LG GS290 Service Manual page 32

4. TROUBLE SHOOTING
PMIC
VUSB VBAT
FM_SPK_OUTP
VBAT FM_SPK_OUTN
VPLL_1V35 VIO_2V62 VBAT
C236 C238
VBAT
1u 2.2u
FM_SPK_INN
FM_SPK_INP
USB_OEN
USB_DAT_VP
USB_SE0_VM
TXON_PA
SD_1V8 VAUDB_2V5 VBAT
VBAT
VAUDA_2V5 VFM_2V9
B1
RCV
C2
VPIN
D3
VMIN
C1
USB_DP
D+
D2
USB_DM D-
E3
PMRSTN
RESET_N
D1
RESET2_N
E2
VCXO_EN SLEEP1_N
E1
BT_CLK_REQ SLEEP2_N
F2
VAUDIOA
F1 U202
VDDAUDIOA
PMB6821
G2
VDDAUDIOB
G1
VAUDIOB
H2
VAUX
H1
VDDAUX
C207 C205 C200
1u 1u 1u J1
SU1_GATE
J2
SU1_GND
H3
SU1_FB
J3
SU1_ISENSE
K1
VDDSD2
K2
SD2_FB
L2
SD2_FBL
C204
0.1u
C234 C239 C222 C209 C227 C226
22u 2.2u 2.2u 0.1u 2.2u
10u
LDO Net name Output Voltage
SD1 CORE_1V35 1.35V
SD2 SD_1V8 1.8V
VAUX VFM_2V9 2.9V
VIO VIO_2V62 2.62V
VSIM VSIM_2V9 2.9V
VMME VMME_2V9 2.9V
VUMTS CAM_2V85 2.85V
VUSB VUSB 3.1V
VLED VLED 2.9V
VAUDIOa VAUDA_2V5 2.5V
VAUDIOb VAUDB_2V5 2.5V
VRF1 VRF_2V85 2.85V
VRF2 VRF_1V5 1,53V
VRF3 VBT_2V65 2.7V
VPLL VPLL_1V35 1.35V
VRTC VRTC_2V11 2.11V
VAFC VAFC 2.65V
VVIB CAM_A_2V8 2.8V
LGE Internal Use Only - 64 -
R214
RTC_OUT ON_OFF2
27K
VBAT VBAT
RPWRON_EN
C241
1u
C214
0.1u
CORE_1V35 CAM_A_2V8 VSIM_2V9 VBT_2V65 SD_1V8
L201 VBAT CAM_2V85 RTC_2V11 VRF_2V85 VRF_1V5 VMME_2V9
10u
C11
VMME
C10
VDDMME
D10
VDDRF2
D11
VRF2
E10
VRF3
E11
VDDRF13_AFC
F10
VRF1
F11
VVIB
G11
VDDSIMVIB
G10
VSIM
H11
VAFC
H10
VRTC
H9
VDDUMTS
J11
VUMTS
FB201
K11
VDDSD1
J10
SD1_FB
L10
SD1_FBL
C208 C240 C223 C237 C219 C230 C229 C228 C231 C202 C235
2.2u 1u 1u 1u 1u 2.2u 1u 2.2u 2.2u 1u
10u
Output Current Usage
600mA Core & for LDO
300mA Memory
100mA Touch, LCD
100mA Peripherals
70mA SIM card
150mA u-SD
110mA Camera
40mA USB
10mA Not used
200mA Stereo headset, Mono earpiece
50mA Analog parts of S-Gold
2.85 V supply for SMARTi-PM
150mA
RF transceiver
1.5 V supply for SMARTi-PM
100mA
RF transceiver
150mA BT/FM Radio
30mA S-GOLD3 PLL
4mA Real Time Clock
5mA Not used
140mA Camera
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START
No
Change Battery or
Battery Voltage,
Check Battery
higher than 3.35V ?
connector
Yes
Check the RPWRON,
"PWRON" signal
No
Check 3 pin of Q201
Yes
"_RESET" signal
No
Check 8 pin of U203
U203 or replace it
Yes
Check the all LDO's
No
U202 or replace it
output
Is it correct?
Yes
Check solder X500
Is the 26MHz
No
clock From X500
Check 1 pin of X500
signal correct?
Or Check 11 pin of
Yes
Replace main PCB
Change Battery Connector
1. Don't use Heat Gun
2. Replace main PCB
Copyright © 2010 LG Electronics. Inc. All right reserved. - 65 -
Only for training and service purposes
4. TROUBLE SHOOTING
TP1
Q201
replace Q201
TP2
Check solder
U203
U202
Check solder
11pin of U500
X500
or replace it
U500
U500
1pin of X500
LGE Internal Use Only