Checking Umts Block - LG U970 Service Manual

4.6 Checking UMTS Block

4.6.1 Checking Tx level
WFL-R-SMT10
ANT SEL0
C161
2.7p
TP2
8.2nH
C169
FL104
SAYZY1G95EB0B00
H
C182 33p
ANT100
Rev.1.2
G1
R100
G2
G3 ANT
0
L100
C102
0.5p
NA
WLNA_OUT
+VPWR
C175 C176 C177
22u
0.01u 100p
TP3
U103
SCDY0003402
C183 100p
C185
L125
0.75p
NA
20dB
Rev. 1.0
R123
R122
51
PWR_DET
51
R124 R125
120 120
8 dB
For testing, Max power of UMT 2100 is needed.
4. TROUBLE SHOOTING
TP1
SW100
C100 56p
G2
ANT RF
G1
KMS-512
L101
100nH
14
VC1
13
2 3
C162 3.3p R120
G1 O1
IN
1
G2 O2
0
5 4
L119
C165
2p
6.8nH
Rev. F
TP4
C178
0.01u
U104
11
GND5
10 1
VCC2 VCC1
9 2
GND4 RFIN
8 3
RFOUT GND1
7 4
GND3 VMODE
6 5
Q100
GND2 VREF
AWT6277R
C186
100p
KRX102E
- 85 -
FL100
1
GSM1800RX1
2
C163
0.75p
L120
WCDMA_MIX_IN_P
3nH
FL103
EFCH1950TDF1
C174
12p
L121
4 5
O1 G3
1
IN
G2 G1
C180 8.2p
L123
3 2
NA C179
NA
8.2nH
PA_R1
VREG_TCXO_2.85V
Rev.I
PA_ON
WCDM
L122
6.8nH