LG MG370 Service Manual page 82

7. CIRCUIT DIAGRAM
1 2 3
A
PRESENT RADIO
B
1
NC1
C301 100p 2
FM_ANT FMIP
3
RFGND
4
GND1
5
_FM_RST _RST
C
2V8_VRADIO
R306 R307
4.7K 4.7K
FM_SCL
FM_SDA
0.1u C308
32K_OUT
D
2V85_VIO VBAT
R308
NA
E
FM_RADIO_EN
C309
0.1u
ABSENT RADIO
F
R311 0
HS_MMI_R
HS_OUT
R312 0
HS_MMI_L
C
D
E
F
1 2 3
LG(42)-A-5505-10:01
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4 5 6 7
2V8_VRADIO
2V8_VRADIO
C300 R300 39K
1u
2V8_VRADIO U301 LM4809LD
7 8
VDD VOUT1
15
GND3
14 C302 220n R301 20K 1
U300 LOUT VIN1
13 6
ROUT VOUT2
C303 220n
SI4702-B16 1 2 R302 20K 5
GND2 VIN2
11
VD
2 3
BYPASS GND
4 9
C304 HS_AMP_EN _SHDN BGND
1u
R303 39K
2V8_VRADIO R305 C306 C305
100K 1u 0.1u
C307
1u
2V85_VIO
U303
NLAS5223BMNR2G
1 10
VCC NO2
2 9
HS_FM_R NO1 COM2
2V8_VRADIO
3 8
HS_MMI_R COM1 IN2
4 7
IN1 NC2
U302 BH28FB1WHFV
5 6
VIN VOUT HS_OUT NC1 GND
3 4
GND BGND
2 6
STBY NC HS_FM_SEL
1 5
C310 C311 R309
1u 0.1u 100K
4 5 6 7
8 9 10 11
HS_FM_L
HS_FM_R
HS_FM_L
HS_MMI_L
HS_OUT
R310
27K
(CURRENT MODE:30uA)
RADIO
NO RADIO
8 9
- 81 -
12 13 14 15
RADIO_DETECT
RADIO_DETECT
27K
2.7K
LGE Internal Use Only
16
A
B
C
D
E
F
C
D
E
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