Introduction: How to Convert an Nvidia Video Card DVI Output to HDMI With Audio for HTPC

In this Instructable I will show how to convert the DVI output on your Nvidia video card to an HDMI output that will carry sound to your HTPC.   Simply using an DVI-HDMI adapter is enough to get video output to your television but if you want the sound to work as well their are a couple extra steps required.  While I was undertaking this project I had a hard time finding all the information I needed in one place so this is my attempt to make it easier for others in the same situation.

Step 1: Parts

To complete this task you will need:

Parts:

Video card with DVI output and an internal S/PDIF connector

2-pin Internal S/PDIF Digital Audio Cable or  2 Female to Female header cables

DVI to HDMI adapter or cable

TV with and HDMI port

Tools:

You may find it useful to have a set of screwdrivers and a multimeter for this project but they may not be necessary depending on your case.

Step 2: Step One: Find the S/PDIF Header and Pinout

The first thing you need to do is locate the S/PDIF headers on your motherboard and video card. 

I have provided some pictures to assist with this although some motherboards have different S/PDIF headers.  

After identifying the headers you will need to determine the S/PDIF and Ground pins on the motherboard.  Some motherboards will have this labeled or can be found in the manual or online but others like mine are not.  This is where the multimeter may come in handy. With the PC power on you will need to test the pins to determine which is which.  The header on my motherboard had 3 pins:  S/PDIF,   ground, and a constant 5v.  The ones you are looking for are the S/PDIF and ground.  You can find ground by setting your multimeter to DC and putting the black lead on your case and testing the pins on the header with the other.  The ground pin will read as 0 volts and the S/PDIF pin should read at  around .01.  As far as I have found the S/PDIF pin is located in the center but as long as you have your meter out you might as well make sure your setup is the same.  Be careful not to touch two pins at the same time.

Step 3: Connect the S/PDIF Cable and Hook PC to TV

The next step is to connect the S/PDIF from the motherboard to your video card. 

Power off your PC and attach your S/PDIF cable to your the jack on your video card an the header on your motherboard.  The red wire should go to S/PDIF and the black wire should go to ground. These were marked on the S/PDIF cable that I bought. 

Attach your adapter to your DVI port if you are using one and hook your HDMI cable up from your PC to your TV.

Step 4: Configure PC for HDMI Audio Output

You may need to configure your motherboard BIOS for HDMI Audio.  On mine I had to set the Onboard Audio from "Auto" to "Enable" in order for HDMI to show up. 

After your PC boots up you will then need to select HDMI from the list of playback devices. 

At this point everything should be working and you should be getting audio from your DVI output to your TV.

Comments

author
PavelT9 made it! (author)2015-12-03

Awesome instructions, fixed my problem. Bought my cable from aliexpress(http://www.aliexpress.com/item/2-Pin-Video-Graphics-Card-HDMI-SPDIF-Audio-Cable-A058/32266726581.html). Its same like justin S64 posted in the comment. The 2 little pins(black ones) went in my motherboard,but not in the white plastic spot like in the tutorial (cos its for 3 pins my cable had 2), there was place for em just next to the white spot.Maybe i should have put 2 of em in the 3 slots but idk, it works like this. If it dont work swith the position of the black pins, did the work for me. Hope i help someone. Stay awesome guys :)

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author
JustinS64 (author)2015-10-22

would this cable work?

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author
darkcheops (author)JustinS642015-10-22

Yes that looks almost exactly like the one I used. Just make sure the white connector will fit in your graphics card.

author
JustinS64 (author)darkcheops2015-10-23

does it matter that my video card is ATI and not Nvidia?

author
darkcheops (author)JustinS642015-10-23

The ATI card I have does not require a cable to pass sound through at all but it also has a built in HDMI port. You may need to do some research on your particular card to see what is necessary to get it to work. I'm not as familiar with them.

author
JustinS64 (author)darkcheops2015-10-23

this should do it, no? http://www.dhgate.com/product/ati-radeon-dvi-male-to-hdmi-female-video/253681488.html

author
darkcheops (author)JustinS642015-10-23

Yea that should work, this is the one that I used.

http://www.amazon.com/gp/product/B0035B4LJM?psc=1&...

What video card do you have?

author
JustinS64 (author)darkcheops2015-10-23

its 2 DVI ports.... my DVI-HDMI converter doesnt seem to carry the sound. There must be some converters that do?

author
JustinS64 (author)JustinS642015-10-22

2 Pin nVIDIA Video Graphics Card HDMI SPDIF Audio Cable new BE

author
EdC5 (author)2014-11-22

Will this setup pass through 5.1 or 7.1 audio?

author
darkcheops (author)EdC52014-11-23

I'm not entirely sure. From what I have read people are using it for that purpose but I don't have a surround sound system to test it on.

author
bobbyT1 (author)2014-10-22

Just wanted to say thanks for this great write up!

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