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4. Trouble Shooting
4.20 Slide LCD Backlight LED Trouble Shooting
z
Slide LCD backlight LED Operation scheme is shown below.
z
Slide LCD Backlight operation
- Slide backlight LED is controlled with LED_CA1~3 and SLED_CA1~2 signals
- Main Flexible FPCB
- LCD_BL_ENM and LCD_BL_ENS signals from DBB(U102)
- The LEDs are forward biased and turned on
z
Check Point
- VBAT level ( 3.35 ~4.2V)
- Main FPCB
- LEDs
- Charge pump
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VA708
EVLC5S02100
EVLC5S02100
VA709
C710
2.2u
C709
1u
1u
C708
OUT
7
15
P_GND
2
C1N
C1P
6
4
C2N
C2P
5
ENM
9
ENS
8
GND
1
IN
3
LED1
14
LED2
13
LED3
12
LED4
11
LED5
10
U700
MAX863T
VBAT
C707
1u
LCD_BL_ENS
LCD_BL_ENM
SLED_CA2
LED_OUT
LED_CA1
LED_CA3
SLED_CA1
LED_CA2
Summary of Contents for KM710
Page 1: ...Date May 2008 Issue 1 0 Service Manual Model KM710c Service Manual KM710c Internal Use Only ...
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