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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