Checking Vcxo Block; Checking Ant. Sw Module; Checking Rf Tx Level - LG U8500 Service Manual

4. TROUBLE SHOOTING

4.5.1 Checking VCXO Block

4.5.2 Checking Ant. SW module

4.5.3 Checking RF TX Level

WCDMA
TP2
C1001
27p
Refer to 4.3
Refer to 4.4
TP4
Test Point (RF TX 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
C1108
0.1u
ANT_SEL0
ANT_SEL1
ANT_SEL2
TP3
SKY77410
U1002
12p C1113
RF_OUT RF_IN
11
5.6nH
C1114
L1002
NA
270
R1011
TX_AGC_ADJ
C1028
0.01u +VPWR
C1037
0.01u
C1032
0.01u
HDET
U1001 LMV225TLX
1.8K
C1031 100p
A1 A2
RFIN_EN VDD
R1013
B1 B2
GND OUT
R1012
PA_ON C1030
G1 10K 1200p
G2
ANT G3
G4
G5
G6
G7
ILNA_OUT
TP3
TP2
ANT1000
C1111 33p
M054E
FXL4T245BQX U1008
1 9 2
VCCA _OE
CTRL1 RX_DCS1
14 4
VCCB CTRL2 RX_DCS2
6 11
T__R CTRL3 RX_PCS1
7 20
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
TP4
C1215 R1015
3
12p
0
C1034
NA
VREG_W_PA
C1026
10u
TR1000
UMC4N
PA_ON
VREG_RFTX_2.85V
VREG_RFTX_2.85V
HDET1
C1007
27p
13 49
PLNA_OUT PGND
14 48
ILNA_OUT GLNA_BIAS
15 47
GLNA_IN
PLNA_BIAS
16
- 82 -
TP1
U1006
12
13
14
15
16
17
3
1
FL1002
EFCH1950TDC1 3
5.6p
C1082
G3 R1031
4 1
OUT IN
G2 G1
0
5 2
L1013
8.2nH
IMT_RX_P
IMT_RX_M
VREG_TCXO_RFR