sound

  • Thread starter Thread starter CDR
  • Start date Start date
CDR said:
K8N motherboard was replaced with a K8N Neo4,
now there is no sound. Any suggestions?
CDR
Click to expand...

Go to Add/Remove and uninstall the old driver.

Then, take the motherboard CD out of the
box the K8N Neo4 came in, and install the
sound driver on that CD.

Examine Device Manager before and after, and
note any changes.

Paul
 
I had already checked out the drivers. The problem turned out
to 2 missing jumpers on the audio jumper strip which according
to the manual directs the audio to the front panel instead of the rear??
CDR
 
CDR said:
I had already checked out the drivers. The problem turned out
to 2 missing jumpers on the audio jumper strip which according
to the manual directs the audio to the front panel instead of the rear??
CDR
Click to expand...

Yes, as shipped from the factory, motherboards with AC'97 audio
front panel headers, have two jumpers. The jumpers must be in
place for front_left and front_right, for the signal to be forwarded
to the lime green colored audio connector on the motherboard back panel.

When you have front panel headphone and microphone jacks,
you remove the two jumpers, and connect the 2x5 cable assembly
from the front panel. There are two "side-contacts" in the headphone
jack, which function the same way as the jumpers. When no headphones
are present in the front headphone jack, the side-contacts are
closed, and that forwards the signal to the rear connector.

When you plug headphones into the front panel headphone jack, the
side-contacts open, and the signal to the back panel lime green
connector is interrupted. That functions as a "speaker mute" when
the headphones are plugged in.

When you buy a used motherboard, the previous owner may unplug their
2x5 cable assembly, and then forget to put the jumpers back in place.
This causes sound to malfunction, when everything in Device Manager
looks good.

AC'97 motherboards are different than HDAudio motherboards, in that
the HDAudio ones don't have or need the jumpers. Only the AC'97 ones
have that "feature". In the case of HDAudio motherboards, there
are so many channels available on the chip, that tricky side contacts
are no longer needed. The desired muting effect is done in software,
by turning off the rear signal and turning on the headphone signal.
The HDaudio chip is so full-featured, you can even swap the headphone
and microphone in the front two jacks, and they still work as expected.
Jacks are "re-taskable" in HDAudio, so a jack can be an input for a
microphone, or an output for a speaker or headphones. HDAudio is
much more flexible.

Paul
 
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