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20 Pin Front panel USB, Speaker (Optional MIC) Proprietary


2..................20
1..................19
Viewed from the top (connector) side of the motherboard. 
Motherboard Pin
Name
Motherboard Pin
Number
Direction Pin
Number
Pin
Name
Description
Data0- 1 -?-     Data - for USB port 0 (Bottom)
Data0+ 3 -?-     Data + for USB port 0 (Bottom)
Data1- 5 -?-     Data - for USB port 1 (top)
Data1+ 7 -?-     Data + for USB port 1 (top)
GND 9 -?-     Ground
GND 11 -?-     Ground
Left Audio In * 13 -?-     Input for rear Audio (L) *
Right Audio In * 15 -?-     Input for rear Audio (R) *
GND 17 -?-     Ground
MIC IN 19 -?-     Microphone Input (+)
Detect ** 2 -?-     See below **
Vcc 4 -?-     +5V for USB ~Both~
? 8 (may be 6?) -?-     Unknown
Vcc 6 (may be 8?) -?-     +5V for USB ~Both~
Ring * 10 -?-     Speaker Ring & RS Terminal *
Tip * 12 -?-     Speaker Tip & TS Terminal *
Detect ** 14 -?-     See below **
Keyed 16 -?-     No pin
GND 18 -?-     Ground
? 20 -?-     Unknown

   To use this board in a non-dell case w/o front USB & sound:

*  Jump (connect) pins 10-13 (L) and 12-15 (R) for rear sound.

** Jump (connect) pins 2-14 to avoid Front panel USB cable not detected error.

The Dell Dimension 2400 uses the standard 9 pin USB header for the front ports and use a separate connector for the front headphone jack (the same connector used on many dells of that era).

 

According to 6 reports in our database (3 positive and 0 negative) the Dell Dimension 2350, 2400 internal USB & Speaker pinout should be correct.

Is this pinout
Dell Dimension 2350, 2400 internal USB & Speaker visual pinout:click to enlarge
Source(s) of this and additional information: www.ataisolutions.com, http://support.dell.com/support/edocs/systems/dim2350/techov.htm#1101668
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