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Need help getting front panel audio jacks to work


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udm's Avatar
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16-Dec-2008, 05:32 AM #1
Need help getting front panel audio jacks to work
I'm a bit confused here. My mobo is an MSI K9N-Ultra. Currently, the connectors on the motherboard for the front audio panel look like this (see attached document jaud.jpg)

Here's a description of each connector, from 1 to 10.
  1. MIC_L: Microphone - Left Channel
  2. GND: Ground
  3. MIC_R: Microphone - Right channel
  4. PRESENCE# : Active low signal-signals BIOS that a High Definition Audio dongle is connected to the analog header. PRESENCE# = 0 when a High Definition Audio dongle is connected
  5. LINEout_R: Analog Port - Right channel
  6. MIC_JD: Jack detection return from front panel microphone JACK1
  7. Front_JD: Jack detection sense line from the High Defintiion Audio CODEC jack detection resistor network
  8. NC: No control (you can see from the attached diagram that its empty)
  9. LINE out_L: Analog Port - Left channel
  10. LINEout_JD: Jack detection return from front panel JACK2

However, for the wires from my casing, all I have are:
  1. L OUT
  2. R OUT
  3. L OUT
  4. R OUT
  5. MIC IN
  6. MIC POWER
  7. GROUND
7 in total.

Yes it's not a typo - I have 2x L OUTs and R OUTs. I have no idea what wires to attach to which connectors, besides GROUND. I've tried various combinations, but I can't get my audio jacks, especially the microphone one, to work. I really need some help here please!
Attached Thumbnails
Need help getting front panel audio jacks to work-jaud.jpg  
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cwwozniak   (Chuck) cwwozniak is offline cwwozniak is a Trusted Advisor with special permissions. cwwozniak has a Profile Picture
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16-Dec-2008, 12:20 PM #2
Sounds like you may be using a front panel wired for an AC'97 header and your board has an Intel HD Audio configuration header. You can read about both configurations starting at page 19 of 72 in Intel's documentation (link to PDF File)

See if you have a BIOS setting to not use audio jack detection since your front panel jacks most likely do not have the extra contacts as shown in the digram on page 25 of 72 in the above documentation.
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16-Dec-2008, 03:12 PM #3
Ahh thanks, but I'm using an AMD board. Or does the same thing apply here? lol

I took a look at the pdf file there. Yeah maybe my motherboard is using an HD audio connection. Hmm you say I should try to set my BIOS to not use audio jack detection...what do you mean? Sorry I'm a bit lost here
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16-Dec-2008, 04:06 PM #4
Intel wrote the standard. It does not mean it is for Intel CPU based motherboards only.

The HD Audio interface uses microphone and headphone jacks that have a built in switch that closes when a plug is inserted. This tells the audio controller to use the associated audio signal lines for the given jack. Otherwise it does not use them.

There may be a setting in the BIOS configuration screen that forces the audio controller to ignore the jack switch sensing inputs and just activate using the signal lines. Check the motherboard user manual to see if the BIOS has such a setting. If not, you will need figure out how to short pins #6 and #10 to pin #7 on the motherboard header.

EDIT: I am not sure what will happen if you force the audio controller to use the front panel jacks. It may disable the matching rear panel jacks on the motherboard.

Last edited by cwwozniak; 16-Dec-2008 at 04:17 PM..
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16-Dec-2008, 11:57 PM #5
Ah many thanks
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