Samsung gt s7562 Samsung Galaxy S Duos S7562 GSM850/900 Tx not working Solution

Samsung gt s7562 Samsung Galaxy S Duos S7562 GSM850/900 Tx network  not working

Samsung Galaxy S Duos S7562 GSM850/900 Tx network not working Step by Step Solution 

Step 1 

Continuous TX ON

CONTINOUS TX ON

 CONDITION
TX POWER DAC:14500 CODE
APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm

ATT. : 20dB

Step 2

Check Output power of RFS100
≥ 31.5 dBm ?

Check Main ant. contact & L131,
L103,C122, L107

Step 3

Check Output power at
R101, C169 ≥ 11dBm ?

Check the Ant.
switching diagram of U100
TP_ANT_SEL

Check GPIO control (UCP300)

Resolder or Change U100

Step 4

U100 normally is operated

Change U100

Step 5 

Check UCP300

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