Friend getting it replaced wont be the wisest decision, I would suggest you to try some other ROMs like ASOP CM10.2 version and see if the problem persists, since the lights are working. Hope if that dosent work replacing the LDC will take some thing around Rs 8000 Indian. I don't know about the make of the Sceen, but I guess going to the collection point might just help, else if you can get it to Bhopal or some thing.
Don't risk dis-assemble it, if you are not sure what you are doing .
Well getting the LCD+Digitizer from ebay I just don't know since it hard to find the OEM version ...
IF IT HELPED YOU>===============================