LG Electronics KS360 Keypad back-light illumination, Qwerty + MultiKeypad Backlight Circuit

3. TECHNICAL BRIEF

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.

QWERTY_KEY BACKLIGHT

VBAT

		R310
LEWWS44-E	LD300	47
		R311
LEWWS44-E	LD301	47
		R312
LEWWS44-E	LD302	47

QWERTY_KEY_BL

VA301 ICVN0505X150FR

MULTI_KEY BACKLIGHT

VBAT

C101

1u

LD100 R103 100ohm

	100ohm
LEBB-S14E	R104
	LD101

	100ohm
LEBB-S14E	R105
	LD102

	100ohm
LEBB-S14E	R106
	LD103

	100ohm
LEBB-S14E	R107
	LD104

	100ohm
LEBB-S14E	R108
	LD105

	100ohm
LEBB-S14E	R109	LEBB-S14E
	LD106

C102

1u

R110	Q100
SUB_KEY_BL
	2SC5585
1K
R111	10K

Figure 12. Qwerty + Multi_Keypad Backlight Circuit

Copyright © 2008 LG Electronics. Inc. All right reserved.	- 43 -	LGE Internal Use Only
Only for training and service purposes