Samsung galaxy S2 GT-I9100 WCDMA Band1 RX 3G Network Not Working Solution

Samsung galaxy S2 GT-I9100 WCDMA Band1 RX 3G Network Not Working Solution Schematic,Circuit,Diagram

Samsung galaxy S2 GT-I9100 WCDMA Band1 RX 3G 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 C108, L102

≥ -65dBm ?

Resolder or change

C108, L102

Step 5

Check component

soldering status OK at

F100

Resolder or change

F100

Step 6

Check F100 PIN 14, 15

≥ -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 band1 Receiver is O.K?

Resolder or change

UCP300

Step 10

END

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