There is no further changes needed. If you are getting a distorted picture it's more likely something is not in the right place. Here's a video that repeats that advice.
I don't know the full story (if you posted before, that's information I don't look for) but again, usually just the DMD and we're done.
I'm not entirely sure whether or not you would call this an overscan, but there is a 1-inch black line on the top of the TV. I recently installed a new DLP chip in the TV in order to fix my white dot issue (success) but now this occured. Can someone please give me a solution? Christmas is tomorrow and this is a gift for one of my friends. Thank you everyone!