LG -T370 Service Manual page 34

SW101
2
ANT_FEED
ANT COMMON
1
G3 G4
3 4
LGE Internal Use Only
RF_ANT_SEL[1]
RF_ANT_SEL[0]
R104 1K
RF_TX_RAMP
RF_TX_EN
C115 C116 C117 C105
39p 39p 39p 39p
2.2n C109
L138 L139
C111
DNI DNI
0.5p
DNI
L105
Figure 3.3.3 FEM CIRCUIT DIAGRAM
GND8
15
VRAMP
16
TxEN
17
RSVD U101
18
GSM850 / DCS
SKY77550-21
Rx1
19
RSVD3
20
EGSM / PCS
Rx2
21
GND7
22
L112
5.6n
FL101
1 8
U_P_1960/ B_P_1960/1842_5MHz_1
9
942_5MHz
B_P_1960/1842_5MHz_2
4
U_P_1842_5/
881_5MHz 6
B_P_942_5/881_5MHz_1
2 7
GND1 B_P_942_5/881_5MHz_2
3
GND2
5 10
GND3 GND4
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3. TECHNICAL BRIEF
C101
R102
12
33p
C102
33p
L102
L103
DNI
DNI
C103
C104
GND6
DNI
8
VBAT DNI
GND5
7
GND4
6
GND3
5
VBATT2
4
VBATT1
3
C106 C107
GND2
C108
2
33u 10n 15p
GND1
1
(10V,2012) (16V,K,X7R) (50V,J,NP0)
L106
1.8n
L108
DNI
L110
1.8n
L111 10n
C114
0.5p
L114 10n
Only for training and service purposes
RF_HB_TX
L101
RF_LB_TX
0
RF_HB_RXN
L109
0.75p
RF_HB_RXP
RF_LB_RXN
L113
DNI
RF_LB_RXP