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4. TROUBLE SHOOTING
4.8 Checking GSM Block
4.8.1 Checking Tx level
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP2 (G850/G900)
TP3 (G1800/G1900)
TP1
TP6 (GSM_SAW_SW_Mode)
TP5 (G850/G900)
TP4 (G1800/G1900)
rev.1.0.2
8.1dB
REV.D
7.75dB
remain LOW when not transmitting
LOW
HIGH
GSM850
EGSM
C139
100p
39p
C147
4
VBATT
12
VCC
6
VRAMP
2
BS
DCS_PCS_IN
1
15
DCS_PCS_OUT
GND1
5
GND2
8
GND3
10
11
GND4
GND5
13
14
GND6
16
GND7
GND8
17
7
GSM_IN
9
GSM_OUT
TX_EN
3
TQM7M5003
U102
2.2K
R113
R114
200
GND2
3
4
GND3
GND4
6
8
GND5
RFIN
1
5
RFOUT
VC
7
FL102
LMSM32AA-533
2
GND1
51
R105
C137
L118
22u
C128
NA
3.9nH
L117
C127
3.3nH
1.2p
R108
120
120
R107
120
R112
R111
120
R110
56
68p
C148
C129
33nH
C130
NA
GSM_SAW_SW_MODE
DCS_PCS_TX
GSM_TX
GSM_PA_RAMP
GSM_PA_BAND
GSM_PA_EN
+VPWR
rev.B
C101
56p
A
C
G1
G2
KMS-518
SW101
100nH
L103
8
25
GSM850_900TX
GSM900RX1
5
6
GSM900RX2
17
NC
15
UMTS1
UMTS2
16
14
VC1
VC2
13
12
VC3
VC4
11
10
VDD
ANT
GND1
9
18
GND2
GND3
20
21
GND4
GND5
23
24
GND6
26
GND7
27
GND8
GND9
28
GSM1800RX1
1
2
GSM1800RX2
GSM1800_1900TX
22
GSM1900RX1
3
4
GSM1900RX2
7
GSM850RX1
GSM850RX2
FL101
LMSP4LMA-573TEMP
19
[Fig 4.8.1.1] Test point of the GSM TX Block
[Fig 4.8.1.2] Schematic of the GSM TX Block
TP1
TP4
TP5
TP6
TP2
TP3
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