I have a 7 inch Polaroid pmid730p tablet.
The screen is cracked and it no longer is responsive to touch.
It turns on and displays the lock screen but doesn't respond to touch.
I could not find anything on repairing this specific model.
I was looking on http://www.ebay.com/bhp/7-tablet-screen-replacement and was wondering if  I found a screen that matched my processor model it would be the correct replacement.
Any thoughts on tablet repair in general?You will want one that references to your exact model ... dont take chances with just any 7" touch screen. Also trying to swap one from a DOA to yours is not a suggested repair path. It will likely break in the process of removal!!!

I had to replace a touch screen on my wifes Kindle Fire and the touch screen is referred to as a Digitizer. The display is under this glass face digitizer, and so you should be ABLE to find a Digitizer for this and then carefully remove it and install a new one.

Hopefully its easier on this Tablet then it was on the Kindle Fire. On the Kindle fire I bought a touch screen replacement KIT off of newegg for like $5 which came with tools with plastic pry tools and guitar pick and a suction cup with ring on it to remove touch screen. It was an Apple Touch Screen repair kit shipped from somewhere in HongKong direct through newegg for like $5. Everything worked good except I snapped one of the pry sticks that were plastic, but with 2 of them I still had the other to work with more carefully. I also located a video on youtube that a guy demonstrated how to open the Kindle Fire and replace the screen, so I knew that I needed to use a heat gun to heat the digitizer glass that was broken and with guitar pick lift the shards of glass out until I got to the still solid 3/4 section of glass that wasnt shattered. It took lots of heat to get the adhesive to loosen to get the digitizer off of the body of the Kindle. Then once that was  out, I had to remove all the adhesive snot balls to prep the surface for the new digitizer. I got a replacement digitizer off of ebay for $29.99 with $5 shipping and it worked. Just had to peel off the wax paper so the new adhesive would stick to the body after swapping the ribbon cable to the main board and then place the digitizer screen into the pocket that it mounts to and then light pressure at the corners to get the adhesive to stick, and then turned it on and it worked like new.

I am guessing you will have to go through a similar process to replace it. Not sure of the cost of your digitizer though. For the Kindle Fire the cost to replace the digitizer from factory service was quoted at $120 and you might not get your exact Kindle back so all your data is gone, and this was for a $159.99 Kindle Fire. I fixed it for $40 myself. And this is used daily by my wife and DAUGHTER for last 6 months with no problems.

My wife said that I should advertise my services with replacing the digitizer screens... My comment was.... Its not a fun process and I hope to never have to do this again! 

** Also I wore safety GLASSES and rubber gloves to avoid pieces of glass from getting into my eyes and fingers when prying the glass out with guitar pick and heat gun... Very slow process and you have to be careful not to overheat the device while also getting the glue to loosen up. The Kindle was very hot to the touch through this process, but it survived it. The BATTERY was removed also through the process before the heat was applied so the Lithium didnt boil.