LG KE770 Service Manual page 92
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Also See for KE770:
- User manual (233 pages) ,
- User manual (103 pages) ,
- User manual (108 pages)
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5.12.4 VCTXO Circuit
Test Points
Pin 3
Figure 4-9
Waveform
Check Pin 3.
Refer to Graph
Check Pin 4
Pin 1
Checking Flow
26 MHz O K?
No
2.7V OK?
No
check C430
ok?
Yes
Change the board
Circuit Diagram
2V7_VCXO
X401
3
1
OUT
VCONT
4
2
VCC
GND
C430
26MHz
1u
- 93 -
5. Trouble shooting
VCTCXO Circuit is OK
Yes
See next Page to check
ANT SW & Mobile SW
Yes
Changing X401
No
Re soldering R505
R413
0
C431
22p
AFC
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Troubleshooting
