Check Rf Rx Level - LG U8500 Service Manual

4.5.5 Check RF Rx Level

TP1
ANT1001
SW1002
C1230
G2
ANT RF
G1
15p
KMS-512
C1112
L1035 L1034
0.5p
4.7nH 15nH
L1031 7.5nH
VREG_RFRX_0_2.85V
ANT_SEL0
ANT_SEL1
ANT_SEL2
TP2
C1001
27p
1.8K
R1013
PA_ON
G1
G2
ANT G3
G4
G5
G6
G7
C1008 12p
TP3
VREG_RFRX_1_2.85V
Bias1
TP4
TP3
Test Point (RF Rx Level)
ANT1000
33p
C1111
M054E
U1006
FXL4T245BQX U1008
1 9 2
VCCA _OE CTRL1 RX_DCS1
14 4
VCCB
CTRL2 RX_DCS2
6 11
C1108 T__R CTRL3 RX_PCS1
7 20
0.1u
GND1 CTRL4 RX_PCS2
8
GND2 RX_EGSM1
15
BGND RX_EGSM2
13 2 8
B0 A0 UMTS TX_DCSPCS
12 3
B1 A1
TX_EGSM
11 4
B2 A2
10 5
B3 A3
U1001 LMV225TLX
C1031 100p
A1 A2
RFIN_EN VDD
B1 B2
GND OUT
R1012
C1030
10K 1200p
ILNA_OUT
L1004 100nH
L1001 2.7nH
R1003
0
C1043 C1045
1.2p 680p
C1049 C1048
0.1u 10p
C1058 C1056
0.1u 10p
C1014
0.1u
4. TROUBLE SHOOTING
TP4
12
13
14
15
C1047 R1048
16
ILNA_OUT
17
0
8.2p
3
1
L1005
2.2nH
VREG_RFTX_2.85V
HDET1
C1007
27p
13
PLNA_OUT
14
ILNA_OUT
15
PLNA_BIAS
16
PLNA_IN
17
ILNA_BIAS
18
ILNA_IN
19
EUSY0246001
VDDRF3
20
RX_IP
21
RX_IM
22
RX_QP
23
RX_QM
24
VDDA2
RX_QM
R1004
RX_QP
0
RX_IM
C1016
C1012 RX_IP 470p
100p
- 85 -
TP2
TP1
C1055 33p
L1011
3.9nH
FL1001
2 3
C1060 0.1u
G1 O1
1 L1007
IN
33nH
G2 O2
LN04A
5 4
L1010
3.9nH
C1054 33p
VREG_TCXO_RFR
49
PGND
48
GLNA_BIAS
47
GLNA_IN
46 R1008
R_BIAS
45 11K
VDDA8
44
SBST
SBST
43
SBDT
SBDT
42
SBCK SBCK
U1000
41
VDDM
40
GRX_IP
39
GRX_IM
38
GRX_QP
37
GRX_QM
C1018
C1017 0.01u
3.9n
IMT_RX_P
IMT_RX_M
C1020 C1019
10p 1u