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34 pin IDC male connector layout
34 pin IDC male connector
at the Front Panel Board
Similar to other Dell I/O assembly boards, it is a board with USB connectors and a headphone connector. It also has a connection to the Control Panel Board (Power switch and LEDs).

 

Pin
Number		 Pin
Name		 Description
1   No Connection  No Connection
2   VCC - USB  Dual USB Pins #1 / #2
3   VCC - USB  Dual USB Pins #1 / #2 
4   VCC - USB  Dual USB Pins #1 / #2
5   HDD and ESUP LED +  To R19, Then CTRL Panel Pin #6
 To R20, Then CTRL Panel Pin #14
6   No Connection   No Connection
7   No Connection   No Connection
8   No Connection   No Connection
9   Ground   CTRL Panel Pins #3 / #7 / #15 / #16
10   Ground if CTRL Panel is connected   CTRL Panel Pin # 11
11   Ground   Dual USB Pins #7 / #8
12   USB #1 - Data -   Dual USB Pin #3
13   USB #1 - Data +   Dual USB Pin #5
14

  Ground

   Dual USB Pins #7 / #8
15   No Connection   No Connection
16   Ground   Dual USB Pins #7 / #8
17   USB #2 - Data -   Dual USB Pin #4
18   USB #2 - Data +   Dual USB Pin #6
19   Ground   Dual USB Pins #7 / #8
20   Power Switch   CTRL Panel Pin #2
21   Pin Removed - KEY   No Connection
22   HDD LED -   CTRL Panel Pin #4
23   Power LED + (Green / On)   CTRL Panel Pin #5
24   ESUP LED -   CTRL Panel Pin #13
25   Ground   CTRL Panel Pins #3 / #7 / #15 / #16
26   No Connection   No Connection
27   Power LED + (Yellow / Off)   CTRL Panel Pin #9
28   Suspend Switch   CTRL Panel Pin #8
29   Intruder Pin #2   Intruder Pin #2
30   Intruder Pin #1   Intruder Pin #1
31   External Speaker Pin #2   External Speaker Pin #2
32   Intruder Pin #3   Intruder Pin #3
33   External Speaker Pin #4 / #5   External Speaker Pin #4 / #5
34   External Speaker Pin #1   External Speaker Pin #1

 

Note 1. The power LED is a 'bi-colour' type'. The voltage on the control pair is reversed to switch from one colour to the other (so +5v  / 0v is Yellow,  0v / +5v is Green

Note 2. The USB 5v fuses are on the motheboard (replacing the front panel board won't fix a blown fuse)

16 pin IDC male connector layout
16 pin IDC male connector
at the Front Panel Board
Pinout status: +4 -0
According to 4 reports in our database (4 positive and 0 negative) the Dell OptiPlex GX280 Front Panel I/O Assembly Pin-Outs pinout should be correct.

Is this pinout
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Dell OptiPlex GX280 Front Panel I/O Assembly Pin-Outs visual pinout:click to enlarge
Source(s) of this and additional information: http://skeena.net/kb/Dell mainboard front button interface/front_pnl.htm
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