LG KG320 - Display Settings; Wallpaper Customization; Menu Colour and Standby Text

(1) Checking VCTCXO Circuit
4. TROUBLE SHOOTING
- 62 -
Check Pin 3.
Refer to Graph
4
-6(b)
26 MHzO.K?
No
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
Yes
Check Pin 4.
Refer to Graph 4-6(a)
2.75V OK?
No
Yes
Changing X400
Check U101
(1608)
X400
2
GND
3
OUT
VCC
4
VCONT
1
26MHz C443
2.2u
C442
NA 1000p
C441
2V75_VVCXO
15K
R415
100
R414
AFC
TEST POINT
CIRCUIT
Waveform
Checking Flow
Graph 4-6(a)
Graph 4-6(b)