if you can somehow search past posts... you'll see my issues with this set... same 46 inch 750. I returned it right before the 30 days was up. the audio sync never got better, and the input lag was horrible. Picture was great, but I spent money to upgrade, not have lip syncing issues...i had a samsung tech come in and try to fix it by replacing pretty much everything... nothign helped. By the way, I had the b640 before too; exact same thing... it must be somethign with their panels... oh well, ive been searching for a replacement ever since; no luck tho.
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