LG TracFone LG840G Service Manual page 132

SMPS Circuit
L301
VREG_MSMC_1.2V
C301
10u
L302
VREG_RF1_2.3V
C305
10u
L303
VREG_RF2_1.4V
C308
10u
LDO Supply
VREG_RFRX2_1.3V
L305
L306
L307 39n
LDO Supply VREG_RFTX2_1.3V
FB301 220
LDO Supply
VREG_RFA_2.2V
VCOIN
VCHG_DET
C331 C332
4.7u 4.7u
OJ301 OJ302 OJ303
LGE Internal Use Only
4.7u
VSW_MSMC AC18
4.7u
VSW_RF1 AC15
VREG_RF1_2.3V|VREG_RF1
4.7u
VSW_RF2 AC17
VREG_RF2_1.4V|VREG_RF2
DCS/PCS_RX_M
DCS/PCS_RX_P
GSM900_RX_M
GSM900_RX_P
W1900_RX_M
W1900_RX_P
W850/GSM850_RX_M
W850/GSM850_RX_P
W1900_TX_OUT
W850_TX_OUT
GSM_HB_TX
GSM_LB_TX
PWR_DET
GSM_PA_RAMP
C324 0.1u
L304 27n
27n
15n
+VPWR
0.2mm
C351
33u
Tx Rx
Tx PLL & QSC Rx PLL & QSC
R303
VREG_RFA_2.2V
100K
C303
0.1u
X301
FC-135_32.768KA-AC3
1 2
C306 C307
DNI DNI
32.768KHz
F23
PMIC control
RX_IN_G_HBM
G23
RX_IN_G_HBP
H22
RX_IN_G_LBM
J22
RX_IN_G_LBP
H23
RX_IN_U_G_HB1M
J23
RX_IN_U_G_HB1P
K23
RX_IN_U_HB2M
L23
RX_IN_U_HB2P
K22
RX_IN_U_G_LBM
L22
RX_IN_U_G_LBP
Digital POWER
A21
TX_OUT_U_HB1
A20
TX_OUT_U_HB2
A19
TX_OUT_U_LB
A22
TX_OUT_G_HB
B23
TX_OUT_G_LB
U201
C23
PWR_DET_IN
A18
PA_DAC
QSC6270-E
B18
TX_DAC_REF_BYP
K19
VDD_RFRX1
G21
VDD_RFRX2
K21
VDD_RFRX3 EUSY0369203
G19
VDD_RFRX4
J19
VDD_RFRX5
K18
VDD_RFRX6
H19
VDD_RFRX7
D22
VDD_RFTX1
D23
VDD_RFTX2
E18
VDD_RFTX3
C19
VDD_RFTX4
D21
VDD_RFTX5
C18
VDD_RFTX6 VDD_SPKR
- High Audio Power : VREG_5V
- Normal Audio Power : +VPWR
H18
VDD_RFA1
C20
VDD_RFA2
N18
VDD_RFA3
T18
VDD_RFA4
R23
PMIC POWER
VDD_RFA5
M18
VREG_CDC2
R19
HPH_VNEG
AA18
VCOIN
AB7
USB_VBUS
AA14
VCHG1
AB14
VCHG2
AA13
VPH_PWR1
AB13
VPH_PWR2
W12
BAT_FET_N
AB12
VBAT
- 132 -
XO_ADC_IN
C304
1n
1%
V15 C311 1u
VREG_USB_2P6
V14 C312 1u
VREG_USB_3P3
V13
C313 0.1u
VDD_EFUSE
A12
VREG_MSME_1.8V
VDD_P5
A6
VDD_P2_1
A9
VDD_P2_2
G3
VDD_P1_1
J3
VDD_P1_2
L3
VDD_P1_3
N3
VDD_P1_4
R3
VDD_P1_5
A15
VDD_P6
A1
VDD_CORE1
B2
VDD_CORE2
C3 C323
VDD_CORE3
K10
VDD_CORE4
0.1u
K11
VDD_CORE5
K12
VDD_CORE6
K13
VDD_CORE7
L10
VDD_CORE8
L11
VDD_CORE9
L12
VDD_CORE10
L13 (1) GROUP A1,B2,C3
VDD_CORE11
U1
(2) GROUP U1,U2
VDD_CORE12
U2
(3) GROUP K10,K11,K12,K13
VDD_CORE13
C329 0.1u
(4) GROUP L10,L11,L12,L13
T13 C330 2.2u
VREG_MPLL
V16
VDD_USB
AC14
VDD_RF1
AA17
VDD_RX2_TX2
AA16
VDD_PLL_CDC
AA20
VDD_NCP
AC16
VDD_RF2
AC21
VDD_SPKR
U21
VDD_TCXO
AA12
VDD_PAD_SIM
AA15
VDD_EBI_RFA
AA19
VDD_MSMC
AC15
VSW_RF1
VSW_RF1
AB15
VREG_RF1_2.3V|VREG_RF1
VREG_RF1
AC17
VSW_RF2 VSW_RF2
AB17
VREG_RF2 VREG_RF2_1.4V|VREG_RF2
AC18
VSW_MSMC
VSW_MSMC
SMPS
W16
VREG_RFA
AB18
NCP_CTC1
AB19
NCP_CTC2
AC20
VREG_NCP
AC12
VSW_5V
AC11
VREG_5V
W21
VREG_RFRX2
V21
VREG_RFTX2
W13
VREG_MSMP
AA22
VREG_GP1
W15
VREG_MSME
U22
VREG_TCXO
Y22
VREG_GP2
W14
VREG_USIM
LDO Bypass VPWR Bypass
7. CIRCUIT DIAGRAM
Backup Battery
VCOIN
R305
4.7K
C314
BAT301
2.2u
LDO Supply
LDO Supply
VREG_MSMP_2.6V
SMPS Supply
VREG_MSMC_1.2V
+VPWR
SMPS Supply
VREG_RF2_1.4V
SMPS Supply
VREG_RF1_2.3V
VREG_RFA_2.2V
VREG_RFRX2_1.3V
VREG_RFTX2_1.3V
VREG_MSMP_2.6V
VREG_LCD_2.8V
VREG_MSME_1.8V
VREG_TCXO_2.85V
VREG_MICROSD_3.0V
VREG_USIM_3.0V
LDO Outputs
SMPS Bypass
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Only for training and service purposes