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Samsung galaxy Grand i9082 WCDMA BAND 8 TX 3G Network not working Solution

Samsung galaxy Grand i9082 WCDMA BAND 8 TX 3G Network not working Solution Schematic , Diagram , Circuit

Samsung galaxy Grand i9082 WCDMA BAND 8 TX 3G Network not working Solution Step by Step

Step 1

Check U101 PIN13 :
About 22 dBm ?
CHECK soldered
RFS100, C152, C153, L100,
L101, L144, ANT100

Step 2

Check the Voltage at
C100 = VBAT_RF ?
Resolder or change
U101, C10

Step 3

Check L105, L106 :
About 22dBm ?
Resolder or change
L105, L106


Step 4

Check component
soldering status OK at
DUF100
Resolder or change
DUF100

Step 5

Check L104, C108, C109 :
About 22dBm ?
Resolder or change
L104, C108, C109

Step 6

Check the Voltage at
C104=VOUT_CHARGER?
Resolder or change
U100, C104

Step 7

Check C148 : About
0dBm ?
Resolder or change
C148

Step 8

Check the voltage at
{C139,C138 =
VOUT_CHARGER ?}
& {L402
= VOUT_CHARGER?}
& {C136, C137,C453 = 2.7V ?}
& {C142, C143,C453 = 2.7V ?}
Resolder or change
U104

Step 9

Check the freq. at
OSC100
PIN1,3 : 26MHz ?
Change or resolder
OSC100

Step 10

WCDMA band8 Transmitter is O.K?
Resolder or change
UCP300

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Updated: 09/12/2015 — 11:03 PM

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