LG KF750 Service Manual page 91

4. TROUBLE SHOOTING
V R E G _ 6 1 . V V B A T
A C C _ G P 1 2 _ T O U C H _ L D O _ E N
C
1
T O U C H S C R E E N L e v l e S h t f i r e
T P 8 0 4
A 1
A P P _ G P 0 4 _ T O U C H _ S C R E E N _ N I T A
T P 8 0 6 A 2
A P P _ G P 0 5 _ T O U C H _ R E S E T A
T P 8 0 7
A 3
A P P _ G P 0 5 _ T O U C H _ S C R E E N _ S C L A
T P 8 1 3
A P P _ G P 1 6 _ T O U C H _ S C R E E N _ S D A
0
R 8 0 5
LGE Internal Use Only
T O U C H _ L D O
T O U C H _ 3 1 . V
U 7 0 0 R 1 1 1 4 D 3 1 1 D
1 3
V D D V O U T
4 2
N C G N D 1
6 5
C E G N D 2
7 1 6 C 7 1 7
u 1 u
The output must be 3.1V DC.
N I _ T O U C H
N I _ T O U C H
T O U C H
C 1
1 B 1 T O U C H
U 8 0 0
B 4
2 T X S 0 1 0 4 E Z X U R G N D
B 3
3 O E A C C _ G P 1 2
V D D E _ 1 V 8
The output must be 3.1V DATA or Clock signal
Multikey
R906
TP12_BB
TP12_BB
R907
TP10_BB
U700
U700
Main Board
TP11_BB
U800
U800
_ S C R E E N _ S D A
_ S C R E E N _ S C L
_ R S T
_ S C R E E N _ N I T
_ T O U C H _ L D O _ E N
TOUCH_CONNECTOR
R906
CN901
17 18
1 14
2 13
R907
3 12
4 11
5 10
6 9
7 8
15 16
Change Multikey PCB
Copyright © 2008 LG Electronics. Inc. All right reserved.
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TOUCH_3.1V
TOUCH_SCREEN_INT
TOUCH_SCREEN_SCL
TOUCH_SCREEN_SDA
Only for training and service purposes