SSD1351 1.5 inch Waveshare don't work

[brandon51100]

Hi,
The display : here
I read multiple times the documentation that come with the display ( here ).
I tried the examples and it didn't work, so I switch with the adafruit libraries for the SSD1351 which is suppose to work with but still nothing happened.
I test it on my two different board :
-The MEGA 2560 R3 from ELEGOO
-The D1 Wifi ( no name brand - see photos )

I'm also afraid because in the documentation from waveshare ( Arduino Tutorial part ) they tell to connect the vcc to the 5v ( What I have done ) but on different website they say to connect to the 3.3v so I'm afraid that i've broke it.

I don't share the code because it was the basic example that come with adafruit lib.

I join multiple photos of my setups to try figuring out .
Sorry for my English.
Thanks.

[xfpd]

Your link shows 3v3 and 5v... both are good:

Operating voltage: 3.3V / 5V

[brandon51100]

Yes I was not sure, I don't know why on the raspberry they use 3.3v and on arduino 5v.
So I think it not work properly