Thread: Dell Optiplex GX270 Front-Panel Pinout

I'm not sure if this belongs here but I'm using this computer without the case so I had to find out where the power switch was located on the mobo. After a bit of searching, I found a site with some of the pinouts listed.

http://www.motherboardpoint.com/show...60&postcount=9

I just finished figuring out how to do this, and I rang out a bunch more of the wiring than was previously posted.

here's a diagram of the connector on the motherboard:

33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1
o o o o o o x o o o o o o o o o o
o o o o o o o o o o o o o o o o o
34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2

The 34-pin ribbon cable runs to a small sub-board for the front panel, which includes a 16-pin(2x8) header which gets another ribbon cable that goes to the "sub-sub-baord" for the actual poanel light and switches.

The table below shows the functions of the pins on the 34-pin connector, plus where they connect to on the 16-pin "sub-board" header.

34-Pin function 16-Pin
1 GND 3, 7, 15, 16
2 ?
3 ?
4 ?
5 ?
6 ?
7 ?
8 ?
9 GND
10 ? 11
11 GND
12 ?
13 ?
14 GND
15 ?
16 GND
17 ?
18 ?
19 GND
20 Pwr Switch 2
21 “KEY”
22 HD LED 4
23 PWR LED - 5
24 ? 13
25 GND
26 ?
27 PWR LED + 9
28 ? 8
29 GND
30 GND
31 ?
32 GND
33 ?
34 ?

I hope this saves somebody an houtr or 2.

Andy