Hello! I bought a Arduino Mega 2560 and a cheap TFTLCD ST7781-touchscreen.
But of course it doesn't work.. 
I connected the LCD_D0-D7 pins to Arduino-pins 22-29.
The driver is ST7781 so I used this library: GitHub - yamsam/TFTLCD_ST7781: Arduino TFTLCD library for ST7781
But the display only flickers..
What's wrong? :