Samsung galaxy S4 I9500 WCDMA BAND5 TX 3G Network Not Working Solution

Samsung galaxy S4 I9500 WCDMA BAND5 TX 3G Network Not Working Solution Schematic,Diagram,Circuit

Samsung galaxy S4 I9500 WCDMA BAND5 TX 3G Network Not Working Solution Step By Step

Step 1

F100 PIN 4 :

About 22dBm ?

CHECK soldered

- RFS100, L111, C136

Step 2

Check F100 PIN 6

About 22dBm

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

NO Resolder or change

F101

Step 5

Check F101 PIN 35

About 22dBm ?

Resolder or change

F101

Step 6

Resolder or change

C142

Check U102 PIN 36

About 22dBm ?

Step 7

Resolder or change

U102

Check U102 PIN 26

About 0dBm?

Step8

NO

Check the freq. at

OSC100 PIN 4 : 26MHz ?

Change or resolder

OSC100

Step 9

Resolder or change

U103

Check component

soldering status ok at

U103

Step 10

Band5 Transmitter is O.K? Resolder or change

UCP300

Step 11

END

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