LG L601i Service Manual page 77

4. TROUBLE SHOOTING
4.5.1 Checking VCXO Block
Refer to 3.3
4.5.2 Checking Ant. SW module
Refer to 3.4
4.5.3 Checking RF TX Level
Test Point (RF TX Level)
ANT100
0
R643
NA
C101
TP1
TP2
TP3
TP4
TP1
ANT101 ANT102
56p SW100
G2
ANT RF
C100 G1
56p C102
KMS-507
C104
NA
ANT_SEL0
ANT_SEL1
ANT_SEL2
- 78 -
VREG_RFRX_0_2.85V
U100
3 4
AC_T_N
OUT2 VCONT
2 5
GND IN
1 6 R100
OUT1 VDD
10K
UPG2010TB-E3
C106
33p
RF_OUT
FL508
LMSP54MA-543 11
GSM900_RX1
14
VC1 GSM900_RX2
15
VC2
16
VC3 GSM1800_RX1
GSM1800_RX2
13
VDD
GSM1900_RX1
1
GND1 GSM1900_RX2
2
GND2
4
GND3 GSM1800_1900TX
5
GND4 GSM900TX
8
GND5 UMTS2
10
GND6 UMTS1
12
GND7
17
GND8 PIN_DIREC1
18
GND9 PIN_DIREC2
L504
NA
19
20
21
22
23
24
3
6
7
9
25
26