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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. BB Circuit Technical brief
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Z_
Copyright
གྷ
2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
snlGpG|Gv G
3.9 keypad back-light illumination
3.9.1 Number keypad back-light illumination
There are 2 snow white color LEDs on Key for keypad illumination. Keypad Back-light is controlled by
SM-Power3 Flash LED port which has constant current control function. The whole configuration of
the SM-POWER3 Flash LED drivers is shown in below Figure.
[Figure 3.10.1-1] LED driver in the SM-POWER3
[Figure 3.10.1-2] Number key back-light LED circuit diagram
VBAT
LEGG-S14G
LD1
TWH104-HS
LD2
SSC-FR104-II1
LD3
2.7
R21
R22
56
150
R23
KEY_BACKLIGHT
KEY BACKLIGHT
rt\\\GGG
[X
Copyright
གྷ
2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
snlGpG|Gv G
3.9 keypad back-light illumination
3.9.1 Number keypad back-light illumination
There are 2 snow white color LEDs on Key for keypad illumination. Keypad Back-light is controlled by SM-
Power3 Flash LED port which has constant current control function. The whole configuration of the SM-
POWER3 Flash LED drivers is shown in below Figure.
[Figure 3.10.1-1] LED driver in the SM-POWER3
[Figure 3.10.1-2] Number key back-light LED circuit diagram
rt\\\GGG
[X
Copyright
གྷ
2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
snlGpG|Gv G
3.9 keypad back-light illumination
3.9.1 Number keypad back-light illumination
There are 2 snow white color LEDs on Key for keypad illumination. Keypad Back-light is controlled by SM-
Power3 Flash LED port which has constant current control function. The whole configuration of the SM-
POWER3 Flash LED drivers is shown in below Figure.
[Figure 3.10.1-1] LED driver in the SM-POWER3
[Figure 3.10.1-2] Number key back-light LED circuit diagram
rt\\\lGGG
Z_
Copyright
གྷ
2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
snlGpG|Gv G
3.9 keypad back-light illumination
3.9.1 Number keypad back-light illumination
There are 2 snow white color LEDs on Key for keypad illumination. Keypad Back-light is controlled by
SM-Power3 Flash LED port which has constant current control function. The whole configuration of
the SM-POWER3 Flash LED drivers is shown in below Figure.
[Figure 3.10.1-1] LED driver in the SM-POWER3
[Figure 3.10.1-2] Number key back-light LED circuit diagram
Содержание KM555
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