Thursday, August 20, 2015

Samsung galaxy S4 I9500 GSM850/GSM900 TX Network Not Working Solution

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Samsung galaxy S4 I9500  GSM850/GSM900 TX 3G Network Not Working Solution Schematic,Circuit,Diagram

Samsung galaxy S4 I9500  GSM850/GSM900 TX 3G Network Not Working Solution Step By Step

Step 1
F100 PIN 4 :
About 30dBm ?

CHECK soldered
- RFS100, L111, C136

Step 2

Check F100 PIN 6
About 30dBm

Resolder or change
F100

Step3

Check the Voltage at
C166 = VBATT ?

Resolder or change
C166, L119

Step 4

Check component
soldering status OK at
F101

Resolder or change
F101

Step 5 

Check F101 PIN 9
About 30dBm ?

Resolder or change
F101

Step 6

Check U102 PIN 4
About 30dBm ?

Resolder or change
L117, C153

Step 7

Check U102 PIN 26
About 10dBm?

Resolder or change
U102

Step 8

Check the freq. at
OSC100 PIN 4 : 26MHz ?

Change or resolder
OSC100

Step 9

Check component
soldering status ok at
U103

Resolder or change
U103

Step 10

GSM850/900 Transmitter is O.K?

Resolder or change
U300

Step 11

END


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