Hello all, I've owned a 42pw4b for several months now, totally silent running, but the past couple of days I've noticed two fans running (one either end of the unit), the fan noise isnt intrusive (not like the buzzing thing Ive heard about - but don't experence). Is this a fault? should they be temperature controlled? They come on immediately I switch the display on. They may have always been running of course and just got louder??! Cheers, Phil.