I received 3 Bell phones today and am very happy with only one of them. The two that do not work have the same problem, they do not produce a tone when a key is pressed,

I read on a previous forum that this was a common thing in W.E. keypads.

When a key is pressed the volume goes down, but nothing proceeds.

I heard it can be the transistor or maybe a bad connection?

Problem is where to start looking. Maybe you can help?