Samsung galaxy Grand i9082 WCDMA BAND 8 TX 3G Network not working Solution

Samsung galaxy Grand i9082 WCDMA BAND 8 TX 3G Network not working Solution Schematic , Diagram , Circuit

Samsung galaxy Grand i9082 WCDMA BAND 8 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 L105, L106 :

About 22dBm ?

Resolder or change

L105, L106

Step 4

Check component

soldering status OK at

DUF100

Resolder or change

DUF100

Step 5

Check L104, C108, C109 :

About 22dBm ?

Resolder or change

L104, C108, C109

Step 6

Check the Voltage at

C104=VOUT_CHARGER?

Resolder or change

U100, C104

Step 7

Check C148 : About

0dBm ?

Resolder or change

C148

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 band8 Transmitter is O.K?

Resolder or change

UCP300

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