LG GB220 - Key Backlight Led

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
START
Is Pin3 of Q200 low
at KEY_BL_EN = high ?
NO
Check Q200
Are all LEDs
Working?
NO
YES
Check the soldering
each R and LED
Backlight will work properly.
NO
Replace or resolder
component
CHECKING FLOW
YES
CIRCUIT
Key Backlight LED
D201
DNI_VARISTER_1005
100K
R212
R211
1.2K
R209
20
LD200
1
KTC4075E
EQBN0007601
2
3
Q200
20
R210
LD201
LEWWS47PAZ
EDLH0013403
D200
DNI_VARISTER_1005
VBAT
KEY_BL_EN