LG L240 Service Manual page 43

4. TROUBLE SHOOTING
4.2.1.1 Regulator Circuit
C74 7
U70 4
R71 5
R71 4
U70 3
C74
C74 4
7
VBAT
R714
VRIO
0
C745
0.1u
VBAT
R715
SYSCLKEN
100K
C748
0.1u
C747(C744) 2.8V(1.8V)?
R715(R715) High?
Check U101
VCC_1.8V
TPS79918DRVR U703
6 1
IN OUT
5 2
NC NR C744
4 3
EN GND 2.2u
7
PGND
C746
0.01u
VCC_2.8V
TPS79928DRVR U704
6 1
IN OUT
5 2
NC NR C747
4 3
EN GND 2.2u
7
PGND
C749
0.01u
- 44 -
Regulator
YES
NO
YES
NO
Regulator is OK.
Replace U704
(U703)
C747
C744