LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.5.3 Checking RF Rx Block
TP1. GSM850 Rx Input
TP2. GSM900 Rx Input
TP3. PCS Rx Input
TP4. DCS Rx Input
TP1
TP3
TP2
TP4
L106
6.8nH
L119
27nH
27nH
L116
17
NC
15
UMTS1
UMTS2
16
GSM1800RX1
1
2
GSM1800RX2
GSM1800_1900TX
22
GSM1900RX1
3
4
GSM1900RX2
7
GSM850RX1
GSM850RX2
8
25
GSM850_900TX
GSM900RX1
5
6
GSM900RX2
P4LMA-573TEMP
U101
19
ANT
12nH
L107
C17
12p
R104
12K
680
R106
L110
6.8nH
6p
C5
C9
12p
68nH
L112
15nH
L102
L101
6.8nH
L117
47nH
NA
L109
1.8nH
L704
4p
C8
L105
6.8nH
27nH
L114
C822
1p
R102
5.6nH
56nH
L113
L104
NA
47nH
L118
C6
6p
L111
27nH
56p
C18
T
R_BIAS1
3
R_BIAS2
27
SBDT
14
VCONTROL
56
55
ENV_OUT
GCELL_INN
30
GCELL_INP
31
GPCS_INN
37
36
GPCS_INP
HB_RF_OUT1
46
HB_RF_OUT2
44
43
LB_RF_OUT1
LB_RF_OUT2
42
24
RF_ON
R
22
CAL INP
54
DAC_REF
DCS_INN
39
38
DCS_INP
EGSM_INN
33
32
EGSM_INP
C15
56p
C16
NA
WCDMA_1900
WCDMA_850
DAC_REF
TX_ON
SSBDT_RTR
TX_AGC_ADJ
WCDMA_850_TX_OUT
WCDMA_1900_TX_OUT
DCS_PCS_TX
GSM_TX
Schematic of GSM850/GSM900/DCS/PCS Rx Block
TP4
TP1
TP2
TP3