PC to TV with HDMI - lots of 'noise'

[smithyithy]

Asking for a friend who's currently without internet.

So he has two TV's - one in his living room, the other in his bedroom.

At the living room TV is his PC, Xbox and Sky box, all connected by HDMI.

He then has a HDMI cable running from his bedroom TV, into his living room and behind the living room TV, so if he wants to watch Sky or play Xbox from the bedroom, he just swaps the HDMI cable, and goes in the bedroom.

The Sky and Xbox work fine, however when he connects his bedroom TV to the PC, he gets a lot of 'noise' in the black areas of the screen. His graphics card also has a DVI connection, so he also tried connecting the HDMI cable to that via a DVI>HDMI adaptor, and he's still getting lots of noise.

Again, the Sky and Xbox work fine via the bedroom HDMI, and the Sky, Xbox and PC all work fine to the living room TV they are stationed at.

The only issue is with the PC to bedroom HDMI connection.

Any ideas what it could be, interference of some kind?

Any help welcome, I'm speaking to him via text so will have to relay messages back and forth..

[Matt141980]

Afraid I can't help but I would be interested in the answer as I've got exactly the same problem. Mine is fine via VGA but gets small green "speckles" on any black parts of the screen when connected via HDMI. Sky is fine via the same HDMI cable.

[LeoSayer]

First thing to try is a different HDMI lead.

[callmedave]

Try a different hdmi in on the TV. If sky is hdmi one and the PC is 3, swap them over and check the results.
Also check the graphics card is installed correctly and has the most up to date driver.

[Durzel]

Sky and Xbox would I suspect be using lower resolutions than a typical PC does.

I don't think Sky even does 1080p, only 1080i, and even the current Xbox One can't do it, much less the original.

Perhaps the cable length coupled with the additional bandwidth requirement of 1080p (assuming that's what he's doing on his PC & TVs) is exposing this noise?

[entropy]

Change TV aspect ratio 1:1 or 'Just Scan' option if there is one.

Graphics card settings and reduce scaling to zero.

[smithyithy]

Cheers guys, managed to sort it apparently - something to so with the refresh rate within the graphics settings.

[jamesu]

Hi guys,

OP's friend here...

TV in the living room is a decent enough (5 year old) Samsung - The TV in the bedroom is a Tesco Special Technika (Full 1080p though, apparently)

Anyway, never had this issue with my old graphics card, it's only since i upgraded a few things in my PC, card included, that i had this issue come up.

It seems to be fixed:

I went into my AMD Catalyst Control Center > My Digital Flat Panels and it shows my Samsung as being on 75Hz refresh rate.

I really have no idea what any of this means, but i went into the HDTV Support tab and changed it when it was plugged into my bedroom TV to something like 720p50 standard (1280 x 720 @ 50Hz) or 1080p30 Standard (1920 x 1080 @ 30Hz) - and it seemed to fix it.

Does this sound correct?

Is there a way i can set it to switch between these settings when i unplug one HDMI and plug the other in? So i don't have to remote onto my PC whenever i switch?


Thanks to all that replied with help - I appreciate it.