Samsung galaxy S2 GT-I9100 WCDMA Band2 / GSM1900 RX Network Not Working Solution

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Samsung galaxy S2 GT-I9100  WCDMA Band2 / GSM1900 RX Network Not Working Solution Schematic,Circuit,Diagram

Samsung galaxy S2 GT-I9100  WCDMA Band2 / GSM1900 RX 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 L103, L106
≥ -65dBm ?

Resolder or change
L103, L106

Step 5

Check component
soldering status OK at

F100

Resolder or change

F100

Step 6

Check F100 PIN 16, 17

≥ -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

WCDMA band2/GSM1900

Receiver is O.K?

Resolder or change

UCP300

Step10

END

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