Samsung galaxy S2 GT-I9100 GSM850 GSM900 TX 2G Network Not Working Solution

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Samsung galaxy S2 GT-I9100 GSM850/GSM900 TX 2G Network Not Working Solution Schematic,Circuit Diagram

Samsung galaxy S2 GT-I9100 GSM850/GSM900 TX 2G Network Not Working Solution Step by Step 

Step 1

U101 PIN11 : About

30dBm ?

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 C120, L110, L113
: About 30dBm ?

Resolder or change
C120, L110, L113

Step 4

Check the Voltage at
R741,C117=VOUT_CHARGER?

Resolder or change

PAM100, R741, C117Step 5Check C125, L112 :

About 0dBm ?
Resolder or change
C125, L112

Step 6

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 7

Check the freq. at C123
: 26MHz ?

Change or resolder
OSC100

Step 8

GSM850/900 Transmitter is O.K?

Resolder or change
UCP300

Step 9

END

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