Samsung B355E Call Button keys not working keypad problem

Samsung B355E Call Button keys not working keypad problem

Good afternoon, today had the opportunity to repair Samsung B355E after another workshop. It came to me with a diagnosis does not work call Button and two navigation buttons to the right and down .
[caption id="attachment_30449" align="alignnone" width="1306"]Samsung B355E Call Button keys not working keypad problem Samsung B355E Call Button keys not working keypad problem[/caption]
Naturally previous "master" soul "fry" board, processor, and memory. Changed the filter on the keyboard Z2550 , but the desired result is not brought them. Then the phone and sent to me.

Started prozvanivat exactly what channel keypad bus comes. It turned out that the bus is broken Col2 .Based on the phone's circuitry Samsung B355E via Col2 has a test point J2567 , I decided to check it comes to whether this channel.And I was surprised that it was in a place of transition test point J2567 for the processor gets wet and otgnila conductor portion. Restored break and it worked.Here's how it looked before and after repair:
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