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LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
]YVX[W
ʹΠΡΪΣΚΘΙΥ͑ι ͣͨ͑͡͡ͽ͑ͶΝΖΔΥΣΠΟΚΔΤ͑͟ͺΟΔ͑͑͟ͲΝΝ͑ΣΚΘΙΥ͑ΣΖΤΖΣΧΖΕ͑͟
ΟΝΪ͑ΗΠΣ͑ΥΣΒΚΟΚΟΘ͑ΒΟΕ͑ΤΖΣΧΚΔΖ͑ΡΦΣΡΠΤΖΤ
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
(2) Checking Mobile SW &FEM
4. TROUBLE SHOOTING
TEST POINT
CIRCUIT
Figure 4.2.4
CONTROL LOGIC
EGSM Tx
VLOGIC
Tx_EN
BS
BS1
VLOGIC
V_ Ramp
TX EN
BS
TP1
SW301
TP3
TP2
C306
9p
C311
9p
C312
9p
33n
C308
10u
C314
1n
C301
1K
R302
0.5p
C320
1n
C304
C310
9p
NMS-306
ENWY0007601
SW301
2
G
T
N
A
F
R
1
G
C305
0.01uF
100p
C323
SKY77542
SMRH0006001
U301
33
32
31
05
94
84
74
64
45
44
43
42
41
40
93
83
73
61
51
41
31
21
11
01
63
53
43
17
9
18
8
19
7
20
6
21
5
22
4
23
3
24
2
52
62
72
82
92
03
1
GND1
02
D
N
G
91
D
N
G
81
D
N
G
71
D
N
G
61
D
N
G
51
D
N
G
GND2
GND14
DCS_TX
ANT
GND3
GND10
GSM_TX
GND9
GND4
GND8
VBATT
GND7
GND5
RSVD2
VLOGIC
GSM_RX
4
D
N
G
P
5
D
N
G
P
6
D
N
G
P
P
M
A
R
V
N
E_
X
T
S
B
D
V
S
R
6
D
N
G
X
R_
S
C
D
1
D
V
S
R
7
D
N
G
P
8
D
N
G
P
9
D
N
G
P
PGND10
PGND11
PGND12
PGND13
PGND14
PGND15
61
D
N
G
P
71
D
N
G
P
81
D
N
G
P
91
D
N
G
P
02
D
N
G
P
PGND1
PGND2
PGND3
33n
C319
39p
C303
1n
C309
DNI
C328
SFSB0001401
FL301
B9308
10
5
3
2
6
4
7
8
9
1 I1
O1_1
O1_2
O2_1
I2
O2_2
1
G
2
G
3
G
4
G
L302
18n
1.2pF
C313
L304
1.5n
2.2nH
L305
L306
2.2nH
VBAT
ANT303
3.6n
L303
R305
100ohms
R307
100ohms
R308
100ohms
L308
1.2n
ANT305 ANT306
V_RAMP
TX_EN
GSM_OUT
DCS_RXN
DCS_RXP
GSM_RXN
GSM_RXP
DCS_PCS_OUT
BS
VLOGIC
TO PART_NO SFSB0001301(B9310)
IN CASE OF GSM850/PCS1900
CHANGE THIS MODULE
IN CASE OF GSM850/PCS1900
TO PART_NO SMRH0005901(SKY77543)
TO PART_NO ELCH0003844(2nH,LQG15HS2N0S02)
CHANGE THIS L308
IN CASE OF GSM850/PCS1900
TO PART_NO ECCH0001001(6.8pF,C1005C0G1H6R8DT)
CHANGE THIS C323
IN CASE OF GSM850/PCS1900
DNI_CAP_1005
IN CASE OF GSM850/PCS1900
CHANGE THIS C320
10 uF,10V ,Z ,Y5V ,HD ,2012 ,R/TP
CHANGE THIS DUAL SAW FILTER
CHANGE THIS C319
IN CASE OF GSM850/PCS1900
DNI_IND_1005
TP2
TP
TX_EN
V_RAMP
TP1
TP2
TP3