LG KS660 - Touch Trouble

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
4.8. Touch trouble
Check Points
- Touch driver IC soldering`
- FPCB_Folder Crack
START
Pin1 of CN704 is
high?
FPCB is Crack?
Resolder CN704
Check and Replace
U704
Yes
No
No
PinA2 of Touch driver
IC(U704) is high(2.62v)?
Yes
No
Check 2.62V
Yes
Replace Touch Window
6
1
7
C
I
N
D
R720
4.7K
C712 10u
I
N
D
4
1
7
C
I
N
D
5
1
7C
0.1uFC713
+
X
3
A
-
X
3
C
+
Y
3
B
-
Y
3
D
R
G
Z
Y
I
7
0
0
2CST
4
0
7
U
0
A
2
B
2
C
1
A
XU
A
1
A
2
D
D
N
G
1
B
-
Q
RI
N
E
P
L
CS
1
D
A
D
S
1
C
2
A
FE
R_
D
D
V
R719
4.7K
7
1
7
C
O
I
V
_
2
6
V
2
I
N
D
O
I
V
_
2
6
V
2
K
L
C
_
H
C
T
A
D
S
_
H
C
T
P
X
_
S
T
M
X
_
S
T
P
Y
_
S
T
M
Y
_
S
T
Q
R
I
_
S
T
6
7
8
9
2G
1G
4G
3G
4
0
7
N
C
1
10
2
3
4
5
M
Y
_
S
T
M
X
_
S
T
P
Y
_
S
T
P
X
_
S
T