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On-board sound chip gone bad. Is this possible?
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Vitter
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5. April 2006 @ 22:53 _ Link to this message    Send private message to this user   
I am using one of my PCs as Home Theater PC. It's an Asus A7V8X-X mobo with an on-board sound chip Analog Device's AD1980. It's got SPDIF out as well. I am feeding that output via coax cable to my Denon AV-Receiver.

All was working fine, I could playback Dolby Digital or DTS on my puter and the sound signal was being detected by my AV-Receiver correctly.

Last month I lost all sorts of surround sound out of my computer. That is, the AV-Receiver was detecting neither Dolby Digital nor DTS. The coax out was half-working, meaning, the sound signal was transmitted, but just as PCM and that without surrounds, even though I was playing Dolby Digital or DTS.

I ran SoundMAX's loop test only to find out that no test music was being played on my surround speakers.

I formatted the hard drive and made a clean XP installation + the sound drivers that came with the mobo. Then I immediately ran the test. Still no surround test tone out! So it can't be sound drivers that've gone bad or been replaced.

I checked the coax input of my AV-Receiver using the coax out of my DVD player, it worked fine. So it can't be the AV-Receiver, either.

The only remaining option is that the chip itself went bad!! This is so unusual for me. I've plugging this and that card into various computers and I haven't come across one bad chip yet. That's why I find it so hard to believe.

What's your take with on-board sound chips? Have you ever heard of one that went bad? Is is possible at all? Please help me understand what's going on.
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dblbogey7
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6. April 2006 @ 09:11 _ Link to this message    Send private message to this user   
My ASUS motherboard's sound chip (also an Analog Device) didn't do a very good job with SPDIF passthru - no signal at all from the getgo. Good thing I had an old CL SB Audigy2 that was laying around. Now DD and DTS get through to my Marantz without a glitch.

It could very well be your on-board chip that's giving you the problem. You've done pretty much everything to troubleshoot. Do you have an unused PCI slot for a soundcard?
Vitter
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6. April 2006 @ 10:44 _ Link to this message    Send private message to this user   
Hi dblbogey7,

Thank you for your reply. Yes, I have several empty PCI slots. It looks like I need to shop for a new sound card. What would be my cheapest but most guaranteed solution? I mean, which brand amd model? It can even be an external box that connects over USB 2.0.
dblbogey7
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6. April 2006 @ 11:24 _ Link to this message    Send private message to this user   
If all you want is SPDIF pass-thru you don't really need a very expensive card. I have an old Soundblaster Audigy2 which works just fine. I've read good things about this insanely cheap Chaintech:

http://www.newegg.com/Product/Product.asp?Item=N82E16829120103

More expensive but with really good reviews are the M-Audio cards:

http://www.newegg.com/Product/Product.asp?Item=N82E16829121122

Good luck.
Vitter
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7. April 2006 @ 10:00 _ Link to this message    Send private message to this user   
Thank you very much!
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Vitter
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12. April 2006 @ 23:26 _ Link to this message    Send private message to this user   
Feedback: Yup, it turns out the on-board sound circuitry really went bad. I bought a new soundcard (PSC724) with SPDIF pass-thru and now both AC3 and DTS streams get detected correctly.
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