LG KU250 Service Manual - Page 89
Checking RF Rx Block
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4. TROUBLE SHOOTING 4.7.5 Checking RF Rx Block TP1 TP3 TP2 TP1. DCS RX INPUT TP2. PCS RX INPUT TP3. GSM RX INPUT ANT 11 GSM_PA_RAMP L102 100nH U500 Rev.C 19 VDD 7 8 GND1 GND2 10 GND3 12 GND4 13 GND5 15 17 GND6 20 GND7 21 GND8 23 GND9 GND10 GSM900_RX1 5 6 GSM900_RX2 1 GSM1800_RX1 2 GSM1800_RX2 3 GSM1900_RX1 GSM1900_RX2 4 WCDMA2100 9 D5011 CTRL1 18 CTRL2 22 16 GSM900_TX 14 GSM18001900_TX TP1 1K 1K C110 C109 33p 33p R100 R101 ANT_SEL0 ANT_SEL1 TP2 DCS PCS L115 18nH C124 100p Rev.D L403 1.5nH L116 10nH TP3 C123 0.01u C121 33u +VPWR EGSM Schematic of GSM900/DCS/PCS Rx Block C439 5p C105 NA C440 5p Rev.C 0.5p C190 C442 5.6p C116 NA C443 5.6p NA C191 L405 C120 NA 2.7nH L111 5.6nH L406 2.7nH - 90 -
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4.7.5 Checking RF Rx Block
Schematic of GSM900/DCS/PCS Rx Block
4. TROUBLE SHOOTING
- 90 -
TP1. DCS RX INPUT
TP2. PCS RX INPUT
TP3. GSM RX INPUT
TP1
TP2
TP3
Rev.C
Rev.D
EGSM
DCS
Rev.C
PCS
R101
1K
NA
C191
C442 5.6p
10nH
5p
L116
R100
1K
C440
L406
2.7nH
C124
100p
NA
C120
0.5p
C190
C105
NA
5p
C439
NA
C116
1.5nH
L403
L115
18nH
C123
0.01u
L111
5.6nH
100nH
L102
C121
33u
5.6p
C443
C110
33p
21
14
GSM18001900_TX
GSM1800_RX1
1
GSM1800_RX2
2
GSM1900_RX1
3
4
GSM1900_RX2
GSM900_RX1
5
6
GSM900_RX2
16
GSM900_TX
VDD
19
WCDMA2100
9
ANT
11
CTRL1
18
CTRL2
22
7
GND1
GND10
23
GND2
8
GND3
10
GND4
12
GND5
13
15
GND6
17
GND7
GND8
20
GND9
U500
D5011
33p
C109
2.7nH
L405
+VPWR
GSM_PA_RAMP
ANT_SEL1
ANT_SEL0
TP1
TP2
TP3