Table of Contents
Advertisement
CIRCUIT
LD202
CHECKING FLOW
START
Is TP1 low
at KEY_BL_EN = high ?
YES
Are all LEDs
Working?
YES
Backlight will
work properly.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
KEY BACKLIGHT
VBAT
LD202
LD202
VA204
TP1
3
TP1
2
Q201
1
NO
Check Q201
NO
Check the soldering
each R and LED
NO
Replace or resolder
component
4. TROUBLE SHOOTING
LD201
LD201
LD201
VA205
R222
1.2K
KEY_BL_EN
C249
R268
VA226
0.1u
10K
- 101 -
4. TROUBLE SHOOTING
LGE Internal Use Only
Advertisement
Table of Contents
