Help?

I have a 7" multimedia system unbranded it has a problem that when you switch on the ignition the motorised screen doesn't come out you can sort of help it out and when it's out it does return so the motor is ok it feels a little tight the rest of the unit and functions work fine, this only recently happend when I turned off the ignition halfway through its opening and it returned but not all the way it still closes fine except the last 1/4"