Samsung GT-C3322 Metro Duos Key Input not Working Solution

 Samsung GT-C3322 Metro Duos Key Input not Working Solution Shematic,Diagram , Circuit 

 Samsung GT-C3322 Metro Duos Key Input not Working Solution Step by Step

Step 1

SIM Switch key

working?

Check the TACT300 (crack, open, etc) &

change the TACT300

Step 2

Function Key &

3x4 Key working?

Check Dome sheet (crack, open, etc) &

Change Dome sheet & UCP20

Step 3

Key LED working?

Check U302, LED300~305 (crack, open, etc)

& Resolder U302, LED300~305, R323~R328

Step 4

Check the S/W setting

(key auto lock, etc)

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