LG C1100 Service Manual page 53

4. Trouble Shooting
(1) Checking Regulator Circuit
Test Points
Circuit Diagram
Checking Flow
Check Pin 5 .
U303. 5
Figure 4-9.
VRF
MIC5255-2.85BM5
C363
C362
10u 0.01u
No
RF 2.85VO.K?
Yes
Regulator Circuit is OK.
See next Page to check
VCTCXO
VBAT
U303
5 1
OUT IN
2
GND
4 3
BYP EN
C361
Pin 3. High ?
Yes
Replace U303
- 52 -
U303. 3
R317 0
CLKON
10u
No
Changing the Board