ATI 3870 HDMI audio problems no sound help!

Hi, Im looking to hook up my Pc to my TV via HDMI and since I have an HD 3870 in the pc id like to have the audio routed through it as well (which it is supposed to be able to do). I am using the integrated realtek audio and a Sapphire Hd 3870 to a 46 inch Sony bravia TV. I have used the provided DVI to HDMI adapter from ATI and all the connections are correct. There is no sound....

I have installed the realtek HDMI out drivers and under my sound control panel in vista I see Regular speakers, Digital output, and ATI HDMI output. However, I am unable to select the HDMI option as my default and it says it is not plugged in, it automatically sets Digital output as my default and shows that it is playing but again no sound comes out of the TV speakers (which are correctly configured). I am so absolutely lost, latest drivers are installed, someone tell me what im doing wrong.

The motherboard has integrated video and the bios has audio over HDMI option but I have disabled it because im quite certain it refers to the integrated audio (also disabled). Any help would be appreciated.

Use the ATI HDMI output as the default Windows sound device.

DVI only does video no sound. So if you use a dvi to hdmi you will only get video at one source. You need hdmi to hdmi for both video and sound.

1. make sure you use the correct DVI to HDMI adapter that came with your box. E.g the one that comes with 4870 will not work with 2400 or 2600.

2. I have ATI 4870 and had HDMI audio drop problem previously. I was able to resolve the problem by disabling the ATI external event utility service in services.msc, read below for details. It really works:
http://www.avsforum.com/avs-vb/sho [...] stcount=27

i also have this problem the only difference being that my version of the HD 3870 has a HDMI out built in

I had the same problem
Make sure you have hdmi to hdmi and the adapter(dvi to dvi or dvi to hdmi does not carry sound)
I found that if in device manager you enable show hidden hardware, the ATI device shows and you update the drivers from the windows website it will work. Not sure how this worked but i promise you it did !!
Installing realtek drivers does work if you have a realtek onboard.

I talked to Diamond Multimedia tech support this morning got the following response when i asked why 3rd party converter dont pass the audio.

"There is a chip inside the (From ATi)DVI-HDMI converter to PASS both video and Audio".

I requested an extra converter and Diamond is to ship me another connector.

I also tried to use the DVI-HDMI converter from BFG. When using GTX-280 i can get Video and Audio through HDMI. But when i use the BFG connector(DVI to HDMI) on 4890 only the video gets through.

So to date in my case to get audio/video on HDMI is to use ATI supplied DVI-HDMI converter/connector. Using other connector only video is pass through the HDTV.

I have not done this, but my reading says ATI cards are different from others in that they DO make audio signals available at the DVI connector so that using their adapter to create the HDMI connection does provide audio on the HDMI lines. However, there's also the question of where that audio signal comes from. I understand that some ATI video cards with this feature do NOT create any audio. Instead there is an included separate cable that merely connects the signal from the mobo's audio pinout connector to the ATI video card so it can be passed through to the DVI / HDMI output. Don't know about your card, but check if you need to use such a cable.