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4. TROUBLE SHOOTING
(2) Checking Mobile SW & TX Module
TEST POINT
CIRCUIT
TX_RAMP
GND403
GND404
ANT403
C487
R414
1.2n
DNI
C423
1n
C424
SW401
G2
ANT
RF
G1
7p
TP1
6.8n
C425
C471
C421
1.2p
1p
LGE Internal Use Only
TP5
TP1
TP4
TP5
R413
1K
TX_EN
BS1
BS2
BS3
C461
C454
C464
C463
C466
1n
1n
1n
1n
39p
17
1
GPCTRL2
GND1
16
2
GND9
GND2
15
U404
3
GND8
RFIN_LB
14
4
ANT
GND3
DCS
13
5
RX4
RFIN_HB
12
6
PCS
C470
RX3
GND4
DNI
TP2
GSM850
EGSM
FL403
DCS
C456
33p
1
8
IN_1842_5
OUT_1842_5
0.5p
C457
33p
PCS
4
9
IN_1960
OUT_1960
L402
2
7
GND1
GND2
3
6
GND3
GND4
5
10
GND5
GND6
TP
1805M1880M,1930M1990M
FL402
GSM850
C458
33p
1
8
33n
IN_881_5
OUT_881_5
C467
33p
EGSM
L407
4
9
IN_942_5
OUT_942_5
2
7
GND1
GND2
3
6
GND3
GND4
5
10
GND5
GND6
869M894M,925M960MHz
BS3
BS2
BS1
TX EN
TX Ramp
Figure 4.3.4
CONTROL LOGIC
EGSM Tx
VBAT
TP4
C465
C459
C453
C455
10n
33p
4.7u
4.7u
L416
4.7n
C450
56p
GSM_OUT
L404
3.3n
L403
3.3n
C451
22p
DCS_PCS_OUT
L405
1.5n
C462
1p
BS3
C452
RX34X
1n
Tx_EN
0.5p
L408
C460
RX34
1n
BS1
L409
RX12X
8.2n
L410
12n
BS2
L406
RX12
8.2n
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4. TROUBLE SHOOTING
TP2
TP3
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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