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I have had a similar problem, see http://www.supportforum.philips.com/en/showthread.php?11275-Channel-and-Channel-stopped-working

When the favorites were OK again, I made a copy on an USB memory...

With help from the Philips Repair Centre (outsourced actually) the problem was found to be related to the Favorites List. By selecting another list (List / Options) the Channel + / - function...

Yes, that was the first thing I tried. Problem is still there.

Today after a restart the Channel + and Channel - buttons stopped working. Both on the remote control and on the backside of the panel. Help!

On a 32PFL5007/M08 TV with Q554M-0.96.0.0_bld2e and...