Checking Gsm Tx Module(Gsm Pam + Fem) Block - LG -P715 Service Manual

4.4 Checking GSM TX Module(GSM PAM + FEM) Block

GSM_PA_RAMP
GSM_HB_TX
DCS(1710-1785 MHz)
PCS(1850-1910 MHz)
GSM_LB_TX
GSM850(824-849MHz)
GSM900(880-915MHz)
2mm
+VPWR
C1032
10u
TP1(VBATT)
ANT_SEL3
ANT_SEL2
ANT_SEL1
ANT_SEL0
LGE Internal Use Only
TP1(VBATT)
0603
R1002
2.2K
C1015
39p
R1003
68
R1004 R1005
10dB Atten
100 100
R1007
68
R1009 R1008
10dB Atten.
100 100
0603
C1033
0603
47p
Schematic of the TX Module
1
HB_IN
2
GND1
3
LB_IN
4
VAPC
5
U1002
VBATT
6
BS2
7
BS1
8
FEM
TXEN_
29
PGND1
30
PGND2
31
PGND3
32
PGND4
33
PGND5
34
PGND6
- 55 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
44
PGND16
43
PGND15
42
PGND14
41
PGND13
22
GND5
21
GND4
20
GND3
19
GND2
18
ANT
17
WCDMA3
16
WCDMA2
15
WCDMA1
40
PGND12
39
PGND11
38
PGND10
Only for training and service purposes