LG -T300 Service Manual page 127

7. CIRCUIT DIAGRAM
16 15 14
L
K
RF PART
GND401 GND402
ANT401
J
C408 R403
C403
DNI 2.7n
1n
SW401
I
C404 7p
C401
C407
5.6n
1p
H
G
F
TX_EN BS3
MODE
(TX_ENABLE) (GPCTRL2)
LOW POWER MODE LOW LOW
RX1(EGSM_RX) LOW HIGH
RX2(GSM850_RX) LOW LOW
RX3(PCS_RX) LOW LOW
E
RX4(DCS_RX) LOW LOW
GSM850/900_TX HIGH LOW
DCS/PCS_TX HIGH LOW
D
FM_LNA_EN
C
FM_ANT_1
B
A
16 15 14
LGE Internal Use Only
13 12 11 10
R401 1K
TX_RAMP
TX_EN
BS1
VBAT
BS2
BS3
C421 C413 C424 C423 C426
1n 1n 1n 1n 39p
C425 C419
10n 33p
17 1
GPCTRL2 GND1
16 2
GND9 GND2
C409 56p
15 U401 3
GND8 RFIN_LB
14 4
L404
ANT GND3 C410 22p
13 5
DCS
RX4 RFIN_HB
12 6
C442 PCS
C405 RX3 GND4
1.2p DNI
GSM850
EGSM
FL402 C411 1.8n
C416 33p DCS
1 8
IN_1842_5 OUT_1842_5
L402 L408
C417 33p PCS 1.8n
4 9
IN_1960 OUT_1960 68n
2 7
GND1 GND2
3 6 1.8n
C420
GND3 GND4
5 10
GND5 GND6
1805M1880M,1930M1990M
L409 22p
FL401
GSM850
C418 33p
1 8
IN_881_5 OUT_881_5
L407
C427 33p EGSM 12n 33n
4 9 L410
IN_942_5 OUT_942_5
2 7
GND1 GND2
3 6
GND3 GND4 L406 22p
5 10
GND5 GND6
869M894M,925M960MHz
BS2 BS1
(GPCTRL1) (GPCTRL0)
LOW LOW
LOW LOW
HIGH LOW
HIGH HIGH
LOW HIGH
HIGH LOW
HIGH HIGH
L413
22n
C445 FM Radio(LNA)
1u
R406
5.1ohms
R407 R408
24K 270ohms
C446
R410 C448
3 FM_ANT
1 Q401
470n
30
470n 2
C447
R409
4.7K
470n
13 12 11 10
9 8 7 6
BLUETOOTH
C412 C415
4.7u 4.7u
GSM_OUT
3.3n L403 3.3n
DCS_PCS_OUT
L405
1.5n
C422
1p
AMAN301512ST01
C444
FL403
FEED C437 750f
1 3
GND2 GND1 OUT
3 2 4
1.5n GND2
RX34X
ANT403
1n C429 C430
DNI DNI
C443
RX34
DBB_BT_INT
RX12X
BT_DBB_INT
FSYS_EN
RX12
9 8 7 6
- 128 -
5 4 3 2
VAUX 1V8_VDD
C436 10n FB401 600
C428 1u
C434 10p
C433
C432
10n
2.2u
C435 10n
C439
C438
1u
10p
C431
D6 1V8_VDD
R402 15K 1n
RES
1 C7 C5
IN RFP RST_N BT_RESET
2 B5
GND1 REG_EN
E1
SCL
2450MHz D1 C6
SDA TM2
C1 D4
SPIM_CLK PCM_IN
E2 E4
SPIM_CS_N PCM_OUT
C4
U402 PCM_CLK
C441 1n B4 A4
CLK32K LPO_IN PCM_SYNC
C440 1n F5 C2
BT_CLK XIN UART_TXD
E5 D2 TP401
XOUT UART_RXD
F2
TP402
UART_RTS_N
C3 E3
TP403
GPIO_0 UART_CTS_N
D5 TP404
TP405 GPIO_6
B3 B2
GPIO_1 HUSB_DN
F4 A2
TP406 GPIO_5 HUSB_DP
5 4 3 2
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1
L
K
J
I
H
PCM_TX
PCM_RX
PCM_CLK
PCM_SYNC
BT_RXD
BT_TXD
BT_CTS G
BT_RTS
F
E
D
C
B
A
1