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Hi Guys, I'm trying to add an MKS TFT28 screen to my RAMPS but I can't get any communication between the printer and the screen. Screen boots up, RAMPS boots up, both have the same baud rate but nothing, I can't control the printer neither see temperature info...
I've tried two different screens against two different MEGA/RAMPS and always the same...
Somehow, if I connect the screen and the USB at the same time, I can see temperature info in the TFT... It seems to be some kind of issue with the TX/RX...
I'm using straight 12V supply to the screen, but the same PS for the whole system.

Did anyone else experience something like this?

Thanks!