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5. Trouble shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5.10 Keypad back light trouble
Check Points
-Signal path is connected well
-TR is working properly
QWERTY_KEY BACKLIGHT
R311
47
47
R312
47
R310
VBAT
LD300
LEWWS44-E
LEWWS44-E
LD302
LEWWS44-E
LD301
VA301
ICVN0505X150FR
QWERTY_KEY_BL
MULTI_KEY BACKLIGHT
100ohmR107
VBAT
R111
10K
1u
C101
2SC5585
Q100
1K
R110
LEBB-S14E
LD100
LEBB-S14E
LD101
LEBB-S14E
LD104
LEBB-S14E
LD105
R104 100ohm
LD102
LEBB-S14E
100ohmR105
LD103
LEBB-S14E
R106 100ohm
100ohmR103
LD106
LEBB-S14E
C102
1u
100ohmR109
R108 100ohm
SUB_KEY_BL
TP1
TP2
TP1
TP2