LG KU950 - Checking Vco Block

4.6.1. Checking VCO Block
Test Point (TXVCO LEVEL)
Schematic of RF TXVCO
4. TROUBLE SHOOTING
- 98 -
(2012)
(PPS)
Dual VCO
C137
33p
220
R116
R124
270
R109
82
C127
8200p
R119
51
15
R122
C125
120p
C147
1.8p
C141
15p
10u
C136
R117 100ohm
C139
15p
15
R112
R120
220
100ohmR118
1005/600 ohm
FB100
270
R115
C138
0.1u
C134
82p
VREG_RFTX_2.85V
GND1
2
GND2
4
GND3
6
7
GND4
GND5
8
GND6
12
13
GND7
GND8
14
5
OUT_DCSPCS
1
OUT_GSM
9
SW1
11
SW2
3
VBVC
10
U102
MQW5V0C869M
0.5p
C132
R114
47
C126
1000p
GSM_TX_VCO_1_EN_N
GSM_TX_VCO_0_EN_N
TP1
TP3
TP5
TP4
TP6
TP2