4. TROUBLE SHOOTING
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Only for training and service purposes
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4.8.2 Checking GPS LDO
System Setting -> Location Service -> GPS satellites Check -> Enter test mode *#*#880#*#* -> GPS Test ->
Positioning Test -> Setting Key ‘Start GPS’
If Setting is right, mobile should display and blink GPS icon
Positioning Test
Setting Key ‘Start GPS’
If your setting is right, mobile should display and blink GPS icon
Test Point
U12001
VCC_GPS_1V8
Check
Flow
GPS LDO OK?
Replace U12001
F/W update
GPS TCXO
Circuit
VCC_GPS_1V8
1.8V
U12001
VCC_GPS_1V8
1.75V> VCC_GPS_1V8 >1.83V
5.1 Circuit Power ON trouble Shooting
TP2(GPS LDO) OK?
Replace U12001
F/W update
TP2(U12001 VCC_GPS_1V8)
10n
C1030
26MHz
1XXA26000FBA
X1000
3
2
4
1
VCONT
VCC
GND
OUT
22n
C1029
TP2 U12001
VCC_GPS_1V8