Samsung galaxy Grand i9082 GSM850/GSM900 TX 2G Network not working Solution

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Samsung galaxy Grand i9082  GSM850/GSM900 TX 2G Network not working Solution Schematic , Diagram, Circuit

Samsung galaxy Grand i9082  GSM850/GSM900 TX 2G Network not working Solution Step by Step

Step 1

U101 PIN13 : About

30dBm ?

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 L146

: About 0dBm ?

Resolder or change

L146

Step4

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 5

Check the freq. at

OSC100

PIN1,3 : 26MHz ?

Change or resolder

OSC100

Step 6

GSM850/900 Transmitter is O.K?

Resolder or change

UCP300

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