LG KM710 Service Manual - Page 94
Main Key Backlight LED Trouble Shooting
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4. Trouble Shooting 4.19 Main Key Backlight LED Trouble Shooting z Keypad backlight LED Operation scheme is shown below. VBAT R703 10 R704 10 A A 1 1 LDC700 SSC-SWTS1007 2 C 2 LD701 SSC-SWTS1007 LED_MAINKEY 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 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 95 - LGE Internal Use Only
- 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