Samsung gt s7562 Samsung Galaxy S Duos S7562 GSM 900 Rx not Working solution

Samsung gt s7562 Samsung Galaxy S Duos S7562 GSM 900 Rx not Working solution Schematic, Diagram,Circuit

Samsung gt s7562 Samsung Galaxy S Duos S7562 GSM 900 Rx not Working solution Step By Step

Step 1

Continuous Rx ON
Channel : 37 CH
Cell power : -60dBm

Step 2

U100 PIN30 ≥ -65dBm?
(L141 using spectrum analyzer)

Resolder L141 or RFS100
Check RFcable

Step 3

U100 PIN22, L110, L115
≥ -68dBm?

Resolder L110, L115
or Change U100

Check Main Chip(UCP300)

Step 4

PIN8,9
L140, L139, L109 ≥ -75dBm?

Resolder L140, L139, L109
No

Step 5

Change U100

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