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Samsung galaxy S4 I9500 WCDMA Band5 GSM 850 RX Network Not Working Solution

Samsung galaxy S4 I9500 WCDMA Band5 GSM 850 RX Network Not Working Solution Schematic,Diagram,Circuit

Samsung galaxy S4 I9500 WCDMA Band5 GSM 850 RX Network Not Working SolutionStep 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 29, 30
≤ -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

Band5 / G850 Receiver is O.K?
Resolder or change
U300
Step 10
END
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Samsung Galaxy S4 I9500 WCDMA Band5 GSM 850 RX Not Working Solution 

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