Samsung galaxy S4 I9500 DCS/PCS TX 3G Network Not Working Solution

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

Samsung galaxy S4 I9500 DCS/PCS 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

Step 3

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 10
About 30dBm ?

Resolder or change

F101

Step 6

Check U102 PIN 9
About 30dBm ?

Resolder or change
C154, L118

Step 7

Check U102 PIN 24
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

DCS/PCS Transmitter is O.K?

Resolder or change
U300

Step 11

END

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