Dell PC FRONT PANEL PINOUTS

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Dell GX270N Front Panel Pinout

Located halfway up under the front bezel section with the ventilation holes.


Parts side:

Dell front pnl overlay.jpg


Solder side:

Dell front pnl back.jpg


Connector List:

  • FNT_PNL <#FNT_PNL>: Front Panel (connects to motherboard). 34-pin, two-row, tight-spaced, Pin 21 is missing.
  • AUDIO_CABLE <#AUDIO_CABLE>: Connects to motherboard. Single-row, 10-pin, tightly-spaced; Pin 7 is missing.
  • EXT_SPK <#EXT_SPK>: Optionally connects to external speaker.
  • HP_OUT <#HP_OUT>: Headphone out. Stereo 3.5mm jack.
  • USB_FNT <#USB_FNT>: Front USB connectors. Double USB connector.
  • CTRL_PNL <#CTRL_PNL>: Control Panel connector, 16-pin, two-row, jumper-spaced, Pin 1 is missing, blocked on the connector.
  • INTRUDER <#INTRUDER>: Connects to the chassis intrusion detector switch. Single-row, 5-pin, jumper-spaced. 5-pin version of the 4-pin CD-AUDIO connectors.


FNT_PNL

34 pin cable connects motherboard to front panel


Fnt pnl.gif


From the pin-side:

PIN ---- DESCRIPTION --> CONNECTS TO

1 INTRUDER 3 --> INTRUDER 3, FNT 32

2 5v Power --> FNT 3, FNT 4

3 5v Power --> FNT 2, FNT 4

4 5v Power --> FNT 2, FNT 3

5 LED VCC --> CTRL 6 thru R19,CTRL14 thru R20

6 GND LED ESUP

7 LED PSON

8 INTRUDER 5 --> INTRUDER 5

9 GND --> GND

10 GND? --> GND?

11 GND --> GND

12 USB 1 (bottom) Data - (white)

13 USB 1 (bottom) Data + (green)

14 GND --> GND

15 USB 5V+ (both ports)

16 GND --> GND

17 USB 2 (top) Data - (white)

18 USB 2 (top) Data + (green)

19 GND --> GND

20 PWR SWITCH LEFT SIDE (Both) --> CTRL 2

21 Pin removed —

22 HDD LED NEG --> CTRL 4

23 PWR LED GREEN POS --> CTRL 5

24 ESUP LED NEG --> CTRL 13

25 GND --> GND

26 ?

27 PWR LED YELLOW POS --> CTRL 9

28 ESUP SWITCH RIGHT SIDE (Both) --> CTRL 8

29 GND --> GND

30 INTRUDER 1 --> INTRUDER 1

31 EXT_SPK 2 --> EXT_SPK 2

32 INTRUDER 3 --> INTRUDER 3

33 EXT_SPK 4 --> EXT_SPK 4

34 EXT_SPK 1 --> EXT_SPK 1

* Special Notes for Immortal Kombat Arcade Classics

The 34 pin cable was hacked to provide USB ports, power on/off switch and HD activity lights for the Games Cabinet.

5 volt power from pins 2,3,4 is used to supplement 5v power supplied from pin 15 to the USB ports (ie, they are all connected).

External speaker pins were NOT connected.


AUDIO_CABLE


Audio cable.gif


From pin-side:

PIN ---- DESCRIPTION --> CONNECTS TO

1 GND --> GND

2 OUT LEFT --> 3.5 jack tip

3 GND --> GND

4 OUT RIGHT --> 3.5 middle ring

5 GND --> GND

6 ?

7 Pin removed ?

9 ?

10 GND --> GND

* Special Notes for Immortal Kombat Arcade Classics

This cable was hacked, so that audio could be supplied more conveniently from 3.5mm audio plug at rear of the PC, passing through the cabinet's volume control.


EXT_SPK


Ext spk.gif


From pin-side:

PIN ---- DESCRIPTION --> CONNECTS TO

1 --> FNT 34

2 --> FNT 31

3 GND GND

4 --> FNT 33

* Special Notes for Immortal Kombat Arcade Classics

External speaker connector has been used to supply stereo audio output to internal cabinet amplifier and speakers.


HP_OUT

3.5mm headphone socket


When unconnected:


Hp out.gif


When connected to a 3.5mm headphone jack:


Hp out conn.gif


From solder-side:

PIN ---- DESCRIPTION --> CONNECTS TO

1 SENSE --> GND if connected, otherwise Base Ring (floats)

2 GND --> GND

3 SENSE --> GND if unconnected, otherwise floats

4 SENSE --> GND if connected, otherwise Base Ring (floats)

5 GND --> GND

6 SENSE --> GND if unconnected, otherwise floats

7 Left channel --> Tip

8 GND if connected, otherwise floats --> Base Ring

9 Right channel --> Middle Ring

* Special Notes for Immortal Kombat Arcade Classics

Stereo audio signals are hacked, and passed through from the headphone jack (HP_OUT) to the external speakers connector (EXT_SPK). This allows audio output to cabinet speakers until a headphone jack is inserted, at which point they will go quiet.


CTRL_PNL


Ctrl pnl.gif


From the pin-side:

PIN ---- DESCRIPTION --> CONNECTS TO FNT_PNL Pin #

1 Removed and blocked on the connector

2 PWR SWITCH LEFT SIDE (Both) --> 20

3 GND --> GND

4 HDD LED NEG --> 22

5 PWR LED GREEN POS --> 23

6 HDD LED POS --> 5 thru R19

7 GND --> GND

8 ESUP SWITCH RIGHT SIDE (Both) --> 28

9 PWR LED YELLOW POS --> 27

10 N/C

11 GND --> GND

12 N/C

13 ESUP LED NEG --> 24

14 ESUP LED POS --> 5 Thru R20

15 GND --> GND

16 GND --> GND


INTRUDER


Intrusion.gif


From pin-side:

PIN ---- DESCRIPTION --> CONNECTS TO

1 ?? --> FNT 30

2 GND --> GND

3 FNT 1, FNT 30

4 GND --> GND

5 FNT 8

==========================================

Special Thanks to Peter Lada for partially solving this puzzle for me (400sc-at-peterlada-dot-com).

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