I bought a TFT screen and shield and arduino mega.
The screen works fine and sd card too, but the touch works rarely.
I use external 5v 8A power supply for the arduino. The TFT doesn’t get more dedicated power.
I trired many many example from the GUI but, the touch work very hectic.
Calibrated with pen. When the touch works, it is very precise.
It works once at 10 reboots.
UTFT myGLCD(SSD1963_800, 38,39,40,41)