Samsung galaxy S4 I9500 WCDMA BAND1 TX 3G Network Not Working Solution

Samsung galaxy S4 I9500  WCDMA BAND1 TX 3G Network Not Working Solution Schematic,Circuit Diagram

Samsung galaxy S4 I9500  WCDMA BAND1 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 22 dBm

NO

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 7

About 22 dBm ?

Resolder or change

F101

Step 6

Resolder or change

C114, C140

Check U102 PIN 13

About 22dBm ?

Step 7

Resolder or change

U102 

Check U102 PIN 24

About 0dBm?

Step 8

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

Band1 Transmitter is O.K? Resolder or change

UCP300

Step 11

END

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