Keypad Back-Light Illumination - LG KE600 - Cell Phone Service Manual

3. TECHNICAL BRIEF
Numeric keys, Camera key and volume up & down keys are located on the MAIN PCB, Jog key for
menu navigation, Power on (End key), MP3 hot key and Send key is on the SUB PCB, are connected
via 50pin board to board connector between main PCB and FPCB.

3.9. Keypad back-light illumination

There are 9 snow white color LEDs on the sub PCB for keypad illumination. Keypad Back-light is
controlled by SM-Power LED port which has constant current control function.
The whole configuration of the SM-POWER LED drivers is shown in below Figure14. (SLED1, SLED2
port are not used in the KE600.KE608)
Figure 14 Keypad Back-light LEDs
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