LG KM710 Service Manual - Page 91

FM-Radio Trouble Shooting

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4. Trouble Shooting 4.17 FM-Radio Trouble Shooting START Check the VRABB Voltage(2.8V) O.K? NO Go to the Power Trouble shooting Check the soldering status Of C306,L302(Main). O.K? YES Check the signal of C201,C202 Can you see a signal? YES Go to the speaker/ EAR_MIC Trouble shooting NO Replace C306,L302(Main) NO Check 32.768kHz signal at C213,C212 Can you see a signal? YES FM IC is problem. Replace the U200 NO The CLK Buffer is problem. Replace the U201,R480 FM_INT FM RADIO + RDS VRIO R200 4.7K VRABB VA GPIO3 16 GPIO2 17 19 18 NC2 GPIO1 PGND 20 21 FM_ANT C200 100p 6 7 8 _SEN SCLK 9 SDIO 10 RCLK VIO 1 NC1 GND3 15 2 3 4 FMIP RFGND 1 LOUT ROUT 14 13 2 5 GND1 U200 GND2 11 _RST SI4703-C19-GM VD VRIO C201 C202 0.1u 0.1u C204 2.2u R201 10K C211 0.1u RADIO_L RADIO_R C212 0.1u C214 27p R202 47K C213 0.1u CLK_32K FM_RESET I2C_SCL I2C_SDA LGE Internal Use Only - 92 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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- 92 -
4. Trouble Shooting
4.17 FM-Radio Trouble Shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
FM IC is problem.
Replace t
he U200
YE
S
NO
Check the soldering status Of
C306,L302(Main).
O.K?
Check the signal of C201,C202
Can you see
a signal
?
START
YES
Go to the speaker/
EAR_MIC Trouble
shooting
N
O
Check 32.768kHz signal
at C213,C212
Can you see a signal
?
Check the VRABB Voltage(2.8V)
O.
K?
NO
YE
S
N
O
Replace C306,L302(Main)
Go to the Power Trouble
shooting
The CLK Buffer is
problem.
Replace the
U201,R480
FM RADIO + RDS
100p
C200
VRIO
C201
0.1u
C202
0.1u
C214
27p
47K
R202
VRABB
0.1u
C211
VRIO
10K
R201
3
ROUT
13
7
SCLK
SDIO
8
VA
16
VD
11
10
VIO
_RST
5
_SEN
6
SI4703-C19-GM
U200
FMIP
2
GND1
4
1
2
GND2
15
GND3
19
GPIO1
GPIO2
18
17
GPIO3
LOUT
14
1
NC1
NC2
20
21
PGND
RCLK
9
RFGND
C204
2.2u
0.1u
C213
0.1u
C212
4.7K
R200
RADIO_R
CLK_32K
FM_RESET
RADIO_L
FM_INT
I2C_SCL
I2C_SDA
FM_ANT