Have you ?
If your code is so big, did you develop it in stages, getting each stage to work separately before going to the next.
Then combining them one at a time, getting the combination working before adding the next.
This method will minimise the red herrings that a massive code is written, then tried to be debugged logically.
Please write a short code, possibly the library example and see if it works.
If not, then post the short code and a circuit diagram showing how you power and connected your hardware.
What is the display, please post links to data/spec.
What library are you using?
What model Arduino are you using?
When you wired up the display did you use a display example to see if the display works? It's simple, select from examples the display library and then select an example. Change the example to match the pins being used, load it up and see if it runs. Does it? See no need to post your 1000000 lines of code just post the display example code that is not working.
OK b707,
this is all due to an oversight, an my idiotic mistake.
I followed the print command with 'tft.fillScreen(TFT_BLACK)'.
That's why I couldn't see anything on the display, if I had used TFT_RED (or another colour), I would have avoided bothering you and not made this bad impression..
Thank you for your attention.
Roberto