Chosen Solution

The title pretty much tell the story have to knock on back of unit for screen to come on I figure its a loose connection but I never open one of these critters any help would be appreciated

@shonzman , nh1 , This tear down guide link below should work for you. It should get you inside so you can check all the connections and components. Good luck. I hope this helped you out, if so let me know by pressing the helpful button. LeapFrog LeapPad Ultra Repair Motherboard Replacement