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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
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LGE Property
4.12.1 Checking DCXO Circuit
Replace X501
No
Yes
DCXO Circuit is OK.
See next page to check
PLL Circuit.
TP1(C534) : 26MHz
Figur2. DCXO
DCXO Circuit Diagram
Figure 3. DCXO Cicuit
Waveform
Figure 4. DCXO Waveform
Is the waveform
of TP1(C534) similar to Fig.4?
TP1 (C534)
X50
Checking Flow
Checking Points
26MHz
X501
TSX-3225
2
1
3
4
GND2
HOT2
HOT1
GND1
U501
20
19
18
17
16
15
14
13
1
2
2
1
2
2
1
1
3
2
0
1
4
2
9
5
2
8
6
2
7
7
2
6
8
2
5
9
2
4
0
3
3
1
3
2
2
3
1
33
34
35
36
37
38
39
40
41
GND4
GND3
VDDMIX2V8
VDDTX2V8
TX2
TX1
VDDTX1V5
VBIAS
FE2
A
1
EF
X
A
8
V2
S
AI
B
D
D
V
B
X1
X
R
X
B
1
X
R
8
V2
GI
D
D
D
V
X2
X
R
A
D
2
X
R
KL
C
2
D
N
G
5
V1
GI
D
D
D
V
X3
X
R
3
S
Y
SF
3
X
R
2
S
Y
SF
X4
X
R
O
X
4
X
R
X
O
X
5
V1
A
NL
D
D
V
GND1
FSYS1
VDDXO2V8
EN
VDDVCO2V8
VCO_RC
VDDRX1V5
VDDRX2V8
0.001uF
C534
C535
0.047uF
R510
820ohms
RF_EN
26MHZ_MCLK
TP1(C54)
1
Содержание GM360i
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