LG KU800 Service Manual page 93

4. TROUBLE SHOOTING
4.7.5 Checking RF Rx Block
EGSM RX
PCS RX
DCS RX
DCS RX.
EGSM RX.
R1012
15
R1013
15
C1034
Test Point (RF Tx Level)
PCS RX.
L1009
3.9nH
1805-1880 MHz
L1012
3.9nH
925-960 MHz
FB1000
C1028
smd_0603h_3_r
10u
C1031
33p
R1015 100
VB SW2
Schematic of GSM/DCS/PCS Rx Block
- 94 -
L1001
2.7nH
L1003
1930-1990 MHz 3.3nH
L1007
2.7nH
VREG_RFTX_2.85V
R1003 R1004
(1%)
4.7K 4.3K
ECHU1C682JX5
C1014
680p
6.8n
C1011 smd_0603h_3_r
(PPS)
C1016
10n
CP2_OUT
RX_VCO_IN
R1006
11.3K
(1%)
R1008
R1007 15
(1%)
0
C1020 C1021
R1011 33
120p 330p
C1024
(PPS)
5.6n
VREG_RFTX_2.85V
VREG_MSMP_2.7V
R1014 100
GSM_TX_VCO_0_EN_N
smd_0603h_3_r C1009
33p
CP_HOLD2
29
CP2
30
VDDA9
31
RX_VCO_IN
32
R_BIAS
33
GSM1800_INN
34
GSM1800_INP RTR6250D
35
VDDA10 U1001
36
GSM900_INP
37
GSM900_INN
38
VDDA11
39
TX_MOD_CP
40
VDDA12
41
TX_VCO_FB
42
C1025
82p
C1033
10n
smd_0603h_3_r