No Audio with PC to TV via DVItoHDMI + 3.5mm Audio

[stardotc]

Objective
http://oi53.tinypic.com/mb0k6p.jpg

Problem
Video is fine but no Audio.

Setup
Motherboard: Intel BOXDG41MJ
CPU: Intel E5400
RAM: Mushkin 2x2GB PC2 6400
OS: Win 7 Ultimate 64
TV: LG 32lh40

Drivers All from Intel site
Chipset - 9.1.2.1008
Audio - 6196
Video - 15.17.10.2189
BIOS - 0007

Some stuff I tried/noticed
- Unplugging HDMI produces sound. Plugging it back in, makes the sound go away again.
- Plugged in my Macbook (Intel GMA 950 chipset) with exact same wires (DVI + Audio) and got Video and Audio to work.
- VGA + 3.5mm Audio works as well but can not get a good resolution
- Talked to LG people. They blame it on PC.
- Talked to Intel people. They blame it on TV.

Here's what I think is happening ... For some reason LG TV sees an AUDIO signal over HDMI and does not switch to RGB/DVI IN input. Meaning, G41 Chipset is sending something that makes LG believe there's AUDIO on the line.

There're some tutorials that advise overwriting EDID/CEA data to disable CEA portion (which carries Audio settings among other things). I've tried that and it didn't do much.

I find it interesting that the older Intel GMA 950 chipset is properly handling the data where the newer G41 chipset is screwing it up somehow. Although this is most likely the driver/OS/something software related.

I'm definitely running out of ideas and I googling didn't produce anything constructive. Any ideas/suggestions?

 

[d4a2n0k]

DVI-D can pass audio if the hardware is setup for it and if drivers are written for it. When you right click on the speaker near your clock, what is listed on playback devices?

 

[stardotc]

DVI-D can pass audio if the hardware is setup for it and if drivers are written for it. When you right click on the speaker near your clock, what is listed on playback devices?

Intel tech support mentioned that G41 chipset will not be able to pass Audio via DVI.

Under Playback Devices I have only one entry:
------
Speakers
High Definition Audio Device
Default Device
------

 

[cusideabelincoln]

Well you can try using VGA.

 

[Sickamore]

I know in other for you to get audio coming out from your speakers. You need to go through the menu of the tv to change the source of the audio from going in to out. Its there look for it.

 

[d4a2n0k]

Just did some googling and found a few other people with the same problem. It doesnt seem to be isolated to your chipset either, so it looks like its an Intel thing. Everybody had the same conclusion, the Intel boards are sending some sort of signal down the line that makes the TV think there is audio when there is not. You might have to get a cheap ATI card with HDMI out. Sorry.....

 

[stardotc]

I know in other for you to get audio coming out from your speakers. You need to go through the menu of the tv to change the source of the audio from going in to out. Its there look for it.

Unfortunately I was unable to locate anything that has to do with Audio Input in TV's menu.

Just did some googling and found a few other people with the same problem. It doesnt seem to be isolated to your chipset either, so it looks like its an Intel thing. Everybody had the same conclusion, the Intel boards are sending some sort of signal down the line that makes the TV think there is audio when there is not. You might have to get a cheap ATI card with HDMI out. Sorry.....

Thanks for checking into it. I'll have to bug Intel people again as everything points to them. Hopefully I'll get some relevant information this time.

 

[Rifter]

some TV's, like my sony Bravia, will not let you input a digital video signal and analog audio and then output them at the same time. I can run from a PC just fine as long as it passes audio over the HDMI cable, if it does not i am forced to use VGA for the video if i want to use 3.5mm for the audio. I am unable to run HDMI with no audio and then use the 3.5mm audio input at the same time. I dont think this is uncommon for TV's so your best bet is to find a way to get the audio to the HDMI cable even if it means buying a cheap($30) video card.

 

[stardotc]

some TV's, like my sony Bravia, will not let you input a digital video signal and analog audio and then output them at the same time. I can run from a PC just fine as long as it passes audio over the HDMI cable, if it does not i am forced to use VGA for the video if i want to use 3.5mm for the audio. I am unable to run HDMI with no audio and then use the 3.5mm audio input at the same time. I dont think this is uncommon for TV's so your best bet is to find a way to get the audio to the HDMI cable even if it means buying a cheap($30) video card.

LG 32lh40 can handle digital video signal and analog audio inputs and produce a single output. This type of connection is supported and I got it to work using my MacBook (DVIto HDMI + Analog Audio).

 

[stardotc]

Here's what I gathered from another chat with Intel people ...

G41 chipset actually supports sending Audio data over DVI/HDMI. However the motherboard lacks controller that forces the sound card to send its data to the chipset. Thus G41 just blindly sends nothingness over DVI/HDMI. TV thinks there's actually Audio Data on the channel and plays it ... In reality, there's nothing there and thus sound does not work.

Concerning older GMA 950 chipset ...
The Express chipset does not have a native HDMI support and does not care about Audio and only sends Video signal over DVI/HDMI. Since there's no Audio data over HDMI, TV automatically looks for an Audio input on any supported channel (in my case it's RGB/DVI IN) and if there's something there, it plays it.

Which is why my MacBook is able to take advantage using this setup and G41 based PC is not.

I can't even get a cheap HDMI card due to lack of PCI-E ... the only PCI slot is occupied as well. Oh well, no luck to be had.

Hope this provides some answers/closure to people Googling this stuff.

P.S. Anyone know how to hack G41 chipset and tell it to STFU with its Audio portion?

 

[cusideabelincoln]

You could get a VGA cable and try VGA instead of DVI to HDMI.

There are PCI video cards available:
http://www.newegg.com/Product/Produc...82E16814102846

 

[stardotc]

You could get a VGA cable and try VGA instead of DVI to HDMI.

As stated in my original post, VGA + Audio works but the image size/alignment is screwed up. But, more importantly, I just want to get DVI + Audio to work

There are PCI video cards available:
http://www.newegg.com/Product/Produc...82E16814102846

Thanks for the link. My only PCI slot is occupied by non-graphics card.

This is more of a technical research (finding a solution) on a specific problem than finding a workaround.