Samsung galaxy S2 GT-I9100 WCDMA BAND8 TX 3G Network Not Working Solution

Samsung galaxy S2 GT-I9100 WCDMA BAND8 TX 3G Network Not Working Solution Schematic,Circuit,Diagram

Samsung galaxy S2 GT-I9100 WCDMA BAND8 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 L104, L105 :
About 22dBm ?

Resolder or change
L104, L105

Step 4

Check component
soldering status OK at
F100

Resolder or change
F100

Step 5

Check C129, C130 :
About 22dBm ?

Resolder or change
C129, C130

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 band8 Transmitter is O.K?

Resolder or change
UCP300

Step 11

END

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