Here is the solution for Samsung Galaxy E5 key not work on / off problem. This solution may help fix if the phone shows charging indication or charging icon when the battery charger is plug-in, but could not or can not turn it on.

Samsung Galaxy E5 Power On Off Key Jumper, Track, Ways
Samsung Galaxy E5 On

Samsung Galaxy E5 In the power ON-OFF, other than it is in the matrix keyboard flex is also connected to the keyboard filter IC. The solution below shows the connection line paths of the power key, this is useful without changing the filter IC and this can be used without having to connect the power key filter IC.

Just refer to the solution given below and track said main power line roads.

Only manage to apply a jumper wire in places where the Samsung Galaxy E5 connecting said power key. This can help change without compromising the IC filter matrix or keyboard flex.