It might be worth checking the ribbon cable for the top screen is tight in the socket on the main board, this could explain why the screen gets back to normal when you close the ds then reopen. The ribbon cable for the top screen is in the hinge on the left side of the ds when open, the only way to check this is to take the back of the ds, to do this you will need a small philips screw driver and a tri-wing screw driver which you can get of ebay quite cheap. The worst possible fault is the top screen is faulty and needs to be changed, if you do a search in youtube you will find videos on how to do this, they are good and quite detailed. hope this helps.
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