Samsung galaxy Grand i9082 WCDMA BAND2 TX 3G Network not working Solution Schematic , Diagram, Circuit
Samsung galaxy Grand i9082 WCDMA BAND2 TX 3G Network not working Solution Step By Step
Step 1
Check U101 PIN13 :
About 22 dBm ?
CHECK soldered
RFS100, C152, C153, L100,
L101, L144, ANT100
Step 2
Check the Voltage at
C100 = VBAT_RF ?
Resolder or change
U101, C10
Step 3
Check L116 :
About 22dBm ?
Resolder or change
L116
Step 4
Check component
soldering status OK at
DUF102
Resolder or change
DUF102
Step 5
Check L120, L121, C123 :
About 22dBm ?
Resolder or change
L120, L121, C123
Step 6
Check the Voltage at
C120=VOUT_CHARGER?
Resolder or change
U102, C120
Step 7
Check C150
About 0dBm ?
Resolder or change
C150
Step 8
Check the voltage at
{C139,C138 =
VOUT_CHARGER ?}
& {L402
= VOUT_CHARGER?}
& {C136, C137,C453 = 2.7V ?}
& {C142, C143,C453 = 2.7V ?}
Resolder or change
U104
Step 9
Check the freq. at
OSC100
PIN1,3 : 26MHz ?
Change or resolder
OSC100
Step 10
WCDMA band2 Transmitter is O.K?
Resolder or change
UCP300
END
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