Motherboard connectors pinouts  > Dell pinouts
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)

34 pin IDC male connector layout
34 pin IDC male connector
at the Front Panel Board
16 pin IDC male connector layout
16 pin IDC male connector
at the Front Panel Board
According to 1 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
Dell OptiPlex GX280 Front Panel I/O Assembly Pin-Outs visual pinout:
Dell OptiPlex GX280 Front Panel I/O Assembly Pin-Outs  diagram
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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