Friday, August 21, 2015

Samsung galaxy Grand i9082 WCDMA BAND1 TX 3G Network not working Solution

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Samsung galaxy Grand i9082WCDMA BAND1 TX 3G Network not working Solution Schematic , Diagram, Circuit




Samsung galaxy Grand i9082WCDMA BAND1 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, C100

Step 3


Check L147, L109 :
About 22dBm ?

Resolder or change
L147, L109

Step 4


Check component
soldering status OK at
DUF101

Resolder or change
DUF101

Step 5


Check L113, L114, C118 :
About 22dBm ?

Resolder or change
L113, L114, C118

Step 6


Check the Voltage at
C104=VOUT_CHARGER?

Check C149 :
About 0dBm ?

Step 7


Resolder or change
C149

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 band1 Transmitter is O.K?

Resolder or change
UCP300





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