Samsung gt s7562 Samsung Galaxy S Duos S7562 DCS/PCS Tx Network not Working solution

Samsung gt s7562 Samsung Galaxy S Duos S7562 DCS/PCS Tx Network not Working solution Schematic, Diagram,Circuit
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Samsung gt s7562 Samsung Galaxy S Duos S7562 DCS/PCS Tx not Working solution
Step by Step

Steady TX ON

CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
DCS CH : 685
PCS CH : 661
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB


Step 1

Examine Output energy of RFS100
28.5 dBm ?

Verify Important ant. contact & L131,
L103, C122, L107,

Step 2

Verify Output energy at
R100, C164 8dBm ?

Examine the Ant.
switching diagram of U100
TP_ANT_SEL

Verify GPIO management (UCP300)

Resolder or Change U100

Step three

U100 usually is operated.

Change U100

Step four

Examine UCP300
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