i had this problem also, Make sure to add this to the be config.txt file you will find it on the root of the SD Card
config_hdmi_boost=5
max_usb_current=1
hdmi_group=2
hdmi_cvt=800 480 60 6 0 0 0
then select the 800x480 from the display in the setting but the splash file will keep opening in a wired.
but my new problem will be that i can’t open any video on the screen only once for part of the movie after the first restart it work for a while then nothing work (below is the thread for it).