Keypad Back Light Trouble - LG KF600d Service Manual

5. Trouble shooting

5.9. Keypad back light trouble

Check Points
-Signal path is connected well
-Analog SW is working properly
KEY_BACKLIGHT
KP_IN(0)
KP_IN(1)
KP_IN(2)
KP_IN(3)
KP_IN(4)
KP_OUT(0)
KP_OUT(1)
KP_OUT(2)
KP_OUT(3)
END_KEY
ICVL0505101V150FR
LGE Internal Use Only
LD101
R102 100ohm
R103 100ohm
LD102
CN303
G1
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
G2
Copyright © 2007 LG Electronics. Inc. All right reserved.
- 86 -
VBAT
LEWWS44-E
LEWWS44-E
VBAT
MAIN_MIC_P
MAIN_MIC_N
2V62_VIO
VMIC_P
VMIC_N
KEY_BACKLIGHT
TP
SLIDE_DETECT
C330
2.2u
VA313
ICVL0505101V150FR
Only for training and service purposes