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Samsung galaxy S4 I9500 WCDMA Band2 GSM1900 RX Network Not Working Solution

Samsung galaxy S4 I9500 WCDMA Band2 GSM1900 RX Network Not Working Solution Schemati,Diagram,Circuit

Samsung galaxy S4 I9500 WCDMA Band2 GSM1900 RX Network 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 23, 24
≤ -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

Step8

Check the freq. at
OSC100 PIN 4 : 26MHz ?
Change or resolder
OSC100

Step 9

Band2/PCS Receiver is O.K?
Resolder or change
U300

Step 10

END
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Samsung Galaxy S4 I9500 WCDMA Band2 GSM1900 RX Not Working Solution 

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Updated: 09/12/2015 — 11:03 PM

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