LG KF750 Service Manual page 94

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
V B A T
D C D C
M C I 9 4 0 7 1 Y M T Q 4 0 0
4 1
E N V O U T
3 2
V N I G N D
E L _ D C D C _ E N
C 4 2
2 2 . u
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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
C 1
1 B 1 T O U C
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
V R E G _
F O R E L
L 4 0 0
1 0 u H
U 4 0 0
1 8
O U T P G N D
2 7
V N I S W
3 6
E N F B
5
N C
9
4
2 A N G D T _ G N D
M C I 2 2 9 0 Y M L
The output must be 6.1V DC.
4. TROUBLE SHOOTING
TP14_BB U700
U700
Main Board
TP15_BB U800
_ S C R E E N _ S D A
U800
_ S C R E E N _ S C L
H _ R S T
H _ S C R E E N _ N I T
_ T O U C H _ L D O _ E N
Main Board
6 1 . V
U400
TP16_BB
U400
output
output
C 4 2 1
4 7 . u
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LGE Internal Use Only