LG KG245 Service Manual page 55

4. TROUBLE SHOOTING
(1) Checking Regulator Circuit
TEST POINT
CIRCUIT
CIRCUIT
Voltage at
Pin5 of U403
YES
Regulator Circuit is OK
See next Page to check
U403. 3
(EN)
Figure 4-6 (a). Regulator Circuit
VBAT
CLKON
C444
R419
100K 1u
Figure 4-6 (b). Regulator Circuit
NO
Is 2.85V?
VVCXO
U403
U403. 5
(OUT)
RF2V85
U403
1 5
IN OUT
2
GND
3 4
EN BYP
MIC5255-2.85BM5
C445
0.01u
Level at NO
Pin3 of U403
Is high?
YES
Replace U403
- 56 -
C446
4.7u
Change main board