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Connecting DVI to HDTV

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Old 06-03-2009, 01:10 PM   #196  
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Originally Posted by rbinck View Post
I get PMs and questions about connecting a computer video card output to an HDTV quite often. It came to me that a series of threads that deal with this proceedure and the issues involved would be helpful. This thread will deal with the connecting of a computer video card with DVI outputs to an HDTV with a DVI input.

Also for you strictly technical guys out there, I do take a little poetic license to try and simplify the subject somewhat.

Introduction
The reason many TV manufacturers include a DVI connection in addition to component video was not to allow the connection of a computer. The main reason was to allow the exchange of video information in a digital format rather than analog. The DVI interface came into being due to the LCD and plasma flat panel computer monitors and projectors, and later DLP and LCOS (D-ILA) displays and projectors. Since these are fixed pixel devices an interface that would present a digital value for each pixel rather than an analog signal level made sense.

The DVI interface answered the question of, "Why start out with a digital array of pixel values then convert them to an analog signal to send to a monitor only to have the analog signal reconverted back to digital?" With the DVI interface the possibility of the signal remaining all digital is possible.

The DVI interface was also given interaction capabilities between the video card and the monitor. This allowed the computer to inquire of the monitor what the resolution and timing that it supported and then via software in the computer set the video output accordingly. This capability is actually the essence of the DVI interface, the ability to tell the source what signals the monitor will display. The earliest DVI-I interfaces were actually just VGA analog signals with the digital link to allow the information to be exchanged between the computer and the monitor. There is a cable available to convert a DVI-I output from a video card to a VGA input on a monitor.

The DVI connection that is most desirable for fixed pixel devices is the DVI-D, dual link connection. This is the connection that most HDTV manufacturers use primarily for compatibility reasons.

Adoption of DVI for HDTV Signals
Since the computer was able to ask the monitor to supply information concerning its signal capabilities, as well as other information, the consumer electronics industry saw this interface (and later the HDMI) as a possible answer to the copy protection issue that had prevented HD movies from being made available for broadcast in HDTV. The entertainment industries were concerned with copy protection and insisted on a method of preventing cloning of their movies. The HDCP protocol was developed and the DVI became the first interface to have HDPC implemented. This allowed the broadcasters to "raise the HDCP flag" that would prevent a recording device connected to the DVI output from recording by shutting off the output. As long as a monitor only device was connected the output was enabled.

Computer Output Compatibility
Many people think that because there is a DVI connection on their HDTV that it should be a matter of connecting a DVI cable between the two and presto! We have computer video on our HDTV screen. Well I'm sorry to say this is not the always the case, in fact rarely.

There are exceptions to this, primarily plasma, LCD displays and projectors. These are generally higher cost display units that are built with the connection of a computer in mind, but most HDTVs are not built with the connection of a computer. Computer monitors today will accept a vast range of video signals. Refresh rates from 50Hz to 120Hz are typical for most computer monitors, whereas most HDTVs will only handle 59 to 61Hz refresh rates. Horizontal scan ranges are also reduced compared to a computer monitor. Here is my HDTV information returned by MonInfo, a utility that can be downloaded and run to get information from your HDTV via the DVI connection:

Note that the 30Hz indicates these are interlaced timings.

The reason HDTVs have such narrow response is a cost issue. Most people who buy an HDTV do not want to pay the extra $2k or so required to expand the response to allow the computer timings.

What Is Possible
But there are many reasons to connect your computer to your HDTV, even though it will not be a big screen duplicate of your computer monitor. Slide shows of digital photos, DVD viewing and group web surfing are just some of the possibilities, but I find it will not replace my computer monitor.

To find out what is possible for your HDTV the first step, after the connection of the appropriate DVI cable, would be to download and run MonInfo. This utility will tell you what resolutions your TV will display. I have found that this is not the only resolutions, but the recommended by the manufacturer. For example my LG will also display 1920x540 at 60Hz which is the progressive scan counterpart to the 1920x1080 at 30Hz. It is probably not recommended by LG due to the aspect ratio issues.

It is important to know what is possible for your particular HDTV because serious damage can be done to your HDTV if non viewable signals are sent to your TV. If while trying out different resolutions and timings you hear a high pitched noise from your TV, remove the signal or turn off the TV immediately.

Recommended Steps To Get Started
First of all you will need to have a computer monitor connected as well as your HDTV. Since the majority of resolutions that can be displayed on your monitor will not be displayable on your HDTV, you would be operating blind and that just will not work. Some video cards have both a VGA output and a DVI output and if yours is this type, then you can hook up your monitor to the VGA output. If your computer monitor is a DVI unit then you will need a DVI distribution box, like the DTronics DD-12P, for example.

Start by setting your computer to 640x480 and get a stable picture. This should be no problem. Most likely the 16:9 resolutions of 720x480 and 1920x1080 will not be listed with the standard video drivers. In order to be able to set custom resolutions it will be necessary to download a program called powerstrip, which is available here: PowerStrip - English and the home page to read up on the software is here: http://entechtaiwan.net/util/ps.shtm

Most likely without the powerstrip software you will go no further. Some video cards have some HDTV drivers for their latest and greatest cards, but if you have an older card - 6 months old even - you will need powerstrip. In the end, you may need to get a newer card anyway. Even if you get a newer card that supports HDTV resolutions, you may still need powerstrip to tweak the display to reduce the overscan. See Overscan thread for more information.

This is a fairly complex issue to get your computer connected to your HDTV successfully, but with some persistence it can be done.
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Old 06-24-2009, 08:25 PM   #197  
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have philips 42pfl7404 and when connected to pc there is a black screen coming every 5-30 minutes.(like its trying to change resolution).i have ati hd4650 graphic card. ıs there any one who can help me ?

and also i have tried ati hd 4870 the same problem .im using hdmi to hdim cable
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Old 06-24-2009, 08:35 PM   #198  
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Have you tried DVI to HDMI?
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Old 07-28-2009, 05:28 AM   #199  
What is HD?
 

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Default HDMI graphics card

Sorry about my bad English .
Now i am looking for buy a new desktop computer my configuration given below .
I have some doubts about HD
1.First witch monitor i choose for my desktop
Samsung or benq ( Samsung P2250 :Benq E2200HD) ,
i already find lots of reviews for benq (E2200HD) but i can't find out for Samsung (P2250).
peoples are good response for benq pleas help me ........
two monitors are almost equal prices
2. There is any technical specifications required for graphics card for driving HD display,
i mean only 1GB card drive the display or something (looking only low priced card)
(i am looking for full HD content playing on my computer)
actually now i search only that card has HDMI out i don't know this card drive a true HD display
Please help me...... thanks in advance

Item
Intel processor --Core 2 Duo 2.9 GHz
motherboard --Asus with ati Chipset
Ram-- 2GB
hard disk --500GB C-Gate
DVD Writer-- Samsung
key board and mouse --Microsoft
monitor (HD)-- Benq E2200HD 21.5"
monitor (HD)-- Samsung P2250 21.5"
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Old 08-30-2009, 01:46 AM   #200  
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My TV works fine in 720p (actually 1200x676, it cut the edges off). I guess I just got lucky? This is using a video card that supports TV output via component cables. Perhaps that makes a difference?

All this information is fine and dandy, but I don't see any way of knowing whether a TV will support your computer or not unless you buy it. I guess I'll keep my fingers crossed.

Edit: FYI MonInfo won't work unless connected through DVI I'm assuming. You talk of TV's with DVI inputs, yet out of all the TVs I've looked at, none of them seem to have DVI inputs. They usually have the older VGA input. Is there any loss of quality using a VGA adapter from DVI? Why do they still use VGA?

Last edited by Darktangent; 08-30-2009 at 01:52 AM..
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Old 03-22-2010, 06:32 AM   #201  
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Default Overscan issue with Intel X4500HD and Mitsu WS-55313

Hi, I've read thru this forum and have spent a great deal of time researching this issue, but have not come up with a final issue. Hoping somebody could help me, as my time is limited.

Dell finally shipped my HTPC, or as close as I could come to one:
Inspiron 580 Core i3 with H57 board - G45 chipset with X4500HD integrated graphics, which supposedly works well with Core i3's onboard GPU and has HDMI out.

Unfortunately, my Mistubishi WS-55313 TV does not. I Have HDMI to DVI converter. To my dismay, I mistakingly assumed "MonitorLink" would "link" my "monitor" to my TV. Who knew the TV would be deemed "unsuitable as a computer monitor" by Mitsubishi.

MonitorLink was apprently designed by Mitsu as a proprietary connection for their HD receiver that also incorporated the DVI standard.

DVI signals are decoded differently by a HDTV than a computer encodes it. The result is a pretty nice picture with overscan that crops off all 4 edges of the desktop, which makes the whole thing unusable.

Since I have intel X4500HD integrated graphics, I stumbled upon some info that recommended I use the igfxcfg.exe applet tool to run a custom resolution profile and reduce overscan to "0". No such applet exists on my stystem, even after reinstalling drivers straight from intel, in case Dell's OEM install stripped it out. I can't seem to find igfxcfg.exe on intel's site or anywhere else, other than the free malware sites.

came across this thread and downloaded MonInfo, which is nice to extract the EDID info from my TV. I also downloaded PowerStrip, but I cannot seem to get it configured. I hooked up an additional monitor via VGA. Powerstrip can identify settings for each monitor as I drag its window from one monitor to the other, but I cannot change the max resolution. I found a way to create a custom drive and adjust the fields to match as much info from MonInfo as possible. I can save the .inf, but what do I do with it?

The EDID Powerstrip is auto-extracting is coming up with 1920 x 580. I am at a total loss here. If somebody can walk me through how to get this running, or at least point me to a decent link for intel's configuration tool: igfxcfg.exe, I would appreciate it.

I just got the PC from dell and have a limited time to come up with a fix before I have to decide to send it back or keep a system that is incompatible with my TV.

Thanks.
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Old 03-31-2010, 06:34 AM   #202  
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Default WS-55313 overscan solution

In response to the above post about overscan issues on the mitsu set, it ended up being an issue where the intel media accelerator's integrated graphics were unable to compensate for manual resolution settings.

I installed a GeForce 9500 GT with ForceWare Drivers, which are designed to allow custom resolutions for use with stubborn HDTV's with an average 5-15% overscan. The software implements a function that allows you to use sliders to manually adjust the desktop size of the display on the TV set, which is exactly what I needed.

Now, I can see all sides of the desktop on my WS-55313 Mitsu CRT. I'm running 1080i (contrary to what Mitsubishi said: "you'll only get 1920 x 540 with the MonitorLink DVI input and you can't use a computer with this set") The Nvidia drivers allowed me to manually adjust desktop to something in the realm of 16xx by 9xx

The far sides and corners are still a little blurry, but I think it is more of a convergence thing with the TV. The Nvidia rep says he's running 720p mode with better results, but I can't seem to get it happening. If anybody has any ideas, let me know.
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Old 04-25-2010, 08:22 AM   #203  
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I have a ATI Radeon HD 3800 Series card. My tv has a VGA conector so my connection is DVI to VGA. After setting my video card for the second monitor I recieve the desktop on the tv but nothing else. The idea was to watch movies and play some games with the tv.

Is there something I'm missing in the set-up? I assumed the tv would show "same as" the computer monitor with shortcuts and curser.

Any help is appreciated as I've no idea where to go from here.


Monitor
Model name............... SANYO LCD
Manufacturer............. Sanyo
Plug and Play ID......... SAN0A11
Serial number............ n/a
Manufacture date......... 2009, ISO week 0
-------------------------
EDID revision............ 1.2
Input signal type........ Analog 0.700,0.300 (1.0V p-p)
Sync input support....... Separate
Display type............. RGB color
Screen size.............. 570 x 320 mm (25.7 in)
Power management......... Active off/sleep
Extension blocs.......... None
-------------------------
DDC/CI................... Not supported

Color characteristics
Default color space...... Non-sRGB
Display gamma............ 2.20
Red chromaticity......... Rx 0.640 - Ry 0.329
Green chromaticity....... Gx 0.289 - Gy 0.600
Blue chromaticity........ Bx 0.149 - By 0.060
White point (default).... Wx 0.279 - Wy 0.289
Additional descriptors... None

Timing characteristics
Horizontal scan range.... 30-92kHz
Vertical scan range...... 56-86Hz
Video bandwidth.......... 160MHz
CVT standard............. Not supported
GTF standard............. Not supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 1920x1080p at 60Hz (16:9)
Modeline............... "1920x1080" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync

Standard timings supported
720 x 400p at 70Hz - IBM VGA
640 x 480p at 60Hz - IBM VGA
640 x 480p at 72Hz - VESA
640 x 480p at 75Hz - VESA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
800 x 600p at 72Hz - VESA
800 x 600p at 75Hz - VESA
1024 x 768p at 60Hz - VESA
1024 x 768p at 70Hz - VESA
1024 x 768p at 75Hz - VESA
1280 x 1024p at 75Hz - VESA
1152 x 870p at 75Hz - Apple Mac II

Report information
Date generated........... 4/25/2010
Software revision........ 2.50.0.849
Operating system......... 5.1.2600.2.Service Pack 3

Raw data
00,FF,FF,FF,FF,FF,FF,00,4C,2E,11,0A,01,01,01,01,00 ,13,01,02,08,39,20,78,2A,D2,58,A3,54,4A,99,26,
0F,47,4A,AF,CF,80,01,01,01,01,01,01,01,01,01,01,01 ,01,01,01,01,01,02,3A,80,18,71,38,2D,40,58,2C,
45,00,3A,40,21,00,00,1E,00,00,00,FD,00,38,56,1E,5C ,10,00,0A,20,20,20,20,20,20,00,00,00,FC,00,53,
41,4E,59,4F,20,4C,43,44,0A,20,20,20,00,00,00,FE,00 ,0A,20,20,20,20,20,20,20,20,20,20,20,20,00,C6
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Old 04-25-2010, 08:47 AM   #204  
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Quote:
Originally Posted by mnrob View Post
I have a ATI Radeon HD 3800 Series card. My tv has a VGA conector so my connection is DVI to VGA. After setting my video card for the second monitor I recieve the desktop on the tv but nothing else. The idea was to watch movies and play some games with the tv.

Is there something I'm missing in the set-up? I assumed the tv would show "same as" the computer monitor with shortcuts and curser.
It sounds like you have your catalyst settings to extended desktop. Try changing it to clone mode and also check your AVIVO settings for theater mode.

Question: The 3800 series should have an HDMI output or a dongle for component out. Why aren't you using either for the TV? Reason for asking is your VGA resolutions aren't in tune with the native resolutions on the TV.
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Old 04-25-2010, 10:00 AM   #205  
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Thank you for the help. It took a while to get it to clone mode but works fine now.

So far as the video card, it has two DVI outputs and an S-VIDIO output. Would there be any advantage in using the S-VIDEO out?
Again, Thanks
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Old 04-25-2010, 10:29 AM   #206  
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Originally Posted by mnrob View Post
Thank you for the help. It took a while to get it to clone mode but works fine now.

So far as the video card, it has two DVI outputs and an S-VIDIO output. Would there be any advantage in using the S-VIDEO out?
Again, Thanks
S-video would only give you 480p resolution (720x480), so the VGA is far superior. Are you sure that it's an s-video output as the ATI dongle for component looks the same. If you have an HDMI or component input, monoprice has dvi adapters to either for ATI cards.

If you can tell us the exact make and model of your video card we can give you more specific info.
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Old 04-25-2010, 11:44 AM   #207  
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The video card is a Sapphire Radeon HD 3850.
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Old 04-25-2010, 12:56 PM   #208  
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Originally Posted by mnrob View Post
The video card is a Sapphire Radeon HD 3850.
That card, whether agp or pci-e shows that it should have come with the component/s-video/analog dongle or a dvi/hdmi adapter that would include audio. If you don't have either, I highly suggest getting the hdmi adapter from monoprice. If it's a generic adapter that doesn't have audio, you can just use the same audio you are using for the VGA which is how most tvs are configured.

At that screen size, though a lower resolution won't be as noticable, but you're still better off with the hdmi or component input. At least you have options if you upgrade to a larger screen.
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Old 04-25-2010, 03:12 PM   #209  
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Thank you for your time and effort. I will look into the adapter cable.
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Old 05-24-2010, 02:26 PM   #210  
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TV Sony Bravia KDL-32ML130
CONNECTION VGA from Video Card to the PC input on the TV.
PROBLEM The edges are cut off. No matter which resolution I try, if I maximize a screen, I can't get to the address bar, and I certainly cannot get to the start menu.

I would normally open up a regular monitor's menu and squish it so that the content is within the frame of the monitor...

Anyone know what I can do here?

//EDIT nevermind, I had the thought to check my WIDE MODE, and that did it. Wow, I feel dumb for not checking that before posting.

Last edited by duhimalyse; 05-24-2010 at 02:39 PM..
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