Taylor,
The following is my way of wiring up a G5 Power Mac front panel. I cut an Apple front panel cable in half and splice in my own wires using sloder and shrink tubing as seen below.
The key is locating the correct pins in the cable connector:
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First the AUDIO portion.
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I find a existing HD-AUDIO cable, usually to be found on old cases, and wire it up as shown here. The switch is a manual way of changing from the front to back (green) ports. Note, many of these cables have two 10 pin connectors at the motherboard end of the cable; cut the other connector off and retain only the HD-AUDIO on the cable.
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Power Switch and LED.
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Shown here, the power switch and LED are on the small green PCB. Of interest the center terminal on the PCB and on the three pin connector is the common or ground return for both power swithch and the LED.
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Here I have added the Power LED lead to pin 14 on the Apple 18 pin connector.
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And then pin 13 is connected to my two wire POWER SW harness - the Green wire.
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Then the White wire is connected to pin 2 of the Apple 18 pin connector.
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USB section.
Locate a single USB cable. You need the end that will connect to your motherboard USB header, usual a black 5 position connector with 4 wires (Red, White, Green, and Black).
Cut this cable to a convenient length to reach a USB header on the motherboard. Strip off about 3 inches of the outer cable jacket. The shielding is exposed; pick and otherwise worry the shielding until you can free the four wires. Cut away the foil portion and twist the thin wires into a tight lead. Now strip each of the four wire about 1/4 to 5/16 inch. Add some small shrink tubing to each lead.
As shown, I use blue tape when an extra set of hands is need to hold the wires for soldering. Here I am soldering the wires from the Apple connector, pin 6 and pin 10 to the Black wire and the shield wire on the USB cable.
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Then solder the lead from the Apple connector pin 9 to the red wire on the USB cable.
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Here I have already soldered the Apple connector pin 11 to the Green wire in the USB cable and wire from the Apple connector pin12 to the USB cable White wire.
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And I reassembled the desk sample Apple front panel assembly and tested it on my current project board... It works.
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I may take some heat from others as I do not have a better solution for the audio at this time.
Good modding,
neil