I just bought PFL7656K and i noticed whistling.
http://www.youtube.com/watch?v=g_7GMhM9U78
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%.
http://www.youtube.com/watch?v=JMqtjDqtDZY

But it can be noticed in a silent environment.

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

Sorry for my bad English