Ask your seller.
She may need the exact brand and model of TV you plan to use.
However, the time to ask these questions is BEFORE bidding. At this point, if you have paid the item is probably in the mail.
If you have not paid, it's probably too late to cancel and the seller will have to end the transaction with an Unpaid Item Dispute, which will give you a Strike for non-payment and make it harder for you to bid on eBay in future.
