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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
QWERTY_KEY BACKLIGHT
R311
47
47
R312
47
R310
VBAT
LD300
LEWWS44-E
LEWWS44-E
LD302
LEWWS44-E
LD301
VA301
ICVN0505X150FR
QWERTY_KEY_BL
MULTI_KEY BACKLIGHT
100ohmR107
VBAT
R111
10K
1u
C101
2SC5585
Q100
1K
R110
LEBB-S14E
LD100
LEBB-S14E
LD101
LEBB-S14E
LD104
LEBB-S14E
LD105
R104 100ohm
LD102
LEBB-S14E
100ohmR105
LD103
LEBB-S14E
R106 100ohm
100ohmR103
LD106
LEBB-S14E
C102
1u
100ohmR109
R108 100ohm
SUB_KEY_BL