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It sounds that the settings have been corrupted. It will be best to contact the authorized service center to make this set right. Beware, not to make any experiments hereafter. It's 'PHILIPS'
you have a bad Y Sustain board or X Sustain board undo the back (if you know how to deal with electronics) and with the TV unplugged disconnect one of the board and turn on, see if works or not and try with the other one till find out wich one is. Fosg2000, Rate me
Two problems: first, tv turns off for about 10 seconds after being on awhile, then turns back on. 2nd, picture will sometimes go black horizontally displaying only half of the upper screen. This will go on for about an hour off and on.
If the backlight is not turning on, you should be able to see the lcd image by shining a bright flashlight at the screen.
Backlight inverters are loud, so you can hear them operating (high pitched whine) and if the backlight is coming on, you can see white light leaking around the edge of the screen, and even a little inside the cabinet.
Philips are legendary for having power supplies that fail due to bad capacitors, so that could be the culprit as well.
The lower "Y Buffer" board is defective. Best repaired by a technician, or contact Phillips support for the part if you think you are able to replace a small circuit board on your own.
I have samsung 40" LCD tv and it's happening the same thing. I turned it on and it last for 5 minutes and the screen went back but the audio is fine. I turned off and turned it back on it worked fine but an hour later it happen again.
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