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

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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