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User profile for user: lebom
lebom Author
User level: Level 1
0 points

Pin assignment (front panel to mainboard connection)

Hi, does anyone know the correct pin assignment of the front panel? Got a g5 in pieces and I want to reassemble it. I know there is a cable for replacement but I don't wanna buy it - using spare parts instead.
Help much appreciated

mac g5, Windows XP Pro, intel core 2 duo E6600

Posted on Nov 8, 2006 9:09 AM

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User profile for user: maclover
maclover
User level: Level 4
3,850 points

Posted on Nov 8, 2006 9:27 AM

Hi lebom, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!

This may help...

Front Panel Board Connector
Pin# Signal Type
1 25V
2 V-GND
3 FW TPA Twisted Pair Shield 110 Ohm
4 FW TPA + Twisted Pair Shield 110 Ohm
5 CHASSIS GND FW
6 CHASSIS GND USB
7 FW TPB Twisted Pair Shield 100 Ohm
8 FW TPB+ Twisted Pair Shield 100 Ohm
9 USB PWR
10 USB GND
11 USB Twisted Pair Shield 60 Ohm
12 USB+ Twisted Pair Shield 60 Ohm
13 LED
14 PWR BTN
15 AUDIO SENSE
16 AUDIO COM Twisted TRI
17 AUDIO RIGHT Twisted TRI
18 AUDIO LEFT Twisted TRI
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User profile for user: maclover
maclover
User level: Level 4
3,850 points

Nov 8, 2006 9:27 AM in response to lebom

Hi lebom, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!

This may help...

Front Panel Board Connector
Pin# Signal Type
1 25V
2 V-GND
3 FW TPA Twisted Pair Shield 110 Ohm
4 FW TPA + Twisted Pair Shield 110 Ohm
5 CHASSIS GND FW
6 CHASSIS GND USB
7 FW TPB Twisted Pair Shield 100 Ohm
8 FW TPB+ Twisted Pair Shield 100 Ohm
9 USB PWR
10 USB GND
11 USB Twisted Pair Shield 60 Ohm
12 USB+ Twisted Pair Shield 60 Ohm
13 LED
14 PWR BTN
15 AUDIO SENSE
16 AUDIO COM Twisted TRI
17 AUDIO RIGHT Twisted TRI
18 AUDIO LEFT Twisted TRI
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User profile for user: lebom
lebom Author
User level: Level 1
0 points

Dec 18, 2006 8:33 AM in response to lebom

Well for some reason I miss my multimeter and therefore cannot check pin voltages / currents. so what I need to know is where do you start to count the pins (usually it starts in the bottom left corner with pin 1 and goes next right, row up, next right and so on...). Is it necessary to have a 25 V connected just to check proper function of power led and button? A photo might be helpful to identify the correct pin assignment (don't want to shorten anything)

Thanks
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Pin assignment (front panel to mainboard connection)

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