Power On Trouble - LG -T370 Service Manual

RF SUPPLIES (CLEAN GND)
VDDTRX VDDRF2
PIN_B16 PIN_G15
TP7
TP5
C208 C209 C210
1u 18p 220n
ABB SUPPLIES
VBATSP
VDD1V8CP
Speaker Supply
VDD_IO_1V8
PIN P16
C201
0.1u
VDD_IO_1V8
L201
3.3u
VDD_IO_1V8
22u
C221
VBAT
VDD_IO_1V8
VBAT
C222 10u
LGE Internal Use Only
RF SUPPLIES (DIRTY GND)
VBAT
VBAT_RF2 VDDXO
PIN_G16 PIN_E13
FB201
75
TP9
C211
C218 C219
4.7n
1u 470n
(10V)
PMU SUPPLIES
VBAT_PMU
VBAT VPMU VPA_2V85
PIN N10 PIN P12 PIN P10
TP2
TP4
C202 C203 C204
2.2u 0.1u 470n
(10V)
VDD_IO_1V8
VPMU
RF_TX_RAMP
VDD_IO_1V8
VDD_IO_1V8 VCORE VCORE VDD_IO_1V8
Figure 4.2 power block of T370
VDDTDC VDDMS VRF1
PIN_B14 PIN_H15 PIN_H12
Seperate and shield
TP8
TP10 TP6
C212 C213 C214
47n 47n 1u
VMMC_2V85 VUSB VCORE
PIN L9 PIN M11 PIN K10
TP1 TP3
C205 C206 C207
470n 0.1u 220n
VBAT_RF2 VPA_2V85
VDDMS VDDXO VDDTDC VMMC_2V85 VUSB VDDRF2
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4. TROUBLE SHOOTING
DBB SUPPLIES
VDD_IO_1V8
VDD_IO1 VDD_IO2
VDD_IO_1V8 VDD_IO_1V8
PIN G11 PIN K9
C215 C216
1u 0.1u
VBACKUP_BAT
C220
1u R202
470 R203
3.9K
3
2
Q201
VBAT
1
VRF1
R205
5.6K
R5
A_D0
N5
A_D1
N3
A_D2
Only for training and service purposes
VDD_EBU
VDD_IO_1V8
PIN F6,P6
C217
0.1u
R204
VUSB_LDO_4V9
100K
(1%)
NANDD_DDRA[00]
NANDD_DDRA[01]
NANDD_DDRA[02]