Did you switch the wiring harness, if not try that.by RJH - Prusa i3 and variants
MuckYu It looks like your heat sink is on backwards, the fins should face the fan.by RJH - Prusa i3 and variants
I got my LCD from FT and use Marlin from FT and it works good with or without a PC. I did not change anything to make it work.by RJH - Prusa i3 and variants
I found the best way to check the voltage is to put the ground test lead into the ground pin hole for the second hotend driver. Then you can check any driver pot with one test probe.by RJH - Prusa i3 and variants
You do have to hit the home button before the axis will move in both directions.by RJH - Prusa i3 and variants