Have TV Questions? Ask a TV Technician
Hello Donna and sorry you're having problems. This issue is most commonly caused by a failure with the power supply board in the TV. Regarding whether you can fix it yourself- that all depends on what you're comfortable with? Are you comfortable removing the back of the TV and using a Multi-Meter to measure some live voltages (they're not high voltages- and they are in DC not AC, but you'd still be working within a live TV)?
Or, the layman's approach is to purchase and swap the power supply board out- since it's the MOST likely and common cause of this problem.
If either of those solutions do not work for you, a shop will typically charge $200-$225 parts and labor for this repair and can be located at the link below:
Other than that, I'm sorry for the bad news and wish there were a quick fix.
If you need further assistance let me know. Please do not forget to click a POSITIVE RATING before you go- as it's how I am credited for my work. You can follow up at any time, at no additional cost.
Do you need further assistance with this?