LG GT500 - Page 117

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.13.3 GPS RF path
start
1. Check GPS Antenna pad
contact
1
2. Change the LNA (U750)
Change the sub PCB
1
1
2
3
3. Change GPS IC (U751)
2
3
GPS LNA block
100p
C772
C771
0.1u
ALM-1612
FIL_OUT
43
GND
RF_IN
2
1
S_D
VDD
5
2.2u
U770
C770
C757NA
L750 6.8nH
VDDE_1V8
VGPS_1V8
2.2nH
L770
10nH
L771
0R772
F1
TESTMODE
V
DDIFSYNTH
D1
F6
_
LPREGOUT
VDDRF
D2
VPD
D5
RFIN
B1
E2
RFREGOUT
E1
R
FSREGOUT
C7552.2nH
100nH C758
100nH
L772
0
R750
1
CN750
1
CN751
C760
1u
C752
1u
C756 0.5p
1u
C759
10
R770
ACC_GP_GPS_PON
3
2
1