3.11 Keypad back-light illumination
There are 3 snow white color LEDs on Main PCB and 7 blue color LEDs on Sub PCB for keypad
illumination. Sub Keypad Back-light is controlled by S-GOLDradio PWM port which has a duty control
function. And Main Keypad Back-light is controlled by S-GOLDradio FLASH_SINK port. The whole
configuration of the S-GOLDradio Flash LED circuit is shown in below Figure12.
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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 12. Qwerty + Multi_Keypad Backlight Circuit
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