The 5670 has an audio chip but an HDMI cable carries both video and sound.
Are you having trouble playing sound through the TV?
Yes because I can't get the computer to make use of the audio controller on the 5670. It sounds like you have knowledge and familiarity, so I seek your advice.
Problem: No sound through HD5670 video board, only through the main board output port.
I have read many FAQs and support forums over several days and tried everything I have found with no success. Please do not suggest I look at FAQs, I already have.
Much of my system configuration is at the end of this letter, extracted from Belarc Advisor report
I installed the new-out-of-the-box videoboard and driver from the CD. Video is fine.
Purchased 11/2012 though Ebay from Core Web Solutions, NY, Model # 5670-1G S/N PG 1102019959.
From reading in several forums I understand that in the window Control Panel>Sounds and Audio Devices Properties>Audio "AMD HD Audio rear output" should appear as an optional Sound Playback device, and be selectable.
It doesn't. All there is there is "HD audio rear output 2". No options. This I believe is a major symptom. How do I fix it?
However in window Control Panel>Sounds and Audio Devices Properties> Hardware I see both
AMD High Defintion Audio Device and
VIA High Definition Device
Both appear (along with the CD drive and various codes and legacy devices)
Under "Properties" in that window both the AMD and VIA devices are shown as "enabled" and "working properly".
Disabling the VIA device results in "No audio device" in the Control Panel>Sounds and Audio Devices Properties> Audio window and shuts off all sound.
In window Control Panel>Sounds and Audio> Devices>Properties>Hardware>Properties>Properties>Audio Devices>AMD High Definition Audio Device> Properties is the option "Use audio features of this device". No combination of "use audio features" and "Do not use audio features" of the VIA and AMD devices gets the AMD to appear in the Control Panel>Sounds and Audio Devices Properties>Audio window (and create sound?)
Subsequent study in forums tell me that the CCC Catalyst doesn't load an audio driver for the HD5670 board.
I found a download of "ATI HDMI Audio Driver which appears to be what I need(?). I downloaded a folder "8-2_xp32_hdmiaudio_58128" to location C:/ATI/SUPPORT. In that folder is a setup.exe file which if clicked offered to install the driver, and then says it had done it (after I accepted licence conditions).
But after rebooting the system this has not created the device "AMD HD Audio rear output" at Control Panel>Sounds and Audio Devices Properties> Audio.
Then I reinstalled the graphics card drive from the CD using Catalyst hoping it would now find and "pick up" the new audio driver. It made no difference.
Still nothing except "VIA High Definition Device" at Control Panel>Sounds and Audio Devices Properties> Audio.
What do I need to do to get "AMD High Defintion Audio Device" as a selectable option in the Control Panel>Sounds and Audio Devices Properties> Audio window?
I find nothing (from reading and experiment) in the BIOS to explicitly force the system to use the audio on the graphics board.
I understand that the sound does not come out of the HDMI port of the audio board, but out of the DVI port and the DVI-HDMI adaptor was provided in the box. I have been using that adapter.
Ultimately I want to send video and audio to my HDTV HDMI port, but am convinced I am not yet getting any audio out of the HD 5670 card.
Computer Profile Summary extracted from Belarc Advisor
Profile Date: Friday, January 25, 2013 2:24:31 PM
Windows XP Professional Service Pack 3 (build 2600)
PC Land, Inc. Custom-built
2.80 gigahertz Intel Pentium Dual-Core
64 kilobyte primary memory cache
2048 kilobyte secondary memory cache
64-bit ready. Multi-core (2 total) . Not hyper-threaded.
Main Circuit Board
Board: ASUSTeK Computer INC. P5KPL-AM EPU x.0x
Serial Number: MT7009017411947
Bus Clock: 200 megahertz
BIOS: American Megatrends Inc. 0501 08/20/2010
202.76 Gigabytes Usable Hard Drive Capacity
148.52 Gigabytes Hard Drive Free Space
ST3500418AS [Hard drive] (500.11 GB) -- drive 0, SMART Status: Healthy 1
Megabytes Usable Installed Memory
Slot 'DIMM A1' has 1024 MB
Slot 'DIMM B1' is Empty
ATI Radeon HD 5670 [Display adapter]
DELL U2412M [Monitor] (24.0"vis, s/n 827803212, October 2011)
AMD High Definition Audio Device
VIA High Definition Audio
Judging by the length of your post, I realize that you really have looked into the subject, and I think it's still worth to post to your question even after two weeks. In case that you've already found the solution, please let me know that too.
I nearly have the same problem as you, except I have a Realtek sound card in my Gigabyte motherboard, and I've got "Realtek HD Audio output" as Windows's default sound device. I could only see that option at the "Control Panel>Sounds and Audio Devices Properties>Audio" window. I know that this completely won't sound convincing, but while looking through the options in CCC, after I checked it time to time, once the "ATI HD Audio rear output" option "magically" appeared below "Realtek HD Audio output", while the PC was connected to the TV via HDMI. With that, I had been able to change it, and finally the TV's speakers made sound.
I know this isn't much help, just wanted you to know. Have you tried to update your drivers and CCC?