Probably the convergence board.
First, try resetting the TV by unplugging it for 30 seconds and replugging it.
Does the problem exist on both cable/sat and an external source like a dvd player/vcr?
Go to
www.usasupport.philips.com and enter 60pp9200 as your model number - click on the link for the "Quick Start" Guide - read p 8 on manual convergence - if the manual convergence fails, then your convergence board is bad.
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