Samsung Galaxy Note 3 SM-N900 WCDMA Band5 , GSM 850 RX Network not Working Solution Schematic , Diagram , Circuit 





Samsung Galaxy Note 3 SM-N900 WCDMA Band5 , GSM 850 RX Network not Working Solution Step by Step 

Step 1

NORMAL CONDITION
catch the channel?

Step 2

Check C100 ≤ -65dBm ?

CHECK soldered
CN100, L106, C110

Step 3

Check F100 PIN6
≤ -65dBm ?

Resolder or change
F100

Step 4


Check the voltage at
C166= V_Battery ?

CHECK soldered
L100, C104

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
{L107= V_Battery ?}
& {C122, C129 = 2.5V ?}
& {C116, C112, C133 = 2.32V }
& {C121 = 1.8V?}
& {C120, C119, C118, C111,
C105 = 1.5V?}
& {C124, C109 = 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

END






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