I have arduino yun board. I am facing similar issue i.e. not able to show anything on TFT screen (make : 2.4" by mcufriend.com).
Any idea what changes we need to make it to show on this TFT display ? I would appreciate if you show the picture of using level sheift register.
Note: I am able to use this same TFT display on UNO using http://www.smokeandwires.co.nz/blog/a-2-4-tft-touchscreen-shield-for-arduino/ library.