problem with display waveshare 12885 (FAST)

Hi, I have a problem with screen wavshare 12885 (7"). Todays morning i was using it normally, everything was working well. Then i disconnect everything from my raspberry pi 4b 4gb to do cable managment. After 15 min i plugged everything back. I saw that my screen not displaying anything, only backlight and white stripes (as always) in first miliseconds after connecting rpi to power. I connected raspberry to normal, hdmi monitor and it was working fine. Thanks for fast help.

Check the wiring or the display went dead.

thanks. everything with wiring is ok, so i think it's dead 😦