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take a look at this how to: http://www.supportforum.philips.com/en/showthread.php?2223-Important-Bugs-which-need-to-be-fixed-in-2010-firmware-(TV550R1)/page8

how to realize negative sleep timers (even with 140 firmware):

1. set timer to 5 minutes
2. wait until the tv warns you, that it will turn off in a minute
3. go to the sleep timer menu and set...

Spottet another bug: Negative sleep timer value after playing around with the sleep timer, waiting some time and resetting it again. Doing that several times brought me a negative 4 minutes...

440

Had you ever seen a negative sleep timer? I don't think I was dreaming this...

439

I like my 46PFL5605H/12 (Firmware: Q5521:01-140.39.0), but I hate working with these menues. Usability is far...