My old ocean that i had before used to do this thing.
Whenever you closed the phone, it would go black like normal and inactive. Within a few seconds the backlights came back on and the wallpaper showed even without touching it, then went back black and inactive a few seconds after.
I always thought it was normal and didnt care much of it.

I got a replacement Ocean and this one has been working fine but it does that thing where when you close it, it lights back up a few seconds after, exactly like my old ocean.
However, this time it doesnt show my screen/wallpaper. The screen is black but the backlights just come on. Goes away after a few seconds.
(im afraid its a screen problem like my old ocean)
(My old ocean's screen wouldnt work. Whenever i slid it up or to the side the backlights would come on but screen was completely black. I couldnt read texts or see anything. Only thing i could do was recieve calls)