Replace 2 capacitors on the power supply board (the board where the ac cord plugs in) They are side by side. Both are the same value. 3,300 uf (microfarad), 16 volt if I remember right. They are EASY to see. The tops of the bad capacitors are bulged outward. The tops of every other capacitor on the board will be smooth and flat.
Then go to
www.support.phillips.com and download the software upgrade for your model onto a flashdrive and plug it into your tv. Now cut the tv on and the software upgrade will take place automatically (It's best to select the "auto" part at phillips.com when you download the software).The tv will display "upgrade successful" and prompt you to remove the flashdrive and restart the tv.
I have repaired 3 so far. All required the same repair. All sets were 2 years old. Good luck Barney in Raleigh, NC USA