LG -T500 Service Manual page 70

(2) Checking Mobile SW &TX Module
TEST POINT
CIRCUIT
TP4
C118
17
DNI
16
15
SW101
L114 L103 C123
2 14
ANT_FEED ANT COMMON
2.2n 2.2n
1 13
100p
G3 G4 TP1
12
3 4
C112
1.2p
LGE Internal Use Only
TX Ramp
ANT_SEL[0]
TP3
TP2
SW101
Figure 4.2.4
VBAT
C103
C101 C102
22u
10n 33p
1K R105
C108 C109 C110 C111
1n 1n 1n 39p
1
NC3 GND1
2
GND9 GND2
C119 56p
U101 3
GND8 RFIN_LB
4
ANT GND3 L105 3.3n L106 3.3n
C120 22p
5
NC2 RFIN_HB
6
RX1 GND4
L107
1.5n
C115
1p
TP
GND
C116 4.7p
L108
L115
4.3n
GSM900/PCS 6.8n
FL101
C121
C117 4.7p
1 I1 9
O1-1
100p
8 TP3
O1-2
7
O2-1
C122 L110 15n
4 6
I2 O2-2
100p
2 3 5 10
GSM850/DCS
L116
L111
6.8n
DNI
L113 15n
U101
TP1
WAVEFORM
EGSM Tx
RF_ANT_SEL[1]
RF_ANT_SEL[0]
RF_TX_EN
RF_TX_RAMP
ANT_SEL[1]
RF_LB_TX
RF_HB_TX Tx_EN
ANT_SEL[0]
RF_HB_RXP
L109
4.3n
RF_HB_RXN
RF_LB_RXP
L112
DNI
RF_LB_RXN
- 70 - Copyright © 011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
TX EN
ANT_SEL[1]
TP4
Only for training and service purposes