Need help with PC wiring

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blokewhoknowsnothingabouttech

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Feb 19, 2016
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Hello I'm building a PC and I'm a bit stuck with audio wires. You see, I'm using an old case and PSU and cannot find any '97 audio wires or HD audio wires. What I do have is some wires grouped together and mysteriously marked "MIC" "R" "G" and "L". What are those for and where do they go?

UPDATE: I have wired it up using the diagram that was put in the post below this one and it has worked. Cheers! :D
 
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The G is a shared ground connection; R & L are the right and left output channels respectively and MIC is the mono microphone input.

You'll need to look at the pinout for the AC97 header on the motherboard here and set your BIOS for AC97 (legacy) front panel audio output rather than HD Audio/Azalia mode. Hopefully, you should be able to get the front panel audio connections to work if you connect G to one of the AUD_GND pins, R & L to...
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molletts

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The G is a shared ground connection; R & L are the right and left output channels respectively and MIC is the mono microphone input.

You'll need to look at the pinout for the AC97 header on the motherboard here and set your BIOS for AC97 (legacy) front panel audio output rather than HD Audio/Azalia mode. Hopefully, you should be able to get the front panel audio connections to work if you connect G to one of the AUD_GND pins, R & L to FP_OUT_R & FP_OUT_L and MIC to the MIC pin. You will probably find that the board thinks the headphones are permanently plugged in because there are no FP_RETURN signals, which are used to detect the insertion of the headphone jack.

[Edit] It just occurred to me that the case must be REALLY old to not have AC97 front panel audio. If the PSU is that old then it probably poses a risk to your new components and should be replaced.
 
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blokewhoknowsnothingabouttech

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It IS 400W and my components don't require much power. Or do you just think it's so old it'll fry itself as soon as I turn the thing on?

There are also some cables grouped together marked "VVC" "PORI+" PORI-" and "G". What are those for?

 
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molletts

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It's the "age thing". Some of the components that are used in PSUs don't last forever (the electrolytic capacitors - those cylindrical "can" things - contain a wet electrolyte which dries out over time). It may not fry itself immediately but it could go bang later and possibly take some of your new components with it or it could simply provide out-of-spec voltages or dirty power which may, sooner or later, damage the rest of the system.

If it's a good quality one from a reputable manufacturer and hasn't been heavily used, it may be worth the risk but a cheap-and-nasty one (even brand new!) isn't worth it. Have a look at the PSU Tier List to get an idea of current good/bad PSUs. I wouldn't recommend anything below Tier 3.
 
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molletts

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Sorry - just spotted this bit. I'm not sure about those. Assuming it's "VCC" rather than "VVC", it sounds a bit like a front panel USB port or something similar. I can't think what "PORI+/-" might stand for; on a USB header, the data lines are usually labelled something like "D+/-" or "DATA+/-". "G" would be the ground connection and "VCC" would be the 5V supply.
 
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