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PC DVI to TV HDMI problems
Aldros 
30/7/08 4:34:14 PM
Serf
Hi Guys,

I'm currently running an ATI Radeon 4850 graphics card on a GA-EP45-DS3 mobo with a 3.0GHz dual core processor and 4GB of ram, housed horizontal in a Silverstone case.

My mission was set to up a media centre style pc that would connect to my Sony KDL-32V2000 LCD TV using a digital signal, not the analog VGA. I assumed that because my TV has HDMI in, it would happily accept the digital signal from my ATi 4850 using a DVI to HMDI converter as the only output on my graphics card is DVI.

Unfortunately, strange things happen when I try to connect my PC via DVI to the TV's HDMI socket. The image looks very vibrant but seems out of register, blurry and basically displays an unacceptable image and a non 1-to1 pixel map. I have tried adjusting screen resolutions both in the Catalyst app and "Display" in Windows control panel. I have read that there is an issue with trying to display a 1360 x 768 image digitally and have even tried 720p (1280x720) but with much the same result.

Using DVI to VGA on the TV looks fine though it somewhat seems like a waste of potential and is rather an archaic method.

After reading the Sony TV manual it clearly states the only way to plug your PC into the TV is via VGA as the PC signal is RGB not YCbCr.

So why is the HDMI input there then? Oh, it was only designed to accept signals from PS3s and DVD players...good one Sony!

My questions are:

Is there a way to trick the TV into thinking it's receiving a YCbCr signal from the DVI out graphics card? Possibly an additional application or driver of some kind?

Has anyone else had the same issue and managed to resolve it?

It is stated that the ATI 4850 comes with a "special dvi to hdmi adapter". Is it really a special adapter or just a standard DVI to HMDI adapter?


Any help with these questions would be much appreciated and hope I haven't been too long winded.

Cheers


Edited by Aldros: 31/7/2008 11:10:46 AM

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Aldros 
1/8/08 2:00:53 PM
Serf
I presume the below applies to my problem. Props go out to red2grass at AV Science Forum.

"To answer your problem, Samsung LCD tv (I have 4092d)'s HDMI port does not support PC connection. You are much better off to use VGA connector get to 1:1 pixal mapping on 1366x768 or 1920x1080(if you have 1080pm models).
As someone on the other thread pointed out, the HDMI port is designed for CE devices such as set top boxes or HD dvd players and it only supports two resolutions 1280x720 and 1920x1080. That probably explains why only 1280x720 works on it. You can't get its native 1366x768 so you picture quality will be inferior. One more issue is that the HDMI port overscans the incoming video, so you will get a zoomed in frame and lose 5 - 15% of screen area. Some nvidia drivers will let you counter the overscan to gain back the lost area but you will end up with a weird resolution and most likely your picture quality will suffer.
The bottom line is that the HDMI port on Samsung LCD simply does not work with DVI. I settled with VGA and the picture quality is awesome. Until someday Samsung and Nvidia both get the new "DisplayPort " which is of course 100% digital and has plug and play for digital TV in mind, I have to stay with VGA. Both Samsung and Nvidia and ATI (AMD) are in the "DisplayPort" camp so this will come true within a couple of years."



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-80 
3/8/08 10:40:21 PM
Banned

It's usually a standard adapter......but that mean that it's going to work.
In my experience anyway.
HDMI is a right royal pain in the arse!

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Mercury - you've got my number

Aldros 
4/8/08 10:02:31 AM
Serf
Too right!

I have managed to get a signal running from my pc via HDMI at 1080i (1360x768) though the desktop picture and text look terrible, again as if it is out of register(text is haloed and burry). When I play PES 2008 however, it locks in to 720p (1280x720) and the game looks great! Playing HD .mkv files also look really good.

So in summary I've found that the HDMI connection from the PC works for gaming and HD movie playback though for normal desktop computing, DVI to VGA is the go.

Now that's a pain in the arse.


Edited by Aldros: 4/8/2008 12:23:33 PM

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Jedi_Vader20 
6/8/08 7:03:47 PM
Champion

Had no issues hooking my sister's HTPC (with an ancient Radeon 9250) up to her new 1080p Samsung LCD TV, apart from needing to install proper drivers for the card.

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<.<
>.>
*shrug*

Aldros 
7/8/08 3:58:35 PM
Serf
Quote by Jedi_Vader20
Had no issues hooking my sister's HTPC (with an ancient Radeon 9250) up to her new 1080p Samsung LCD TV, apart from needing to install proper drivers for the card.



What I can't get my head around is why the VGA connection looks so much better than the DVI one, when both are displaying the same resolution, 1360x768.

I have a feeling newer generation TVs (full HD 1080p) don't have the same problems as the old sudo HD 1080i TVs like mine. 1366x760 TVs have to display that resolution at 1360x768, I think this where the problem is as opposed to you sister's TV which gets a 1 to 1 pixel map: 1920x1080

Thanks for the feed back

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Cpt. Lock 
7/8/08 7:25:08 PM
Banned

So wait is your TV 1080i or 1080p?

Have you tried the different 1080i resoloutions in the catalyst control centre, there should be 1080i, and 1080p as well as PAL, and NTSC.

Have you made sure that, that is all correct?

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The Fuzz damn you! 
10/8/08 12:18:25 PM
Mod
Hero

Immortal


Why all this fussing around? What not just use VGA? It's the same damn signal that gets thrown up there on the screen -- go for the one that actually works. Either that, or grab a proper 1080p TV and go nuts with the HDMI. Only go for HDMI, though, if it's going to provide something better -- just because it's newer and all fancy and digital, doesn't mean you're going to get a superior picture on your screen (as you've found out).

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Aldros 
12/8/08 10:32:40 AM
Serf
The Fuzz damn you!,

HD movies files and games look great via DVI on my set up. Colour, render detail and sharpness are all superior to using the VGA connection.

Again, the problem is VGA displays a 1:1 pixel, so yes my desk top image looks better than using DVI to HDMI. But my TV's native resolution is 1366x760 not 1360x768 which is 1080i. I've tried overscanning and scaling in the ATI Catalyst app but the digital signal only works from presets like 1080i @ 60Hz PAL.

I tested my PC DVI connection on a 1600x1024 LCD TV and it looked great at it's native rez. Text nice and sharp and games even better.

My solution, piss the sudo HD TV off and buy a proper HD 1080p LCD and run it at 1920x1080.

Thanks for the comments

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The Fuzz damn you! 
14/8/08 4:11:34 PM
Mod
Hero

Immortal


Quote by Aldros
The Fuzz damn you!,

HD movies files and games look great via DVI on my set up. Colour, render detail and sharpness are all superior to using the VGA connection.


Are you sure? You sure you're not just seeing what you expect to be there?

My solution, piss the sudo HD TV off and buy a proper HD 1080p LCD and run it at 1920x1080.

Yeah, an excellent idea. This is the reason I waited until I could grab a 1080p display for jumping to HD.

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You are about to begin reading The Fuzz's .sig. Relax. Concentrate. Dispel every other thought.
.....|...
..\...../
-- o o -- <<...steam from a piston covers the opening of the chapter...>>
../.....\
.._|..|_

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