AVS Forum banner
1 - 20 of 27 Posts

·
Registered
Joined
·
127 Posts
Discussion Starter · #1 ·
So here is a new problem that I have not solved yet.


On the Bravia 4100 LCD 40 there are 4 HDMI inputs.


I want to use the LCD as my PC desktop and with help from members here I have that looking good, the video part.


Well the Bravia's 4th HDMI input has separate audio inputs, designed per the manual specifically for those wanting to input pc audio when using DVI-HDMI from a PC.


Problem is, as soon as I plug in that DVI-HDMI cable, it cuts the audio. Meaning if I plug in audio cables in first, without the HDMI connected, I hear audio. Then when I plug in the video (HDMI) it cuts the audio.


1st I tired a DVI-HDMI adaptor end and it cut the audio, then I got a specific cable DVI-HDMI, it cuts the audio.


There is no setting or configuration I can find anywhere to fix this issue.


Does anyone here have any ideas or suggestions?


 

·
Registered
Joined
·
12 Posts
I have got exactly the same problem.

Sorry I can't give a solution as I have not found anybody that can help me either.

I have a Sony Bravia KLV-32S310 and a Chaintec 8800GT graphics card.


The only logical solution that I can come up with is that my 8800GT puts a "empty audio signal" on the DVI-out and then the Sony detects this audio and therefore cuts out the Audio-In (L/R)


The strange thing is, I had a Gigabyte 6600GT graphics card and the exact same setup worked perfectly.


For the time being I connect my Audio-L/R from the PC to my 5.1 surround system.


I have emailed Chaintec to ask them if it was possible to connect my soundcard to my graphics card internally and this is the response I got from them:

(laughed at the engrish)


"dear sir

please check the S/PDIF do you connect that?

is you want to HMDI out vedio please connect S/PDIF on you vga card"


I have only got this email this morning so I have not tried it yet.

I don't know how I am going to connect the S/PDIF, I have to open up my PC tonight and see if it's possible. I can't remember seeing any headers on the graphics card though.


If you find a solution please post here..
 

·
Registered
Joined
·
12 Posts
In zewt's case the manual instruct him to use HDMI4. In my case it is HDMI2.

I have tried both my HDMI's with no luck.


The guys at the place where I bought my Sony says they don't know what the problem is.

But they said that the HDMI audio is supposed to be the superior. That's why the Sony tries to use that instead of the RCA-source.


That's why I think the problem is on the graphics card side.

I've even tried different versions of Nvidia drivers. e.g 175.19 / 175.16 / 169.something
 

·
Registered
Joined
·
1,769 Posts
IIRC this problem is specific to NVIDIA cards with HDMI audio support.


You are quite correct in your assessment. For whatever reason they insist on sending "blank" audio even when no SPDIF loopback is connected. This isn't a problem with TV's that allow you to manually set either analog or HDMI (digital) audio on the port but is a problem on TVs that auto-select.


AFAIK there isn't a way around this other than (as you've already suggested) seeing if you can connect the SPDIF loopback to enable HDMI audio. What you're looking for is a small two pin connecter somewhere near the top of the card. You need to connect this to either an internal SPDIF header on your motherboard or you the external coaxial SPDIF connector on the back of the board and loop the connection back into the case.


A word of warning. The motherboard header will probably have three pins. Do not connect anything to the pin labelled +5V. You want to use the other two pins. One will be the signal the other ground.


Hope this helps.


Wo0zy
 

·
Registered
Joined
·
12 Posts
Thanks woozy, I will try this when I get home.

I think I did see two pins on the graphics card.

What kind of cables will I need to do this.

( Can I try to vulture some of those cables that connect the reset/powerswitch/hdd-led to the mobo )

Should I connect this to the motherboard or the soundcard?
 

·
Registered
Joined
·
1,769 Posts
Last time I did it, I harvested bits from an old USB header cable. Guess you could use just about anything that has the type of connector that you can push on to the pins. Just make sure they're a snug fit and the signal and ground are isolated. The cables that come with come of the NVIDIA cards are pretty thin so I wouldn't worry too much about the gauge of the wire.


If you have a soundcard fitted and enabled as your default playback device AND it has an SPDIF header then connect it to this. If the soundcard doesn't have an SPDIF header but your motherboard does then it would be worth enabling the onboard audio and using that instead. What type of soundcard do you have?


Wo0zy
 

·
Registered
Joined
·
12 Posts
I've got a Creative Soundblaster live 7.1 card.

I'd prefer to use that than the onboard.

I'm not at my pc yet, so I'll have to check tonight if there is a SPDIF header on the soundcard.


Thanks for the help.

I'll post here if it works.
 

·
Registered
Joined
·
127 Posts
Discussion Starter · #9 ·

Quote:
Originally Posted by kapone /forum/post/14188481


Have you tried plugging the PC's DVI--> HDMI into HDMI 1/2/3 on your TV?

Yes I tried all the HDMI inputs.


I also tried three different DVI cables, and an adapter.
 

·
Registered
Joined
·
127 Posts
Discussion Starter · #10 ·

Quote:
Originally Posted by Wo0zy /forum/post/14188645


IIRC this problem is specific to NVIDIA cards with HDMI audio support.


You are quite correct in your assessment. For whatever reason they insist on sending "blank" audio even when no SPDIF loopback is connected. This isn't a problem with TV's that allow you to manually set either analog or HDMI (digital) audio on the port but is a problem on TVs that auto-select.


AFAIK there isn't a way around this other than (as you've already suggested) seeing if you can connect the SPDIF loopback to enable HDMI audio. What you're looking for is a small two pin connecter somewhere near the top of the card. You need to connect this to either an internal SPDIF header on your motherboard or you the external coaxial SPDIF connector on the back of the board and loop the connection back into the case.


A word of warning. The motherboard header will probably have three pins. Do not connect anything to the pin labelled +5V. You want to use the other two pins. One will be the signal the other ground.


Hope this helps.


Wo0zy

My Nvidia card does not have have an HDMI output, I am using DVI, how is that affecting audio?
 

·
Registered
Joined
·
16,749 Posts
Zewt,

DVI stands for Digital Video Interface and therfore the DVI standard has no provision for any audio signals.

One of the HDMI inputs on your TV most likely supports standard stereo audio which can support R&W RCA audio cable coming from the standard audio output of your PC.

ATI does have some graphic cards that can send both DVI and digital audio from a DVI_I connector on the card and the card comes with a special DVI-HDMI adapter that sends both video and digital audio in accordance with the HDMI standard.
 

·
Registered
Joined
·
127 Posts
Discussion Starter · #12 ·

Quote:
Originally Posted by walford /forum/post/14191989


Zewt,

DVI stands for Digital Video Interface and therfore the DVI standard has no provision for any audio signals.

One of the HDMI inputs on your TV most likely supports standard stereo audio which can support R&W RCA audio cable coming from the standard audio output of your PC.

ATI does have some graphic cards that can send both DVI and digital audio from a DVI_I connector on the card and the card comes with a special DVI-HDMI adapter that sends both video and digital audio in accordance with the HDMI standard.

I'm not sure if you read the entire thread. I know what a DVI cable is, that was why I was asking how it would affect cutting off the audio when plugging in, when of course a DVI cable does not have audio. yet as soon as I plug in the HDMI end of the DVI-HDMI cable, the audio goes dead. Is it the TV cutting the audio? or the Nvidia 9800 GTX? Im guessing its the Bravia LCD, because if I plug that audio into something else I can hear it.


With the configuration I need for this application, using some other audio input is impossible, as the video needs to come from the source via a DVI-HDMI, and the only HDMI input with additional audio inputs was input 4. (See picture in first post)
 

·
Registered
Joined
·
8,926 Posts

Quote:
Originally Posted by walford /forum/post/14191989


Zewt,

DVI stands for Digital Video Interface and therfore the DVI standard has no provision for any audio signals.

One of the HDMI inputs on your TV most likely supports standard stereo audio which can support R&W RCA audio cable coming from the standard audio output of your PC.

ATI does have some graphic cards that can send both DVI and digital audio from a DVI_I connector on the card and the card comes with a special DVI-HDMI adapter that sends both video and digital audio in accordance with the HDMI standard.

True the DVI standard has no provision for Audio. However, there is nothing stopping a DVI Cable from carrying the full 7.1 lossless audio signal. Just check out this little device from Gefen.

http://www.gefen.com/kvm/product.jsp?prod_id=4715


It is a DVI only device. However, it can pass audio through it. In fact, it is the only thing that will currently allow the ATI cards to pass audio through to a Yamaha receiver.
 

·
Registered
Joined
·
16,749 Posts
Zewt,

Does your TV not have a setup option to say what audio source you are using for HDMI 4 since AFAIK it can accept either one?
 

·
Registered
Joined
·
7,056 Posts
step 1:

Go into device manager, find the nvidia HDMI audio controller under sound devices and disable it.


step 2:

??????????


step 3:

PROFIT
 

·
Registered
Joined
·
1,769 Posts

Quote:
Originally Posted by sotti /forum/post/14193373


step 1:

Go into device manager, find the nvidia HDMI audio controller under sound devices and disable it.


step 2:

??????????


step 3:

PROFIT

Step 1 doesn't apply to discrete NVIDIA solutions with "HDMI Audio" support. Only IGPs.


Wo0zy
 

·
Registered
Joined
·
1,769 Posts

Quote:
Originally Posted by mpgxsvcd /forum/post/14192513


True the DVI standard has no provision for Audio. However, there is nothing stopping a DVI Cable from carrying the full 7.1 lossless audio signal.

Well said. People get blinded by the fact that the DVI specification doesn't include audio and forget that single link DVI and HDMI are pin compatible. Whether or not audio is "stuffed" between video frames is a matter of choice for source equipment.


SOME nvidia cards do in fact support HDMI audio via a DVI interface without special dongles (as used by ATI). Granted, this is limited to SPDIF supported protocols and therefore is limited to 2-channel LPCM and AC-3 but it does work using standard DVI>HDMI connections.


Wo0zy
 

·
Registered
Joined
·
127 Posts
Discussion Starter · #20 ·
There was no setting in the Bravia to allow for modifying the audio input/outputs. I tried everything I could find. It is very limited in that capacity.


This is the card I am using: http://www.evga.com/products/moreInf...512-P3-N875-AR


It does have that small 2-wire connector on the top, but I have never seen any documentation describing what it actually is and how to use it.


I tried a number of DVI-HDMI cables, most monitor DVI cables these days do not come fully pinned, meaning they only have the pins associated with carrying the video signal. (why waste copper on wires that are not needed eh?)


So I have no idea how this HDMI port was able to "sense" audio.
 
1 - 20 of 27 Posts
Top