ESP32 DevKit v1 + LCD ILI9486 white screen - no image, SPI pin configuration

Hello
I have an ESP32 DevKit v1 and an LCD display with ILI9486 when connected this way:

#define ILI9486_DRIVER

#define TFT_MISO 19
#define TFT_MOSI 23
#define TFT_SCLK 18

#define TFT_CS 15
#define TFT_DC 2
#define TFT_RST 4
#define TFT_BL 21 // or 3.3V

#define SPI_FREQUENCY 27000000

Unfortunately a white screen all the time , what could be the reason for this are you able to help.
Many thanks in advance

Added after 8 [hours] 39 [minutes]:

I have this display

It is not known whether the problem is on the hardware or software side. It is also unknown if the display is working, so I would suggest running some simple demo program under "best" conditions, i.e. with 5V power and I/O and on a popular platform; e.g. Arduino Uno.
https://www.waveshare.com/wiki/3.5inch_TFT_Touch_Shield
Once you know the display is working (the backlighting of the screen is not proof of this), then you can swap the microcontroller, library, etc.

I would also add that for any analysis the information presented so far is not enough. It is not known what the wiring diagram is, how everything is powered, what the program looks like and what it is compiled with.