LG C1150 Service Manual page 58

(1) Checking Regulator Circuit
Test Points
Circuit Diagram
Checking Flow
Check Pin 5.
U303. 5
Figure 4-9
VRF
MIC5255-2.85BM5
5
C343
4
C344
0.01u
10u
No
RF 2.85VO.K?
Yes
Regulator Circuit is OK
See next Page to check
VCTCXO
- 59 -
4. TROUBLE SHOOTING
VBAT
U303
1
OUT IN
2
GND
3
BYP EN
C345
4.7u
No
Pin 3.High ?
Yes
Replace U303
U303 . 3
CLKON
Changing the Board