Thursday, September 3, 2015

Samsung galaxy S2 GT-I9100 WCDMA BAND5 TX 3G Network Not Working Solution

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Samsung galaxy S2 GT-I9100 WCDMA BAND5 TX 3G Network Not Working Solution  Schematic,Circuit,Diagram

Samsung galaxy S2 GT-I9100 WCDMA BAND5 TX 3G Network Not Working Solution Step By Step
Step 1
Check U101 PIN11 :
About 22 dBm ?

CHECK soldered
- RFS100,L107,C107,L108,

C106,C104,C105,ANT100

Step 2

Check the Voltage at
C102 = VBATT ?

Resolder or change
U101, C102

Step 3

Check C100, L100 :
About 22dBm ?

Resolder or change
C100, L100

Step 4

Check component
soldering status OK at
F100

Resolder or change
F100

Step 5

Check C128, C133
About 22dBm ?

Resolder or change
C128, C133

Step 6

Check the Voltage at
R741,C117=VOUT_CHARGER?

Resolder or change
PAM100, R741, C117

Step 7

Check C125, L112 :
About 0dBm ?

Resolder or change
C125, L112

Step 8

Check the voltage at
{C138 = VOUT_CHARGER ?}
& {C169, C170, C171
= VOUT_CHARGER?}
& {C137, C174 = 2.85V ?}
& {C134, C176 = 2.65V ?}
& {C136, C178 = 1.8V?}

& {C135, C175, C173 = 1.2V?}

Resolder or change

U104

Step 9

Check the freq. at C123
: 26MHz ?

Change or resolder
OSC100

Step 10

WCDMA band5 Transmitter is O.K?

Resolder or change
UCP300

Step 11

END











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