Call customer service in your TV book that came with the TV. They will find you a repair shop near you to get the part you need to replace. If it is not replaced it will eventually burn out and the TV will not work at all. I hope this helps, I had similar trouble with mine, had to replace the part. It eventually went out again so I just tossed the TV and bought another. I got 5 more years of use out of the first replacement part.
debro49 has absolutely right, don't try to fix it alone. Call customer service and even they will guide you through the phone, or they send someone to help you.
It is recommended a technician to make this TV repair. If you need any recommendation I suggest you this one: www.tvrepairjacksonvillefl.com
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them