black screen but everything works? pantech android

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http://androidforums.com – I have an android pantech from verizon. My screen is completely black. I have dropped it a couple of times. I've had it for almost two years. I purchased a new battery because my battery got overheated and my phone started turning off suddenly, draining the battery. My phone all works. I can feel the vibrations. So I just pull my battery then i can see my screen. But if i dont touch my phone at all for a while , it will go black. then i have to do the same process of pulling my battery. What is causing the problem with my black screen? Can it be fixed? How much money will it cost? (General)