The melody that plays as you turn the televisions on and off are a design feature. Some people like it, and some don't.
The good news, of course, is that you can turn it off if you prefer to do so. The instructions are available on Page 60 of the users manual (for the 650), but for your convenience, I'll list out the instructions here.
Using your remote,
MENU > SETUP > External Settings > Melody > toggle Off, Low, Med or High
Turning off the Melody will disable that noise when you turn your television on and off.
Let me know if you have any other questions, and we appreciate your support of Samsung products.
I have a 32" Series 4 and a 46" Series 6. I love both tvs for picture quality and HD capabilities. Yet, I am disturbed by a feature both TVs have that I can't figure out how to disable.
When powering up and powering the TVs off, they make a weird noise. Does anyone out there know how to disable this feature. I can't find anything in the tv options or the manual. Am I stuck with annoying feature?
Thanks for any help!