Full Graphic Smart LCD_blank screen

Hello everyone

so, today i got my new LCD controller. I connected it and made adjustment in Marlin firmware.

Without the USB connected the LCD didn't worked so I suspected there's something wrong with Arduino mega 2650. And it is - it doesn't work even when additional adapter is plugged (5 V pin is fried or something?), but it works normally connected via USB.

But here is the problem - the LCD should work when Arduino is connected to computer - and it kinda does but it shows blue screen without any characters. And no, it's not contrast.

Any ideas? I attached an image of the LCD when Arduino is plugged via USB.

I had problems with Ramps 1.4 before - D9 pin was fried (I was using it for the fan) so i soldered a new one. After a while I thought the thermistor was going nuts - showing a temperature of 60 degrees celsius with heatbed not working, but with a new thermistor it was the same story - so it's Ramps but I don't know why. And today I discovered the Arduino is not working properly as described above.

Thanks in advance!

I think that we have the same problem. I stumbled across your post while looking for the one that I just made. This forum's FIND works as well as my Smart LCD !!!!!

Bill

I had the same problem then found that I had the ribbon cables mixed up. Swapped them over and all was well.

This Video helped me set up mine. Also the contrast knob is very touchy. Bumping mine can mess up the contrast making text unreadable.

Edited 1 time(s). Last edit at 08/07/2015 11:01PM by gmckee.