Samsung galaxy S4 I9500 GSM1800 RX 2g Network Not Working Solution

Samsung galaxy S4 I9500 GSM1800 RX Not Working Solution Schematic,Diagram,Circuit

Samsung galaxy S4 I9500 GSM1800 RX Not Working Solution Step By Step

Step 1

NORMAL CONDITION

catch the channel?

Step 2 

Check C136 ≤ -65dBm ?

CHECK soldered

RFS100, L111, C136

Step 3 

Check F100 PIN6

≤ -65dBm ?

Resolder or change

F100

Step 4 

Check the voltage at

C166= V_Battery ?

CHECK soldered

L119, C166

Step 5

Check component
soldering status OK at

F101

Resolder or change

F101

Step 6

Check F101 PIN 25, 26

≤ -65dBm ?

Resolder or change

F101

Step 7 

Check the voltage at
{L105= V_Battery ?}
& {C120, C127 = 2.5V ?}
& {C114, C111, C128 = 2.32V }
& {C119 = 1.8V?}
& {C118, C117, C115, C110,
C106 = 1.5V?}

& {C122, C108 = 1.2V?}

Resolder or change

U103

Step 8

Check the freq. at

OSC100 PIN 4 : 26MHz ?

Change or resolder
OSC100

Step 9

GSM1800 Receiver is O.K?
Resolder or change
U300

Step 10

END

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