Backlight lcd diplay doesn't work

Hello, when i touth the ‘shift’ button the display doesn’t work. I can only read it in darkness whem i put a light on the dispay. Can anybody help me?

What display?

Cerbo??

Ekrano??

CCGX??

I upload a foto off this display

i upload a foto off the display .

Press the button near the display to increase the Brightness when the GX card is active.

Look in it´s manual, Chapter 5