LG GD510 - Page 79

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Trouble shooting
GD510 Operational Description Revision A
LG Electronics 85/113 LGE Property
5.12.2. Checking PLL Control signals
Check U602
Yes
No
G
NoG
Yes
Control Signal is OK.
See next page to check
Mobile SW & FEM.
G
NoG
Yes
Checking FlowG
Check U602
Check U602
TP1 (RF_EN)G TP3 (RF_CLK)G
Checking PointsG
Figure 5. TransceiverG
Figure 6. Transceiver Circuit
Waveform
G
Figure 7. PLL Control Waveform
RF Transceiver Circuit Diagram
EN Signal(TP1) is OK ?
DA(Data,TP2) is NormalGfG G
CLK(Clock,TP3) is NormalGfG
TP2 (RF_DATA)G
U602G
RF_EN(TP1)
RF_CLK(TP2)
RF_DATA(TP3)
TP2
TP3
TP1
R603 820
26MHz
TSX-3225X601
21
3
4
GND2 HOT2
HOT1 GND1
C619 1n
U602
PMB6272
20
19
18
17
16
15
14
13
1
2
21
2
2
11
3
2
01
4
29
5
28
6
27
7
26
8
25
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
1E
F
XA 8V2SA
IB
D
DV
B X
1XR
XB
1X
R
8V2
G
ID
D
DV X2X
R
A
D 2X
R
K
LC
2
DNG
5V
1GI
D
DDV X3XR
3SYSF 3XR 2SYS
F X
4XR
OX
4X
R
X
OX
5V
1A
NLD
DV
GND1
FSYS1
VDDXO2V8
EN
VDDVCO2V8
VCO_RC
VDDRX1V5
VDDRX2V8
100n
C623
47nC627
C649
100n100n
C650
RF_EN
RF_DA
RF_CLK
QX
Q
IX
I
26MHZ_MCLK
BT_CLK
TP1
TP2
TP3