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

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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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