To add to Daniel's comment, you can do it either way: make a single offer for the pair, or list them each individually.
In your place, I would make a second listing for the TV, describe it fully, and mention the ad you have for your TT. You could also then suggest that a buyer that took both could benefit from a discount.
If you do it that way, you might be wise to add a similar statement to your existing listing for the TT, and point potential buyers to your new ad for the TV.
In this way, you can offer buyers whatever they want. Just my opinion though, you do whatever you like.
Like the burger chain advertises: "Have It Your Way".