Circuit Diagram - LG -T370 Service Manual

8. CIRCUIT DIAGRAM

1-0-1-2 ANT_PAD_Ver1.0
ANT103
1
HJ-BCT-04Y
R107
ANT101
1
FEED
HJ-ICT-03Y
ANT102
FEED
HJ-ICT-03Y
MODE VSW_EN
STANDBY LOW
RX1 HIGH
RX2 HIGH
850/900 TX HIGH
DCS/PCS TX HIGH
LGE Internal Use Only
C110 3.3n
ANT_FEED
C112 C113
0.75p DNI
BS Tx Enable
LOW LOW
LOW LOW
HIGH LOW
LOW HIGH
HIGH HIGH
RF_ANT_SEL[1]
RF_ANT_SEL[0]
R104 1K
RF_TX_RAMP
RF_TX_EN
C115
39p
SW101
2.2n C109
2
ANT_FEED ANT COMMON
1
G3 G4
3 4
L138 L139
C111
DNI DNI
DNI
- 120 -
GND8
15
VRAMP GND6
16 8
GND5
7
TxEN GND4
17 6
GND3
5
RSVD U101
18
VBATT2
GSM850 / DCS SKY77550-21
4
Rx1 VBATT1
19 3
C116 C117 C105
39p 39p 39p
RSVD3 GND2
20 2
GND1
EGSM / PCS
1
Rx2
21
GND7
22
0.5p
L105
L112
5.6n
FL101
1 8
U_P_1960/ B_P_1960/1842_5MHz_1
942_5MHz 9
B_P_1960/1842_5MHz_2
4
U_P_1842_5/
6
881_5MHz
B_P_942_5/881_5MHz_1
2 7
GND1 B_P_942_5/881_5MHz_2
3
GND2
5 10
GND3 GND4
Copyright © 2012 LG Electronics. Inc. All right reserved.
7. CIRCUIT DIAGRAM
RF
C101
R102
RF_HB_TX
12
33p
C102 L101
RF_LB_TX
0
33p
L102
L103
DNI
DNI
C103
C104
VBAT DNI
DNI
C106 C107
C108
33u 10n 15p
(10V,2012) (16V,K,X7R) (50V,J,NP0)
L106
RF_HB_RXN
1.8n
L108
L109
DNI
0.75p
L110
RF_HB_RXP
1.8n
RF_LB_RXN
L111 10n
C114
L113
0.5p DNI
RF_LB_RXP
L114 10n
Only for training and service purposes