bring up 3.5in TFT LCD on Arduino Due, issue in SPI

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Hello David & other experienced friends,

I am using ADAFRUIT 3.5inch COLOR TFT LCD with Arduino Due.
I already have 3.5in TFT working good on MEGA in 8bit mode and SPI mode fine working.
Now I trying to make same TFT on Arduino Due in SPI mode, all the wiring and setting up exactly as on tutorials and 100% re-checked for no mistakes.

  1. soldered all SPI and 3.3V , GND interface.
  2. shorted IM2 jumber on TFT pcb.
  3. tested same setup of LCD on MEGA and TFT LCD working. that means soldering and connections are perfect.
  4. No mistakes of power supply 5V i tried both 5V &3.3V as well.
  5. experimented LCD supply 3.3V and 5V both , LCD works on MEGA board.
    Trying to run sample code from example project (as on tutorial) software is successfully compiled and flashed without any error, but TFT LCD not displaying anything.
    Final words, the only difference between MEGA and DUE is voltage level, MEGA is 5V and DUE 3.3V.
    I choose 3.3V supply from DUE board to TFT LCD board power 3.3V-5V supply line. is it correct ??

is something wrong? or i missed something ?
Please help .
thanks