- 95 -
4. Trouble Shooting
4.19 Main Key Backlight LED Trouble Shooting
z
Keypad backlight LED Operation scheme is shown below.
z
Backlight operation
- Keypad backlight LED is controlled with LED_BC signal
- LED_BC signal from DBB(U103)
- The LEDs are forward biased and turned on
z
Check Point
- VBAT level ( 3.35 ~4.2V)
- LEDs
- Main key, Main, Main FPCB connection
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
10
R704
VBAT
A
1
C
2
SSC-SWTS1007
LD700
R703
10
A
1
C
2
LD701
SSC-SWTS1007
LED_MAINKEY
Содержание KM710
Страница 1: ...Date May 2008 Issue 1 0 Service Manual Model KM710c Service Manual KM710c Internal Use Only ...
Страница 123: ... 124 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 129: ... 130 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 139: ... 140 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 173: ...Note ...
Страница 174: ...Note ...