Thursday, September 3, 2015

Samsung galaxy S2 GT-I9100 WCDMA Band5 GSM 850 RX Network Not Working Solution

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Samsung galaxy S2 GT-I9100 WCDMA Band5 GSM 850 RX Not Working Solution Schemtic,Circuit,Diagram

Samsung galaxy S2 GT-I9100 WCDMA Band5 GSM 850 RX 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 C100, L100

≥ -65dBm ?

Resolder or change

C100, L100

step 5

Check component
soldering status OK at

F100

Resolder or change

F100

Step 6

Check F100 PIN 20, 21

≥ -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 band5/GSM850

Receiver is O.K?

Resolder or change

UCP300

Step 10

END
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