Power On Trouble - LG GX500 Service Manual

GX500 Operational Description

4.2 Power on Trouble

Check Points
-Battery Voltage( Need to over 3.35V)
-Power-On Key detection (PWRON signal)
-Outputs of LDOs from PMIC
Figure 4-1. Remote Power On Circuit
USB_OEN
USB_DAT_VP
USB_SE0_VM
1V8_SD 2V5_VAUDB VBAT
TXON_PA
VBAT
2V5_VAUDA 2V85_VFM
SIM1_USB_DP
SIM1_USB_DM
PMRSTN
220
VCXO_EN
SIM1_BT_VCXO_EN
TP203
C230 C245 C243
2.2u 2.2u 1u
C240
C204 C208 C213 C209 C216
C241 C247 C224
0.1u
10u 2.2u 0.1u
10u 10u 22u 2.2u
Figure 4-2. PMIC Circuit
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LG Electronics
TP1
Remote Power On
RPWRON_EN
RPWRON
R209
END_KEY
10K
VUSB VBAT
VBAT
1V35_VPLL 2V62_VIO
C212
C214
C237
VBAT
0.1u
2.2u 1u
B1
RCV
C2
VPIN
D3
VMIN
C1
D+
D2
D-
E3
RESET_N
D1
RESET2_N
E2
SLEEP1_N
E1
SLEEP2_N
F2
VAUDIOA
F1
VDDAUDIOA
G2
VDDAUDIOB
G1
VAUDIOB
H2
VAUX
H1
VDDAUX
J1
SU1_GATE
J2
SU1_GND
H3
SU1_FB
J3
SU1_ISENSE
K1
VDDSD2
K2
SD2_FB
L2
SD2_FBL
2.2u
2V11_RTC
KEY_COL2
VA204
3 2 1
Q201
4 5 6
KEY_ROW4
PMIC
2V62_VIO
C217
2.2u
VBAT
VBAT
C206
100u
0.1u
TP202
C205
VMME
VDDMME
VDDRF2
VRF2
VRF3
VDDRF13_AFC
VRF1
U201 VVIB
VDDSIMVIB
VSIM
VAFC
VRTC
VDDUMTS
VUMTS
VDDSD1
SD1_FB
SD1_FBL
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4. TROUBLE SHOOTING
Revision A
PWRON
TP1
SG3_RPWRON_EN
RTC_OUT
2V8_VVIB
L202
1V35_CORE 2V7_VRF 2V85_VRF 1V5_VRF
10u
VBAT 1V5_VBT 2V11_RTC 2V9_SIM 2V65_VBT
C11
C10
D10
D11
E10
E11
F10
F11
G11
G10
H11
H10
H9
J11
FB202
K11
J10
L10
C244
C226
C236 C234 C227 C228 C242 C210 C203
1u 1u 1u 2.2u 2.2u 2.2u 2.2u
1u
10u
LGE Internal Use Only
LGE Property
R216
ON_OFF2
27K
2V9_VMME
1V8_SD
C229 C232 C233
2.2u 2.2u 2.2u