Hi,
i wanted to connect my VM8201 controller to my K8200 today. I updated the firmware when building the printer to V2 so i could skip that step. Next i connected the controller (checked the direction of the flat cable twice) and connected the printer to the power supply. It does not work 
I only get two rows ( the first and the third row) of squares on the lcd screen. No data. Not even after a reset. I already updated the firmware again, but no success. I know i have V2 since the endstops don’t work when printing ( With V1 they did apparently).
Does anyone know how to fix this?
thanks in advance
I know you said you checked the cable red strip down correct.
Also check the solder joints.
There is a ground pin on there that is a little hard to solder.
The ground plane acts as a heat sink
There is also a contrast adjustment on the VM201 did you adjust it?
I also checked all solder joints and the cable. These are also fine.
I tried arduin ide 1.0.4. without success…
I think you need to use version 1.6.0.
You can find it in this link.
http://arduino.cc/en/Main/Software
Oh yeah, i also did try the contrast. I also tried tie 1.6.0, no success.
the weird part is that everything but the lcd works. i can list the files from the sd and probably even print from them (have not tried that). I read somewhere that the two black lines on the lcd are from the display driver, when it does not get initialized by the controller board correctly. is there a way to test the VM8201 with an arduino uno?
I only get two rows ( the first and the third row) of squares on the lcd screen. No data. Not even after a reset. I already updated the firmware again, but no success. I know i have V2 since the endstops don’t work when printing ( With V1 they did apparently).