I have 3 inch distortion at the bottom of my Samsun pn59d6500 tv how do I make it go away.

Some TV's have a zoom function others do not. The program you're watching controls whether the top and bottom of the screen have black bars and is not the fault of the TV. Widening the picture cuts off a lot of the viewable picture and distorts the image. Circles tend to be oval. If your TV has a zoom function, use it.

Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

A TV does not to be dropped to get errors. The screen is build up with a a few million pixels. they are switched on and of in lines and rows.
Bundles of rows and bundles of lines have a combined "switcher" If one bundle gets a poor supply (bad contact or defective electronics) a band of pixels will act different or not at all.
I'm afraid it is a normal defect and you need a tech to solve the problem.
Before you order someone to repair, ask what it will cost, because in 3 years TV sets became much cheaper. Perhaps a new one is cheaper than a repair.

Need the model number to help as I am not sure of you have a RCA or a Toshiba

Best Buy get a new LED TV.

How long did you have your TV? it is been a while then could be burned light bulb problem, check the light bulb see if it is still good. Good luck

You have a convergence problem. Here are some of the most common symptoms. 

Screen looks 3D
One or more colors can't be adjusted when when using the convergence menu. 
Screen is bowed in but stationary.

Solution: 
You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kit for your exact model. The kit inlcludes a photo instruction guide, original Sanyo STK chips, convergence resistors, etc. Everything you need to fix it yourself. Its an easy fix. 

Convergence amps are failing which is very common. Several hundred dollars for a repair.

To properly diagnose this problem,access to the servicer menu will be important.Also,the service literature for the horizontal and vertical circuits may be needed.Contact a tech who can help you that is familiar with Durabrand.