Hello my name is Eric,
Welcome to Just Answer
I can help you with this issue,
The buzzing you hear is a bad color wheel
Unforunately the color wheel is part of the light engine.
part # XXXXX $731 at encompass.com login as a guest
A repairman would charge about $250
if you need more help please tell me
What number best describes you
1. I just want to know what to expect a repairman to charge me,
2.I want to try pushing buttons and checking connections
3. I will open the TV if needed, but have limited tools and skills
4. I have technical skills and have a soldering iron and or voltmeter
If I have helped you with your issue please click accept.
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I will reply asap
That $250 would just be the labor charge.
The light engine would cost between $600 and $750 just for the part
It may be better to just buy a new TV