LG KS660 - Page 89

- 90 -
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Only for training and service purposes
4. TROUBLE SHOOTING
4.10.3. Checking TX I/Q Signals
Checking Points
I
Q
I
Q
U401
TX
TP1(I)
TP2(IX)TP3(Q)
TP4(QX)
Check TX I/Q Signals(TP1~TP4)
Signals are
Normal ?
Replace
Transceiver
PMB6272(U40
1
Yes
No
TX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Flow
TP4(QX)
TP3(Q)TP2(IX)
TP1(I)
Check TX I/Q Signals(TP1~TP4)
Signals are
Normal ?
Replace
Transceiver
PMB6272(U401)
Yes
No
TX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Flow
5
3
4C
n74
u1.
0
1
3
4C
1TO
H
2
T
OH
3
2
34
C
u
1
.
0
z
HM
62
A
S
5
2
2
3
X
N0
0
4
X
2
1DNG
2D
NG
4
1
u
1
.
0
3
3
4
C
FRV_58V2
F
R
V
_
5V1
VDDBIAS2V8
31
VDDDIG1V5
8 5
VDDDIG2V8
VDDLNA1V5
21
9
3
8V
2
X
I
M
D
D
V
91
5V1
X
R
DDV
8
V
2
XRD
D
V
0
25
3
5V
1
XT
D
DV
8
V
2X
T
D
D
V
8
37
1
8V2
O
CV
D
DV
5
1
8V2O
XDDV
11
XO XOX
12
1
DNG
31
26
GND2
3
D
N
G
0
4
1
4
4
DNG
RX1
29 30
RX1X
RX2
27 28
RX2X
24
RX3
RX3X
25 22
RX4
RX4X
23
1
X
T
6
3
2XT
7
3
S
AI
B
V
4
3
8
1
CR_O
C
V
1
A AX
2 3
B BX
4 7
CLK DA
6
N
E
61
32
FE1
3
3
2
EF
1
S
Y
SF
4
1
FSYS2
10
9
FSYS3
2
726
B
M
P
2
0
4
U
0
2
8
70
4
R
T
S
E
T
_
T
U
O
_
M6
2
I
X
I
Q
XQ
KL
C
_
F
R
AD_
F
R
KLC
_
TB_1MI
S
TP1(I)
TP2(IX)
TP4(QX)
TP3(Q)