PHONE WORKSHOP all about mobile phone repairing
 
Pin     Signal     Description
1     USB +5V in     USB 5V supply - in K750 not used
2     SP_REF     Reference / headphone gnd
3     Mic+/AUXIN_L     Microphone+ / AUX Input - left / Short to 4 for Answer button (*)
4     Mic-/AUXIN_R     Microphone- / AUX Input - right / Short to 3 for Answer button (*)
5     DFMS/SP_L     DFMS / headphone speaker - left
6     DTMS/SP_R     DTMS / headphone speaker - right
7     VIDEO/STB     Video / strobe
8     VPPFLASH     Short to pin 9 for handsfree detection (use a 130 ohm r)
9     GND     Ground
10     CTMS / USB DATA+     CTMS / USB+ (data) - in K750 not used
11     CFMS / USB DATA-     CFMS / USB- (data) - in K750 not used
12     Charge In     Battery charging (+5V) - in K750 not used

Used Shortcuts:

* CTMS stands for Control To Mobile Station
* CFMS stands for Control From Mobile Station
* DTMS stands for Data To Mobile Station
* DFMS stands for Data From Mobile Station