LG MG810c Service Manual page 89

7. CIRCUIT DIAGRAM
1 2
ANT401 ANT402
C402
A
NA
R406
10p
L401
6.8nH
SW401
KMS-512
B
RF2.85V
0603
FL401
C416
DGM081
1000p
11 1
VDD GSM850_RX1
2
GSM850_RX2
15 3
CTRL1 GSM900_RX1
14 4
CTRL2 GSM900_RX2
5
GSM1800_RX1
9 6
GND1 GSM1800_RX2
13 7
GND2 GSM1900_RX1
16 8
GND3 GSM1900_RX2
18
GND4
19
GND5
C
20 12
GND6 GSM850_900_TX
10
GSM1800_1900_TX
0603
R423 220
ANT_SW2
0603
R424 220
ANT_SW1
CTRL1 CTRL2
PIN 18 PIN 21
D
GSM850_EGSM RX L L
GSM850_EGSM TX L H
DCS/PCS RX H L
DCS/PCS TX H H
RF2.85V
R426
R427
22K
270K
22K Thermistor
R428
E 680
TEMPSENSE
R429
4.7K
1 2
LGIC(42)-A-5505-10:01
3 4
ANT403
GSM_TX
DCS_PCS_TX
L402
27nH
L403
27nH
Coil Type
C418
1.2p
L404
6.8nH
C421
1.2p
C424
1.2p
L405
5.6nH
C427
1.2p
GSM_TX
DCS_PCS_TX
Iss.
3 4 5
5 6 7 8
R404
GSM_OUT GSM_IN
8 7
35dBm
10p
VRAMP
C403 6
C404
GND23
22nH
32
NA
GND22 GND
31 5
GND21 RF3166
30
GND20 U401 VBATT
29 4
GND19
28
GND18 TX_ENABLE
27 3
GND17
26
BAND_SELECT
2
R409
DCS_PCS_OUT DCS_PCS_IN
9 1
33dBm
1.8nH
C406 C407
1p 1.2p
C408
33u
RF2.85V
C411
0.1u
C413 C414 C415
27p 27p 27p
0603 0603 0603
24 1 R414 220
RFIAN SCLK
23 2 R415 220
RFIAP _SEN
22 3 R416 220
RFIEN SDIO
21 4
RFIEP U402 BQN
20 5
RFIDN SI4210D BQP
19 6
RFIDP BIN
18 7
RFIPN BIP
17 8
RFIPP XOUT
C420
100p
RFOH
RFOL
C422
100p
R421
C425 C426
0.1u 0.1u 680
RF2.85V V_IO
RF2.85V RF2.85V
R550
100K
C428 C999
X401 26MHz 1000p 1000p
R425
1 3
AFC VCONT OUT
15K
2 4
GND VCC
C431 C430 C429
1000p 1u 1000p
Section Date
Designer
Checked
Approved
Notice No. Date Name LG Electronics Inc.
- 88 -
9 10
VBAT
4dB Atten
RFOL
R401 R402 R403
220 24 220
A
R405 220 0603
A
APC
C405
27p
0603
R407 220 0603
PA_ON
R408 220 0603
PA_BAND
3dB Atten
RFOH
R410 R411 R412
300 18 300
C517 C518
NA NA
B
B
TCXO_OUT
0603
SCLK
0603
SENB
0603
SDI
RXQN
RXQP
RXIN
RXIP
R417
TXQN
820
C419
390p
R418 C
TXQP
820
R419
TXIN
820
C423
390p
R420
TXIP
820
26MHz
R422 0
PDNB
0603
D
BT_26MHZ
TCXO_OUT
Sign & Name Sheet/
MG810c
MODEL Sheets
4/5
S.J.Kwon
C.B.Hong
DRAWING
RF
NAME
DRAWING
Rev 1.0
NO.
LG Electronics Inc.