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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
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4.4.1 DCXO Part
Is the waveform
of Pin1 similar to
DCXO(X101)
Waveform?
Replace X101
Yes
No
DCXO Circuit is OK.
See next page to check
PLL Circuit.
< DCXO Circuit>
<DCXO Waveform>
Waveform
Pin 1
Frequency
X101
Checking Points
C107
R105
CHECKING FLOW
< DCXO Placement>
W-191-866
X101
GND1 2
4
GND2
HOT1
1
3
HOT2
26MHz
C112
4.7p
R104
220K
C109
10p
C108
0.5p
XTAL
D15
U2
SPARE2
U1
SPARE3
NC12
G12
NC13
L11
K11
NC14
NC15
J11
H11
NC16
L10
NC17
NC18
K10
J10
NC19
NC8
K12
NC
9
J12
NC10
NC11
H12
R105
1.5M
1000p
C107
D
TP1