RepRap discount smart graphic controller encoder not working

[Roberts_Clif]

I have never used the glcd tester, though if you post more information about your DIY 3D Printer the forum and I will help you to solve.
Have worked with Marlin configuring most versions 1.x.x - 2.x.x on Reprap controllers helping many get there configuration and connections correct.

The first time working with 3D Printers I connected some of the cabling incorrectly this did not cause the controller to die,
though fixing my cabling mistake was essential to having everything working correctly.

This could take some time as repairing anything over a forum requires many hours.
We may need many photos showing your DIY 3D Printer setup and copies of your Marlin firmware configurations.
Will need to know your hardware configurations XYZ and E, Lead screw and belt ect.....