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

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

Unofficial Support Site By welcome Zone Haldwani 

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