Fm Radio Trouble - LG KE600 - Cell Phone Service Manual

5.14 FM Radio trouble

Check Points
-Ear_mic_set is correctly operated as FM radio antenna
(When user uses the FM radio function, Ear_mic_set must be connected in phone)
-A condition of FM_Radio module soldering
-FM_Radio signal is flowed correctly
-Power and clock signals are supplied in U303
CLK32K
Checking Points
R337
1
GND1
2
FMIP
3
RF_GND
4
FMIN
5
GND2
6
GND3
2V72_IO
R336
10K
2V72_IO
FM_RESETn
SCL
U305
VCC SDA
R337 0
A Y
GND
C338
MC74VHC1GT50DFT2
0.1u
-> MC74VHC1GT50DF1G
Figure 30 Bluetooth circuit
D308
L303
C332
C326
U303
Figure 20. FM_Radio Part
- 101 -
5. Trouble shooting
D308
C326
C368
L303
PG05DBTFC
100nH NA
24p
2V85_IO2 VBAT
18
VA
17
GND5
16
U303 LOUT FM_L
15
SI4701 ROUT FM_R
14
GND4
13
VD
C335 C336
4.7u 22n
2V72_IO
C337
220n
C328
C337
U305
CN302