Table of Contents
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4.8. Touch trouble
Check Points
- Touch driver IC soldering`
- FPCB_Folder Crack
2
V
6
2
_
V
O I
T
S
_
X
P
T
S
_
R I
Q
T
S
_
Y
P
C
7
1
4
C
7
1
5
D
I N
D
I N
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
U
7
0
4
T
S
C
2
0
0
7
Y I
Z
G
R
A
1
C
1
A
U
X
S
D
A
A
2
C
2
V
D
D
_
R
E
F
A
1
A
3
C
3
X
+
- X
B
1
D
1
P
E
N
R I
Q
-
S
C
L
B
2
D
2
A
0
G
N
D
B
3
D
3
Y
+
- Y
C
7
1
6
D
I N
START
PinA2 of Touch driver
IC(U704) is high(2.62v)?
Yes
Pin1 of CN704 is
high?
Yes
FPCB is Crack?
Yes
Replace Touch Window
- 81 -
2
V
6
2
_
V
O I
T
S
_
X
P
T
S
_
Y
P
T
S
_
X
M
T
S
_
Y
M
T
C
H
_
S
D
A
T
S
_
X
M
T
C
H
_
C
L
K
T
S
_
Y
M
C
7
1
7
D
I N
Check 2.62V
No
No
Resolder CN704
No
Check and Replace
U704
4. TROUBLE SHOOTING
C
N
7
0
4
G
1
G
2
1
1
0
2
9
3
8
4
7
5
6
G
3
G
4
LGE Internal Use Only
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Table of Contents
Troubleshooting
