Changed my resolution to 3840x2160 and i get a screen full of static, please help !

jmoi308

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Aug 14, 2014
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Hello,

I bought a i5 4460 sometime ago, and earlier this week I bought a new LG 49UH6100 UHD 4K TV all connected to my Onkyo TX-NR646. Once I changed my resolution to 3840x2160, it was well besides there being white dots showering the blacks on the screen. Then I put in Wall-E on blu-ray and the screen began to flicker, and then I got a blanket screen of static. If I change to 1920x1080 everything bagans to be fine. Not sure I am going to need a graphics card or a new mother board, but I need help because I dont want to waste money.

i54460
PSU CS550M
SSD 125gb
HDD 3tb
HDD1tb
HDD 150gb
Mother Board GA-H87M-D3H
 

dudio

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Is this problem with the computer connected directly to the TV, or running thru the Onkyo first?
Try it both ways out of curiousity. If it's the same, I'd suggest a dedicated GPU (GTX 1070?) as your graphics capability is maxed running it off the integrated.

3840x2160 @60 Hz Max Resolution (DP) is the maximum resolution supported by the processor via the DP interface (24bits per pixel & 60Hz). System or device display resolution is dependent on multiple system design factors; actual resolution may be lower on your system.
 

jmoi308

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Aug 14, 2014
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Hello,

Yes the Onkyo is capable of 4K @ 60Hz, I have my pc,ps4 conected to my Onkyo then everything out to TV via Onkyo.

PC (HDMI)>Onkyo>TV-PS4 HDMI>Onkyo>TV
 

NeoSpudly

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Jul 23, 2015
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let us know if it works when the machine is hooked up directly to the TV as a high speed HDMI cable is required for 4K @ 60Hz, the black one that came with the PS4 is high speed as that is what i used to attach my PC to my 4K set.
 

NeoSpudly

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Jul 23, 2015
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doesn't change that fact that a high speed hdmi cable is required to get 60Hz at 4k, with my setup if i use an older HDMI cable i get no picture, if i use the black HDMI cable that is marked high speed that came with my PS4 i get 4K @ 60Hz. I would really like to know what happens when the machine is hooked up directly to the TV set.
 

jmoi308

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Aug 14, 2014
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So, I have it connected straight to the TV as opposed to running it through the Onkyo, and i've been running Wall-E with 3840x2160 at 30Hz. And so far it's not giving me any dots, or flickering screens. I also changed from 3840x2160 to 4096x2160 @ 30 Hz and it's still working without hick ups. So now if I leave my htpc connected straight to the tv, with the same hdmi cable. Would the culprit be the Onkyo ? Could it be a 15-20 ft run ? I have my hub placed about 15-20 ft run from my tv. Or would it be a setting in the Onkyo that needs to be changed ?
 

NeoSpudly

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NeoSpudly

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My guess would be the length of the run I'm not sure how long an HDMI cable can go before signal strength drops it could be a setting but the dots then static to me says signal strength issue
 

jmoi308

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Aug 14, 2014
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So I guess I'm going to disconnect my Onky to see if it's just the LONG run. If not I'm going to ha e to get the Onkyo repaired. Thank You EVERYONE for the help. This is my go to place. If I could I would suggest that all answers would be the best.
 

grimakis

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Sep 29, 2015
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Were you able to confirm if both of your cables supported the High Speed spec? I assume there are 2 HDMI cables involved. One from PC to receiver and one from receiver to TV.

Do both HDMI cables work when connected directly from PC to TV? If one is the older spec cable, you may be in trouble.
 

jmoi308

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Aug 14, 2014
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So I guess the cables do make a difference. The Cable that was leaving the Onky out puting to the tv was a 1.3 hdmi cable = /. But was not the culprit, now with all my theatre guts out and about, I only have the pc connected wit a High spped cable, and the Onkyo to the tv with a high speed cable and i get the dots again, but no flickering. So now, im going disconect the Onkyo and see if the long run is the culprit. Or it could be the cable thats used for the long run = (
 

jmoi308

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Aug 14, 2014
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So after disconecting my Onkyo from all of its speakers, and moved it from the hub closer to the tv with the correct cables, everything LOOKS GREAT with the i5 4460 set to 4096x2160 @ 30Hz. The culprit must be the 15-20ft hdmi run. Or the cable thats used for the 15-20ft run is not High Speed. I'm just glad its not the Onkyo of the PC. Thanks again to everyone for all your help.
 

dudio

Honorable
Glad you got somewhere with that. Just an FYI, from what I read 50' seems to be the maximum length recommended for an HDMI run.
Also curious if you can get your setup to run at 60 Hz instead of 30.
 

jmoi308

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Aug 14, 2014
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So now my next question would be, if I connect my PC straight to the the TV, and leave my Onky in tje hub would I still get ATMOS, would I be losing the option for my Onkyo to do the sound decoding and the TV would take over the sound decoding ?
 

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