Checking Umts Block - LG KF310 Service Manual

4.15 Checking UMTS Block

4.15.1 Checking TX level
TP1
C1005
56p
R1005
L1001
100nH
SW1000
KMS-518
2
GND1
3
GND2
8
GND3
10
GND4
20
GND5
22
GND6
23
GND7
24
GND8
1
ANT
1.8nH
L1012
18p
C1082
C1099
1nH
WCDMA_RX_HB
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
15nH
C1001 C1002
L1000
33p 0.1uF
FL1000
DGM129M01
11
GSM850_EGSM_TX
9
PCN_PCS_TX
18p C1014
21
WCDMA_2100
13
GSM850_RX2
12
GSM850_RX1
15
EGSM_RX2
14
EGSM_RX1
17
PCN_RX2
16
TP2
PCN_RX1
19
PCS_RX2
18
PCS_RX1
WCDMA
GND3 GND4
GND2 GND5
GND1 GND6
U1003
RX
LDC151G8820Q-359
C1087 C1088
SCDY0003801
ANT TX
1.5nH
5.6p
FL1002 B7643
C1096
DNI
C1100
33p
51
R1028
R1027
47
R1029 R1030
130 130
S21 : -7.2 dB
S11 : -42 dB
L1019
1nH
[Fig.] Schematic of the WCDMA Tx Block
[Fig.] Test Point of the WCDMA Tx Block
- 95 -
4. TROUBLE SHOOTING
VREG_S3_2.7V
ANT_SEL0
ANT_SEL1
ANT_SEL2
TP3
+VPWR
C1092 C1093 2.2u
0.01u 120p
C1089
2.2p
C1091
ACPM-7381 U1004
11
PGND
10 1
VCC2 VCC1
9 2
GND3 RFIN
8 3
RFOUT VMODE1
7 4
PDET_IN GND2 VMODE0
6 5 NA
GND1 VEN
L1017
C1103
22p
TP4
C1094 0.01u
PA_ON0
R1026
SFSY0031101
EFCH1950TDF1
1.8nH FL1003
4 5
L1016 2.7nH
O1 G3
1
W_TX_HB_OUT
IN
G2 G1
3 2
C1104
L1018
DNI
NA
PA_R0
LGE Internal Use Only