"Karl M. North" <OPM@email said:
Hello All,
I have an Asus P4SD-LA which came out of an HP system. It's been a great
board except for the audio. The board has this proprietary HP connector with
a cable that goes to the front of the case for headphone out and mic in.
Well I don't have that connector.
Asus says that I just need to jumper the pins to pass the audio through
it. But they "do not have" the pin out for it. Without it jumpered the front
channels of the audio do not work. I don't want to have to put an
aftermarket audio card into it. I just want to get it to work as it's
supposed to. Do any of you know the pin out etc?
Help,
Karl M North
Of the manuals I've looked at for Asus boards, they seem to have two
different pinouts for front panel audio -
One is the AAPANEL which is compatible with the i-Panel and the other
is the "Intel Compatible" FPAUDIO pinout documented at formfactors.org.
In both cases, they can use two jumpers to maintain continuity of
Line_out all the way to the lime colored connector on the back of the
computer.
FPAUDIO on A7N8X
BLINE_OUT_L x x Line_out_L x<--->x Place jumpers here
x No_connect x
BLINE_OUT_R x x Line_out_R x<--->x and here.
+5VA x x MICPWR x x
AGND x x MIC2 x x
AAPANEL on CUSL2
Line_out_R x x Line_In_R x<--->x Place jumpers here
AGND3 x x AGND2 x x
Line_out_L x x Line_In_L x<--->x and here.
x AGND x
MICPWR x x MIC2 x x
Asus could have more pinouts than this. These are just the ones I've noticed.
There is even a motherboard where a separate jumper block is provided
for the installation of the jumpers I've shown above.
To figure out what is going on, you could get an uncabled 1/8" stereo plug
and plug it into the lime connector on the back of the computer. Then take
an ohmmeter, and probe from tip and ring on the stereo plug to the pins
on the 2x5 connector, and see which pins are shorted (0 ohms) to the tip
and ring signals. Most likely, a jumper should be placed between the pin
you find, to its neighbour across from it.
The circuit should look something like this:
A B
-------------- | |
Sound Chip |------ Line_out-----| |-------x x-----------Lime_Connector
| | |
The jumper you install bridges the connection from the DC blocking
capacitor to the lime Line_out connector. I am suggesting you use
an ohmmeter between points A and B in the figure above, to figure out
which pins on the 2x5 are connected to the lime colored Line_out
connector.
Are you sure the HP site doesn't have this information ? Sometimes there is
a webpage with connector pinouts for the board. You will have to search
using the HP computer model number, because the motherboard model number
may not be used in the documentation.
HTH,
Paul
