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4. TROUBLE SHOOTING
(2) Checking Mobile SW & TX Module
TEST POINT
CIRCUIT
TP5
TP5
R319
1K
TX_RAMP
TX_EN
BS1
BS2
VLOGIC
C345
TP1
17
GPCTRL2
16
GND9
15
GND8
14
ANT
13
DCS
RX4
12
PCS
RX3
C348
DNI
GSM850
EGSM
FL307
SAWEN1G84BK0F00
C368
33p
DCS
1
IN_1842_5
C369
33p
PCS
4
IN_1960
2
GND1
3
GND3
5
GND5
FL308
SAWEN881MBK0F00
GSM850
C370
33p
1
IN_881_5
C371
33p
EGSM
4
IN_942_5
2
GND1
3
GND3
5
GND5
LGE Internal Use Only
Figure 4.3.4
VBAT
TP4
39p
C344
C331
C332
10n
33p
100u
1
GND1
2
GND2
C366
56p
U304
3
RFIN_LB
4
L303
3.3n
L302
3.3n
GND3
C367
22p
5
RFIN_HB
6
GND4
L301
1n
C341
1p
TP2
C334
RX34X
5.6n
8
OUT_1842_5
L306
L315
9
18n
DNI
OUT_1960
C340
7
GND2
RX34
6
GND4
5.6n
10
GND6
TP
L311
6.8n
RX12X
8
OUT_881_5
L308
C376
12n
9
DNI
OUT_942_5
L312
6.8n
7
GND2
RX12
6
GND4
10
GND6
4. TROUBLE SHOOTING
CONTROL LOGIC
EGSM Tx
GSM_OUT
DCS_PCS_OUT
VLOGIC
Tx_EN
BS1
BS2
71/136
71/140
71/140
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Copyright © 2010 LG Electronics. Inc. All right reserved.
TP5_TXRAMP
TP4
TP3
TP2
TP1
Only for training and service purposes
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