Samsung galaxy Grand i9082 WCDMA BAND2 TX 3G Network not working Solution

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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