I just bought PFL7656K and i noticed whistling.
I contacted my local helpdesk.( We are aware of the issue, please contact your local helpdesk (start here (http://www.support.philips.com/suppo...g_selector.jsp)), and ask for a Service intervention. You may refer to "SCC_89955".)

And they updated sat tuner software. Now whistling volume decreased by 80%.

But it can be noticed in a silent environment.

My first question is
All PFL7xxxK series have that problem?
Are you planning any other update for whistling sat tuner in the future?

Sorry for my bad English