LG LG-A270 - Page 45

4. TROUBLE SHOOTING
- 45 -
Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
(2) Checking Mobile SW &FEM
Figure 4.2.2
L300
33n
FILKOR
R370
22
L302 1n
C397
33
L305
33n
FILKOR
FILKOR
33n
C303
10K R392
R394
DNI
SMRH0007101
U300
SKY77550
29
23
24
25
26
27
28
15 16
17 18
19 20
21
22
8 7
6 5 4
3
2
1
14
13
12
11
10
9
Tx_LB_IN
Tx_HB_IN
VSW_EN
BS
RSVD1
RSVD2
GND1 GND2 VBATT1
VBATT2 GND3
GND4 GND5 GND6
GND7
Rx2
RSVD3
Rx1
RSVD TxEN
VRAMP
GND8
GND9
GND10
ANT
GND11
GND12
GND13
PGND
VBAT
22p
C350
220p
C304
1
2
L310 1n
12n
L381
L350
3.6n
24K
R391
33p
C311
DNIC312
DNI
C301
C302
33p
L390
10n
12nL380
2.2p
C306
2.2p
C300
C310
1.5p
1.5pC317
L308 3.3n
L311
3.3n
L312
5.6n
L391
10n
3.6n
L351
5.6n
L306
RF_TX_RAMP
RF_TX_EN
RF_LB_TX
RF_HB_RXN
RF_HB_RXP
GND
RF_HB_TX
RF_2G_BS
RF_LB_RXN
RF_VLOGIC
RF_LB_RXP
TP2
TP3
TP6
TP5
TP4
TP7
TP1
TP7(BS)
TP4
(VLOGIC)
TP5
(V_Ramp)
TP6
(TX EN)
TP2
TP3
Figure 4.2.6
EGSM Rx
TP7 BS
TP4 VLOGIC
TP6 Tx_EN
Figure 4.2.4