LG C1150 Service Manual page 59

4. TROUBLE SHOOTING
(3) Checking Ant SW & Mobile SW
Test Points
X 301. 3 X 301. 4
Figure 4-10
Waveform
Circuit Diagram
R311
100
C337
2.2u
(1608)
Graph 4-5(a)
VVCXO
X301
3 1
OUT CTL
4 2
VCC GND
13MHz
Checking Flow
Check Pin 3. 13 MHzO.K?
Refer to Graph 2-11
No
2.75V OK?
Check Pin 4.
Refer to Graph2-22
No
Check U101, PMIC
Graph 4-5(b)
R312
15K
C335
1000p
- 60 -
VCTCXO Circuit is OK
Yes
See next Page to check
ANT SW & Mobile SW
Yes
Changing X301
AFC AD6535_AFCDAC