LG KM710 Service Manual - Page 46
Regulator Circuit
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4.2.1.1 Regulator Circuit C440 C441 4. Trouble Shooting Regulator C440(C441) 2.8V? NO Check U403 YES Regulator is OK. VBAT VCC_SYN REGEN C439 1u C440 4.7u U403 RT9011-MMPQW 1 2 VIN 3 EN1 EN2 4 NC1 8 VOUT1 7 VOUT2 NC2 6 5 9 PGND GND C_VCCRF C441 4.7u Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 47 - LGE Internal Use Only
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- 47 -
4. Trouble Shooting
4.2.1.1 Regulator Circuit
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
Regulat
or
C440(C441) 2
.8V?
NO
YE
S
Ch
eck U403
Regulator is OK.
C440
C441
C439
1u
2
EN1
EN2
3
5
GND
NC1
4
NC2
6
PGND
9
VIN
1
VOUT1
8
7
VOUT2
RT9011-MMPQW
U403
4.7u
C440
VBAT
C_VCCRF
VCC_SYN
4.7u
C441
REGEN