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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
68/140
68/140
(1) Checking Crystal Circuit
4. TROUBLE SHOOTING
TEST POINT
CIRCUIT
WAVEFORM
CHECKING FLOW
1 pin
Figure 4.2.1
X100
#1 pin : 26MHz
26 MHz O.K?
No
Crystal is OK.
See next page to check PLL Circuit
Yes
Replace X100
Figure 4.2.2
Figure 4.2.3
1
1
A
1
1
B
2
1
K
1
1
K
2
B
3
A
3
B
2
A
8
J
7
H
T
S
R
M
_
D
X
R
_
2
F
I
S
U
N
_
S
T
R
_
2
F
I
S
U
N
_
S
T
C
_
2
F
I
S
U
R
S
T
M
_
D
X
T
_
1
F
I
S
U
T
S
R
M
_
D
X
R
_
1
F
I
S
U
N
_
S
T
R
_
1
F
I
S
U
N
_
S
T
C
_
1
F
I
S
U
S
U
L
P
D
S
U
N
I
M
D
X
O
X
O
X
z
H
M
6
2
0
0
0
1
0
S
C
-
A
0
0
S
X
E
0
0
1
X
2
1
3
4
D
N
G
L
A
T
X
1
R
E
T
2
R
E
T
D
X
R
_
T
B
S
T
R
_
T
B
S
T
C
_
T
B
C
O
E
P
D
_
B
S
U
M
D
_
B
S
U
X
R
_
T
R
A
U
X
T
_
T
R
A
U
T
E
S
E
R
_
D
C
L
n
1Pin
Содержание GD350
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