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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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