LG KS660 - Page 82

- 83 -
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
4.9.1. Checking DCXO Circuit
Replace X400
No
Ye s
DCXO Circuit is OK.
See next page to check
PLL Circuit.
Checking Flow
TP1(C438) : 26MHz
Checking Points
Figur2. DCXO
DCXO Circuit Diagram
Figure 3. DCXO Cicuit
Waveform
Figure 4. DCXO Waveform
Is the waveform
of TP1(C438) similar to Fig.4?
X40
TP1 (C438)
TP1
Waveform
Figure 4. DCXO Waveform
TP1 (C438)
Figure 3. DCXO Cicuit
p
00
0
1
63
4
C
1
TO
H
2
T
OH
3
z
HM
62
A
S
5
2
2
3
XN
0
0
4X
2
1DN
G
2D
NG
4
1
7
1
5
1
8V2O
X
D
D
V
11
XO XOX
12
1
D
NG
3
1
N
E
6
1
1
S
Y
S
F
41
FSYS2
10
9
FSYS3
NE
_
FR
K
L
C
_
T
B
_
1
MI
S
K
L
C
M
_Z
H
M
6
2
TP1