LG C1100 Service Manual page 45

4. Trouble Shooting
(1) Checking Regulator Circuit
Test Points
Circuit Diagram
C362
10u
Checking Flow
Check Pin 5.
U303. 5
VRF
MIC5255-2.85BM5
5
OUT
C363
4
BYP
0.01u
RF 2.85V O.K?
Yes
Regulator Circuit is OK
See next Page to check
VCTCXO
Figure 4-2.
VBAT
U303
1
IN
2
GND
3
EN
C361 10u
No
Pin 3. High ?
Yes
Replace U303
- 44 -
U303. 3
R317 0
CLKON
No
Changing the Board