Here are some of my suggestions to prevent damage during power outages.
1. Get a surge protector (your favorite hardware store will carry it) and connect your electronics in there, including your cable box, DVD player, etc. If there is power outage while watching your TV, immediately turn Off the surge protector. Wait until the power comes back and then turn it On, and resume watching your favorite program.
2. If you do not have a surge protector and have a power outage, disconnect your TV, and follow the same steps as with a surge protector Step #1.
3. It is very important during a thunderstorm to turn it off too, since power outages might occur during a thunderstorm.
If you believe your TV or computer may have been damaged during a power outage, do not try to diagnose or open it. Call an experienced electronic technician in your area.
If you live in Palm Beach, Martin or Port St Lucie Counties in Florida give us call. We have strong expertise and have repaired many TVs with power supply issues, most of them without the need to replace the board, at an affordable price and repair it the same day in your home.