Samsung galaxy S2 GT-I9100 GSM1800 RX 2G NETWORK Not Working Solution

Samsung galaxy S2 GT-I9100 GSM1800 RX 2G NETWORK Not Working Solution Schematic,Circuit,Diagram

Samsung galaxy S2 GT-I9100 GSM1800 RX 2G NETWORK Not Working Solution Step By Step

Step 1

NORMAL CONDITION

catch the channel?

Step 2

Check C107 ≤ -65dBm ?

CHECK soldered

RFS100, L107,C107,L108

Step 3

Check the Voltage at

C102 = VBATT ?

Resolder or change

U101, C102

Step 4

Check C101, L101

≥ -65dBm ?

Resolder or change

C101, L101

Step 5

Check component
soldering status OK at

F100

Resolder or change

F100

Step 6

Check F100 PIN 18, 19

≥ -65dBm

Resolder or change

F100

Step 7

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 8

Check the freq. at C123

: 26MHz ?

Change or resolder

OSC100

Step 9

GSM1800 Receiver is O.K?

Resolder or change

UCP300

Step 10

END

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