LG KE820 Service Manual page 77

5. Trouble shooting
RTC_OUT
R208
470K
VBAT
FB201
VCHS
PWRON
USB_PU
VBUS_USB
C219
22u
2V72_IO
C226
2.2u
SM-POWE 2V7_V 1V8_
R LDOS CXO MEM
LDO NAME VRF2 VLB
Delay
20 24.2
time(msec)
R202 R203
PWRON VBACKUP
220K 22K
SPOWER_INT
VCH_CTL
_PMRST
1V8_MEM 3V1_USB 1V5_RF VBAT
1
2
3
4
5
L201
6
10uH
7
8
9
10
11
12
C220 C221 C222 C223
22u 2.2u 2.2u 2.2u
2V85_CARD 2V85_IO2 2V85_SIM VBAT
C227 C228 C229 C230
2.2u 2.2u 2.2u 1u
ON
(PWRON)
SM-P
LDOs
1V5_C 1V5_ 2V72
ORE DSP _IO
SW(S VLB VINT
B2 DBB) B1
23.7 26.2 26.2
VCHG 2V11_RTC 1V5_CORE
C207 C208
2.2u 2.2u
36
VCHS VCXOEN
35
VBATS VDDA
34
VRFC VANA
33
ON VSSR
32 R213
U203
VDDPW IREF
31 C216
SW BYP
30
PMB6812
VSSPW VDDAU
29
VSSFB AUOP
28
FB AUON
27
VUPU VSSAU
26
VUSB AUIP
25
VBUS AUIN
VCH_CTL
Delay time
2V65_ 2V85 2V85
ANA _SIM _IO2
VANA VSIM VSIM
1 2
28.1 30.2 32.2
- 78 -
1V5_DSP 2V85_RF VBAT 2V7_VCXO 2V65_BT
C209 C210 C211 C212 C213
2.2u 2.2u 2.2u 2.2u 2.2u
2V65_ANA VBAT
VCXO_EN
82K C217 C218
0.1u
2.2u 2.2u
VCHG
Q201
SI3457BDV C224
S
R217
G
4.7u
100K
D1 D2 D3 D4
D201
CRS08
VCHS
R220 VBAT
0.15
C235
100u
2V85_ 3V1_ 1V5_
CARD USB RF
VMMC VUS VRF
B C
34.3 36.6 628
2V85
_RF
VRF
1
628