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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.6.2 Checking RF Tx Level
PQ
C104
1.2p
ANT101
C115
47p
47p
C113
NA
L102
A
C
G1
G2
KMS-518
SW100
120p
C101
12
GND5
14
GND6
GND7
15
GND8
17
18
GND9
NC
7
PCS_RX1
22
PCS_RX2
21
25
PGND1
26
PGND2
8
UMTS_TX_RX
VC1
5
4
VC2
VC3
3
VDD
6
ANT
10
DCS_PCS_TX
13
DCS_RX1
20
19
DCS_RX2
EGSM_RX1
24
23
EGSM_RX2
EGSM_TX
16
1
GND1
2
GND2
GND3
9
11
GND4
FL100
LSHS-M090UH
47p
C114
ANT100
0
L100
C102
12nH
L101
4.7nH
ANT102
ANT_SEL2
ANT_SEL0
ANT_SEL1
PQ
C138
NA
C142
0.75p
8p
C136
L113
14
GND6
GND7
16
17
GND8
7
GSM_IN
9
GSM_OUT
3
TX_EN
VBATT
4
12
VCC
VRAMP
6
4.7nH
TQM7M5003
U101
2
BS
DCS_PCS_IN
1
DCS_PCS_OUT
15
5
GND1
GND2
8
10
GND3
11
GND4
13
GND5
15nH
L112
C146
10p
Schematic of the GSM Tx Block
Test Point of GSM Tx Block
TP1
TP2
TP3
TP1
TP2
TP3
Содержание U990
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