LG KS660 - Page 86

- 87 -
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
4.9.4. Checking RX I/Q Signals
Checking Points
U601
TP1(I)
TP2(IX) TP3(Q)
TP4(QX)
I
I
Q
Q
RX
Check RX I/Q signals(TP1~TP4)
Signals are
Normal?
Replace
Transceiver
PMB
6
272
(U
60
1
)
Yes
No
RX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Flow
TP2(IX) TP3(Q)
TP4(QX)
TP1(I)
5
3
4
C
n
7
4
u1.0
134
C
1
TO
H
2T
OH
3
2
34C
u
1
.0
z
HM
6
2
A
S
5
2
2
3
XN
00
4X
2
1DN
G
2DNG
4
1
u1.0
334C
FR
V_5
8
V
2
F
R
V
_5V1
VDDBIAS2V8
31
VDDDIG1V5
8 5
VDDDIG2V8
VDDLNA1V5
21
9
3
8V
2
XIMDDV
9
1
5
V
1X
RDDV
8V2X
R
D
D
V
0
25
3
5
V
1
XTDD
V
8
V
2
X
TDDV
8
37
1
8
V
2OC
VDD
V
5
1
8
V
2
OX
D
D
V
11
XO XOX
12
1
D
NG
3
1
26
GND2
3
DNG
04
1
4
4D
N
G
RX1
29 30
RX1X
RX2
27 28
RX2X
24
RX3
RX3X
25 22
RX4
RX4X
23
1X
T
63
2
XT
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
6
1
32
FE1
3
3
2EF
1
S
Y
SF
41
FSYS2
10
9
FSYS3
2
72
6
B
MP
204U
0
2
8
7
0
4R
T
S
E
T_TUO_M
6
2
I
X
I
Q
XQ
KL
C
_
FR
A
D
_
FR
K
L
C
_
T
B
_
1
MIS
TP1(I)
TP2(IX)
TP4(QX)
TP3(Q)