidth. Some High-Speed cables may handle that, some may not. There was no way to tell which ones could or not (until recently) because there was no official classification beyond 10.2 Gbit/s. This is no longer the case however.

 

When HDMI 2.0 was first released the HDMI Forum insisted existing High-Speed cables would be enough, but this has turned out not to be the case, and since then a new tier for 18 Gbit/s certification has been released, called "Premium High-Speed". You may want to read this article if you want to know more details:

https://www.bluejeanscable.com/articles/premium-hdmi-cable.htm

 

(relevant sections, with emphasis added):

 

 

 

 

YES! Thank you. Just gonna check where I bought the cable I'm using to see if it meets the 18Gbps speeds just in case.

 

Is it good to mention it's not really happening when it's just sat on web pages and things, or my desktop. But happens a lot when playing games? watching 4k Video? This might be the explanation I needed to find!

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@Glenwing- Had a check today, the HDMI Cable I'm using is the Amazon Basics newest revision. But it says it's capable of up to 18Gbps. The one I used before isn't, but I get flashing with both cables. Either that, or the Amazon Basics one isn't actually capable of 18Gbps. But that would be false advertisement. So.

 

Tried changing the refresh rate to 50hz, still get the flashing, but only when something flashes the screen on and off, like entering a full screen game, or when I switch to the PC input on my TV, I think the way my TV works is, it switches off the HDMI port when you're not on that device, because every time I go from say, another HDMI input like my TiVo box, to my PC's input, the screen flashes a couple of times, and then stops. Specially if I'm just browsing the web like I am on here.

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1 hour ago, CoryDrage said:

@Glenwing- Had a check today, the HDMI Cable I'm using is the Amazon Basics newest revision. But it says it's capable of up to 18Gbps. The one I used before isn't, but I get flashing with both cables. Either that, or the Amazon Basics one isn't actually capable of 18Gbps. But that would be false advertisement. So.

 

Tried changing the refresh rate to 50hz, still get the flashing, but only when something flashes the screen on and off, like entering a full screen game, or when I switch to the PC input on my TV, I think the way my TV works is, it switches off the HDMI port when you're not on that device, because every time I go from say, another HDMI input like my TiVo box, to my PC's input, the screen flashes a couple of times, and then stops. Specially if I'm just browsing the web like I am on here.

The reason I wanted you to check the 50Hz settings was due to the fact to see if it was a 1.4 or a 2.0 HDMI cable. 

 

Is there a way to change the refresh rate of the TV in the settings? Have you checked on this? 

 

Response times are slower with TVs. Something to do with input lag or response times. I forget what it is. I had the same problem when I tried a TV once. I don't know if you can fix it. 

 

I would read a little in this thread and I recommend the second section to start. It talks about longer delays with a TV vs a monitor. 

 

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11 hours ago, e23 said:

The reason I wanted you to check the 50Hz settings was due to the fact to see if it was a 1.4 or a 2.0 HDMI cable. 

 

Is there a way to change the refresh rate of the TV in the settings? Have you checked on this? 

 

Response times are slower with TVs. Something to do with input lag or response times. I forget what it is. I had the same problem when I tried a TV once. I don't know if you can fix it. 

 

I would read a little in this thread and I recommend the second section to start. It talks about longer delays with a TV vs a monitor. 

 

@e23- Thanks mate, I'll definitely have a look. But for a TV, the response time on mine is relatively low. Specially in Game setting.

 

There is no option to change refresh rate in the TV settings unfortunately.

 

Also, there is no such thing as a HDMI 1.4 or 2.0 Cable.

 

It's the port on the devices you're connecting that dictate the HDMI standard being used. The cable specification only goes as far as "High Speed" & "Premium High Speed". Former being 10.2Gbps and latter being 18Gbps. The cable I'm using is 18Gbps certified too. Which is another thing confusing me. lol.

 

It seems to have calmed down, only flashing when switching TV to this HDMI input, and only doing it a few times and then stopping. Or when going into a game, and it switching to full screen, it flashed a couple of times and then stopped. But I still want to find a way to get rid of this. 

 

Have tried almost everything that I can think of now though. Different HDMI cables, different HDMI port on the TV, different Graphics card in my PC, different settings (50hz/59h/60hz).

 

Driving me mad at this point.

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2 hours ago, CoryDrage said:

@e23- Thanks mate, I'll definitely have a look. But for a TV, the response time on mine is relatively low. Specially in Game setting.

 

There is no option to change refresh rate in the TV settings unfortunately.

 

Also, there is no such thing as a HDMI 1.4 or 2.0 Cable.

 

It's the port on the devices you're connecting that dictate the HDMI standard being used. The cable specification only goes as far as "High Speed" & "Premium High Speed". Former being 10.2Gbps and latter being 18Gbps. The cable I'm using is 18Gbps certified too. Which is another thing confusing me. lol.

 

It seems to have calmed down, only flashing when switching TV to this HDMI input, and only doing it a few times and then stopping. Or when going into a game, and it switching to full screen, it flashed a couple of times and then stopped. But I still want to find a way to get rid of this. 

 

Have tried almost everything that I can think of now though. Different HDMI cables, different HDMI port on the TV, different Graphics card in my PC, different settings (50hz/59h/60hz).

 

Driving me mad at this point.

What? 

HDMI Version 1.0–1.2 1.3–1.4 2.0 2.1
4K
3840 × 1600 (≈21:9)
3840 × 2160 (16:9)
4096 × 2160 (≈19:10)
 
24 Hz
-
-
 
50 Hz
30 Hz
30 Hz
 
85 Hz
60 Hz
60 Hz
 
240 Hz
180 Hz
180 Hz

I might not be saying it correctly when I call it a 1.4 cable or 2.0 cable. I guess you could say 1.4 connector or 2.0 connector. I just call it cable and if someone comes along to side explain that would be nice to know how to properly explain this. Am I not thinking of this correctly it's like saying a 2.0 or 3.0 USB cable? 

 

That's a 3840 x 2160 television (off the specs above @ 4k)

1.4 cable - 30 Hz 

2.0 cable - 60 Hz 

 

Reason I had you test 50 Hz was if that didn't work it was a 1.X since max output at that resolution is 30 Hz while 2.0 the max output is 60 Hz . This is kind of an easy way to just check to see if you get any results. If it does work at 50 Hz the cable is not the problem here I would say. 

 

It's something to do with the television itself or a setting on the PC. 

 

I would say with a television there's some strange setting on the television that won't allow it to go to 60Hz. 

 

----- This may fix it. Try turning off HDMI Ultra HD Deep Colour.

 

HDMI Ultra HD Deep Colour - off 

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