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A8N SLI Deluxe - no audio output anymore on any connector.
I tried plugging in an old set of speakers with a dodgy AC adaptor,
and now the PC won't output any audio... when I try to get it to sense the connectors, it says failed for all of them. What could be the problem here?? Thanks for any help |
#2
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In article , N-Bomb
wrote: I tried plugging in an old set of speakers with a dodgy AC adaptor, and now the PC won't output any audio... when I try to get it to sense the connectors, it says failed for all of them. What could be the problem here?? Thanks for any help What exactly is a "dodgy AC adapter" ? Are you getting a shock from the product, implying AC is leaking through to the input side ? Ideally, amplified computer speakers should have isolated power. Something like a two prong plug, as that implies the computer will be establishing the ground level. All the AC'97 sound reference designs I've looked at, use AC coupling of the inputs and outputs. The "strong drive" ports, like anything intended for driving headphones, might use 100 microfarad (uf) capacitors for that coupling, while input channels or weak (600 ohm) outputs use 1 microfarad caps (likely ceramic). If a high DC voltage is applied to a large capacitor like that, it could be the inrush current could fry the AC'97 chip. If a high AC voltage is applied, you could exceed the breakdown voltage of the chip pins. It could be, that somehow your speaker setup has driven current backwards into the jacks on the motherboard. If there was DC voltage greater than the breakdown voltage on the caps for example. Looking at the ALC850 datasheet, it is unclear how their jack sense works. The registers in the chip consist of: MX66 Sense Function (can be set to sense tip or ring contact of 6 stereo jacks) 0h: FRONT-OUT (pin-35/36) 1h: SURR-OUT (pin-39/41) 2h: CEN/LFE-Out (pin-43/44). 5h: MIC1 In (pin-21) 6h: MIC2 In (pin-22) 7h: LINE In (pin-23/24) MX68 Sense Function Information (indicates sense cycle worked or not) Information Valid bit, IV 0:After a sense cycle is completed indicates that no information is provided on the sensing method 1:After a sense cycle is completed indicates that information is provided on the sensing method MX6A Sense Detail (sense cycle identifies device plugged into jack) S[4:0] For output jacks: 02h: Not specified or unknown 05h: Powered speaker 06h: Earphone or passive speaker For input jacks: 12h: Not specified or unknown 13h: Mono Microphone 15h: Stereo Line-In so it sounds like the chip is no longer returning "information valid". Either return the motherboard under warranty, and get it fixed, or simply plug in a separate sound card and use that. I doubt the problem is software related, but if you want, using Add/Remove, uninstall the software, then reinstall the software package. If it still isn't working, it is likely some fried hardware. To know more, you would need to see what voltage shows up on the 1/8" stereo plugs on your "dodgy" speakers, with respect to the ground level of your computer case. Using a voltmeter, measure from computer chassis to the tip and ring contacts of the speakers. Try the voltmeter on the high AC range, and then switch to high DC range, and measure again. (You want to use a high range, so the voltmeter isn't damaged.) You might get some idea of what is leaking out of the speakers plugs, waiting to kill whatever it is plugged into. Paul |
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