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Hello, sorry to hear about TV issue.
Unfortunately spider lines and big spot indicate broken display panel and entire screen (panel) will need to be replaced to resolve the problem, this kind of repair may cost around new TV price if replacement screen is available with Vizio parts so at this point you would be better off with a new TV.
I wish I had better news about TV, I trust my input will help you out. Please feel free to respond if you have any additional questions.A positive rating to answer would be greatly appreciated, please click on 5 star on this page then click submit/finish button so I can get credit on website for my work. Regards,Shahid.