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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
4.13 KEY backlight Trouble
CIRCUIT
TEST POINT
Check Points
-Control IC is working properly
-Passive Parts soldering Status
WAVE FROM
KEY_BACKLIGHT
OFF
KEY_BACKLIGHT
ON
TP1
R229
R231
Q200
LEWW
-S14
LD203
LD202
LEWW
-S14
2SC5585
2
3
1
Q200
R231
100K
100ohm
R218
LEWW
-S14
LD204
R219
100ohm
LEWW
-S14
VBAT
LD207
100ohm
R222
1u
100ohm
R217
C219
100ohm
R215
C218
1u
LEWW
-S14
100ohm
R220
LD20
9
R223
100ohm
R216
100ohm
100ohm
R224
LEWW
-S14
LD206
100ohm
R221
LEWW
-S14
LD205
10K
R229
LD208
LEWW
-S14
LD200
LEWW
-S14
LD201
LEWW
-S14
KEY_BACKLIGHT
TP1