Samsung galaxy Not 2 GT-N7100 WCDMA BAND1 TX 3G Network Not Working Solution

Samsung galaxy Not 2 GT-N7100 WCDMA BAND1 TX 3G Network Not Working SolutionSchematic,Circuit,Diagram

Samsung galaxy Not 2 GT-N7100 WCDMA BAND1 TX 3G Network Not Working Step byStep

Step  1

U100 PIN11 : About

30dBm ?

CHECK soldered
- RFS100,C103, L102

C107,L100,ANT100

Step 2

Check the Voltage at

C101 = VDD_2V85_SUE2 ?

Resolder or change

U100, C101

Step 3

Check L104 :

About 22dBm ?

Resolder or change

L104

Step 4

Check component
soldering status OK at

F100

Resolder or change

F100

Step 5

Check C140,L136 :

About 22dBm ?

Resolder or change

C140,L136

Step 6

Check the Voltage at

R105,C134=VOUT_CHARGER?

Resolder or change

U103, R105,C134

Step 7

Check C138, C121

About 0dBm ?

Resolder or change

C138, C121

Step 8

Check the voltage at
{C150 = VOUT_CHARGER ?}
& {C165, C166, C167 =
VOUT_CHARGER?}
& {C149, C174 = 2.85V ?}
& {C144, C172 = 2.65V ?}
& {C148, C177 = 1.8V?}

& {C147, C175, C173 = 1.2V?}

Resolder or change

U104

Step 9

Check the freq. at

OSC100 PIN 1,3: 26MHz ?

Change or resolder

OSC100

Step  10

WCDMA BAND1 Transmitter is O.K?

Resolder or change

UCP300

Step11

END

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