LG GD510 - Page 85

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Only for training and service purposes
5. Trouble shooting
GD510 Operational Description Revision A
LG Electronics 91/113 LGE Property
5.13.3. Checking TX I/Q Signals
;
Checking PointsG
Figure 18. TX I/QG
I
Q
I
Q
Figure 19. TX I/Q Waveform
G
U401G
TX
TP1(I)G
TP3(Q)
TP4(QX)
TP2(IX)G
Figure 17. TX I/Q
Check TX I/Q Signals(TP1~TP4)
Signals are
Normal ?
Replace
Transceiver
PMB6272(U602)
Yes
No
TX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Flow
TP4(QX)G
TP3(Q)GTP2(IX)G
TP1(I)G
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(I)
TP2(IX)
TP3(Q)
TP4(QX)
Figure 17. Tx I/Q
GD510 Operational Description Revision A
LG Electronics 91/113 LGE Property
5.13.3. Checking TX I/Q Signals
;
Checking PointsG
Figure 18. TX I/QG
I
Q
I
Q
Figure 19. TX I/Q Waveform
G
U401G
TX
TP1(I)G
TP3(Q)
TP4(QX)
TP2(IX)G
Figure 17. TX I/Q
Check TX I/Q Signals(TP1~TP4)
Signals are
Normal ?
Replace
Transceiver
PMB6272(U602)
Yes
No
TX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Flow
TP4(QX)G
TP3(Q)GTP2(IX)G
TP1(I)G