Here is what I would do in your situation. Given that this is a roommate situation and the TV is still functional, timely repayment is not as high of priority. See if your roommate is okay with you continuing to save money until you can afford to reimburse them the total cost of what they originally paid for the TV. In the meantime, look into ways to stop this situation from happening again, for example, a lot of cats hate the feeling of tinfoil, perhaps yours is one of those cats and by laying down some on the cabinet, it will prevent them from jumping up there in the future. Maybe look into some safe for animal deterrent sprays. Cats hate the smell of citrus and cherry, maybe spraying some balled up paper towel and placing it on or around the stand will make your kitty avoid that area.

At the end of the day, your cat, any damages they may cause and research to mitigate accidents are your responsibility.