LG KM500 Service Manual page 46

4.2.1.1 Regulator Circuit
X400
U402
U404
SW400
FL400
TP1_RF TP2_RF
REGEN
C443(C444)
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
U401
U400
U403
TP4_RF TP5_RF
VBAT
C442
1u
RT9011-MMPQW
1
VIN
2
EN1
3
EN2
4
NC1
Regul ator
C443(C444) 2.8V?
NO
Check U101
TP1_RF
C443
4.7u
U404
8
VOUT1
7
VOUT2
6
NC2
C444
GND
5
4.7u
9
PGND
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4. Trouble Shooting
YES
Regul ator i s OK.
VCC_SYN
C_VCCRF
TP2_RF
LGE Internal Use Only