I have just received a sony projection 52" tv model # KPR-53EXR15. And while it is a nice tv. it flickers black. The person who I received it from says it needs to be cleaned, but I can't find any information. The TV is about 9-10 years old. Any info on how to get it cleaned(as I want to have a idea on what needs to be done before I pay someone to do it), if its possible to clean it myself, and maybe some cheap methods of fixing the black flickering would be greatly appreciated.