Apparently this is a firmware (software) problem that has been fixed via a software upgrade. You can download it from Philips' web site, copy it to a flash drive, and load it into your TV via the USB port. I did, and this problem has not returned.
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Sounds like Back - light problem.Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis.If you wish to get some details; check the site linked here.Surf the site with patience.Pull up older posts.It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS].In such cases, the power supply board might need replacement.To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself.If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board.If this is the case, you have to replace the main board.
Try unplugging from outlet for fifteen seconds. Press the power button for a few seconds "before" plugging back in. Now plug back into the wall outlet and try turning it on to see if this reset the TV's settings.
tThe diagnostic circuits is shutting your TV down. In most cases the set will shut it down immediately. Apparently your set hasn't shut completely down yet. When you turn your TV on the diagnostic circuits send a low voltage, low frequency signal through all the circuits and depending on how they come back whether the sets powers up to full power. If a problem is detected it will shut down to protect the other circuits. It sounds like you might have some capacitors going bad on your power board. A capacitor that is going bad would let it come on for a few seconds then the diagnostic circuits would see the capacitor getting further out of tolerance and shut the set down. If you are a DYS type person you might want to lay it flat of it;s face and remove the back. A bad capacitor will be bulged out on the top. are Replace capacitors with the exact uf value and if you can go above the rated voltage but never below., If this isn't the problem then it is probably the main board (the board where your cable hooks up to), There are other things that cab causes for this but I would check the capacitors first.
Col. Dana Gillespie
You have to start checkin from its main ON/OFF switch itself. If the switch have any contact contact trouble, the set will not turn On, even though you hear the click sound from the switch. If switch is Ok, then you have to come to the power supply regulator board. It can be easly recogonized the powe supply regulator boad. The main supply line will go straight to it. There will be more that 5 or mor secondary voltages from it, according to Tv model. These secondary wupplies will energzed only after the power supply switching circuit work properly.
Ther is a fuse [ a cartridge type; replaceable]. Check the fuse first. If it has blown; be carefull when you replace it; because there must be some reason for the blowing of that fuse. It is really a protection device. Before replacing it, you have to check the entire power supply board for some short circuit. If you have sound knoledge in repairing Switched Mode Power Supply [SMPS]; just proceed. Otherwise get it repaired by any experienced service technican or by authorised service center for Proscan. OK.
The X-Ray Protect circuit monitors: * Excessive High Voltage * Excess CRT Beam Current * Excess HV Circuit Current
X-Ray line is normally High. If any of the monitored sources exceeds
its' specific reference, the X-Ray line is pulled Low, shutting Off the
TV. If X-Ray protect shuts the TV Off, pressing the Power button will
turn the TV back On ( it will shut Off again if the problem still
Possible Problems: Power Supply Fault, Sweep Circuit Problem, Doubler Board Fault
or a leaking CRT. You may have bad capacitors in the power supply or the
sweep power supply.
Check for CRT leaking, few drops of clear light oil. If this is leaking the fix is costly and not worth fixing. Inspect for puffy capacitors on the power supply and sweep circuit
boards, if you can solder replacing capacitors is cheap, middle pricing for replacing power supply or circuit boards.
This is not a unusual amount for repair. Most repair facilities do not like using used parts on sets they have to warranty after a repair. They would then be liable if were to fail and then they would be replacing it at a greater cost to them. You could check with Sony and see what their retail cost is on the part. Their Customer Service Line is 1800-222-SONY.
I hope this helps,