Samsung galaxy Grand i9082 GSM 850 RX 2G Network not working Solution

Samsung galaxy Grand i9082 GSM850 RX 2G Network not working Solution Schematic , Diagram , Circuit 

Samsung galaxy Grand i9082 GSM850 RX 2G Network not working Solution Step by Step 

Step 1

NORMAL CONDITION

catch the channel?

Step 2

Check L101 ≤ -65dBm ?

CHECK soldered

RFS100, L101,C153,L144,C152

Step 3

Check the Voltage at

C100 = VBAT_RF ?

Resolder or change

U101, C100

Step 4

Check C111

≥ -65dBm ?

Resolder or change

C111,L108

Step 5

Check component

soldering status OK at

F100

Resolder or change

F100

Step 6

Check F100 PIN 3,4

≥ -65dBm

Resolder or chan

F100

Step 7

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 8

Check the freq. at

OSC100

PIN1,3 : 26MHz ?

Change or resolder

OSC100

Step 9

GSM850 Receiver is O.K?

Resolder or change

UCP300

END

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