LG KS660 - Page 83

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Only for training and service purposes
4. TROUBLE SHOOTING
4.9.2. Checking PLL Control signals
Check U402
Yes
No

No
Yes
Control Signal is OK.
See next page to check 
Mobile SW & FEM.
No
Yes
Checking Flow
Check U402
Check U402
Checking Points
Figure 5. Transceiver
RF Transceiver Circuit Diagram
EN Signal(TP1) is OK ?
DA(Data,TP2) is Normal ? 
CLK(Clock,TP3) is Normal ?
TP3 (RF_CLK)
TP2 (RF_DATA)
U402
TP1 (RF_EN)
Waveform
Figure 7. PLL Control Waveform
RF_EN(TP1)
RF_CLK(TP2)
RF_DATA(TP3)
RF Transceiver Circuit Diagram
RF Transceiver Circuit Diagram
5
3
4C
n74
p0001
634
C
FRV
_5
8
V
2
u
1
.0
4
3
4C
u1.
0
1
3
4C
1TO
H
2
T
OH
3
2
34
C
u
1
.
0
z
HM6
2
A
S
5
2
2
3
XN
0
0
4X
2
1DNG
2D
NG
4
1
u1.0
334C
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
371
8V2
O
CV
D
DV
5
1
8V2O
XDDV
11
XO XOX
12
1
D
NG
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
73
SAIBV
4
3
8
1
C
R
_OCV
1
A AX
2 3
B BX
4 7
CLK DA
6
N
E
61
32
FE1
3
3
2
EF
1S
YS
F
4
1
FSYS2
10
9
FSYS3
2
726
B
M
P
2
0
4
U
0
2
8
70
4
R
TS
E
T
_
T
U
O
_
M
6
2
I
X
I
Q
XQ
K
LC_
F
R
AD_
F
R
NE
_F
R
K
L
C
_
T
B
_
1
MI
S
K
L
C
M
_Z
H
M62
TP1
TP3
TP2