LG GD330 - Page 43

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Only for training and service purposes
4. TROUBLE SHOOTING
Power Amplifier
Module
normal
abnormal
CHECKING FLOW
Fig4-20. PAM placement Fig4-21-1. PAM schematic
Check TP1,TP2 of PAM
ramp
band
txon
TP3
TP4
TP5
PAM is OK.
Check U401
Check Control Signals
from TP3, TP4
and TP5
Check Pin
TP6,TP7 of
PAM
abnormal
Check U401
Replace PAM
abnormal
Fig4-21-2. PAM schematic
TP1
TP2
TP6
TP7
normal
normal
4.2.2.1 PAM Circuit
)CN
(
)
CN(
)CN
(
C4270.01u
924
C
p
0
001
524
C
p
22
100
R402
834C
p2
1
u10.0
6
24
C
1
14
L
Hn65
434C
I
ND
3
MSG_
NIP
2
SCX_NIP
D
NAB
V
1
P
M
A
RV
11
01
NOXTV
204U
MSG
_
SCX
_
21
D
N
G
P
I
ND
04
4
C
VCCFEMC
J3
VCCTX1
J4 J5
VCCTX2
J6
VCCTXVCO
J9
SYSCLKEN
F3
TXBAND
G4
TXMODE TXOUTD
J8 J7
TXOUTG VBAT_IN
H8
G5
GNDTX2 GNDTXVCOD
H6 H7
GNDTXVCOD_B
H4
LDO_CONT
2J
NIXI
MD
1J
BNIXIMD
H3
FEMC1
FEMC2
G3
AUXCLKEN
H5
TP3
TP4
TP5
TP2
TP1
N
IP
N
IP
MSG_T
UOP
4
SCX_
T
UOP
7
V
9
TABV
V
V
B1
0
095
FP
R
MSG_T
UO
RE
L
P
UO
C
5
SCX_TUORELP
U
OC
6
8
C
N
TP6
TP7