I am trying to use the Adafruit libraries for ILI9340 and 9341, and besides the display not showing anything, I have seen that the sketch first reads and set some parameters in the display, and while those show up when using a Mega, they show either as FF or 00 when using the maple.
Victor, if you're seeing Serial output, but not any LCD display, when using the Mega, it may be because you need to have the Reset pin connected, as well as 3.3V to the Led pin. Neither appears to be necessary with the Adafruit ILI9341 "shield", but are with the [ebay] modules.
The Adafruit ILI9341 library h.w. constructor and example both default the Reset pin to -1, but you have to add it in in your sketches, eg.
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, 8 );
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
This is just to get the Rduino to work.