Turn on power, but no picture, when you turn off power see picture for a few seconds before tv shuts off
When I turn on my Philips 50 inch tv the red power button lights up and it sounds like TV turns on, but there is no picture and no sound. When I turn the power off, you can see the picture for a few seconds before the tv turns off.
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Philips TVs tend to have issues with bad capacitors in their power supplies. Failing capacitors tend to have slightly different ESR (equivalent series resistance) values when they have been left off, versus after they are warmed up and charged up. Either a new power supply board or replacement of the faulty capacitors will fix the problem.
Commonly it's going to be a power supply related problem. The two boards that need to be looked at is the Main Power Supply Board or the power supply board for the screen. The one that powers the screen, some manufactures call it a Backlight Inverter Board.
If you have some electronic experience, you can sometimes find a Service Manual for the TV over the internet for less than $20. It will have the all resource material for repairing your TV model. It's just the matter of replacing the bad part on the circuit board.
We have a 50 inch magnavox plasma screen. We found and used a fix from fixya! It only costs us $34.00 campared to the $300.00+
anyone wanted to look at it. The problem was on the powerboard but was two little capacitators with the model #3300 10v. We carefully took the back off the tv and removed the power board, went to a local electric supply store and bought the 2 parts for $2 each, we then found someone (tv repair shop!) to sauter the new ones on! Got it home put it back together and it stayed on, no depressing shutdown after a few seconds! you can find a picture of a fried capacitator on yahoo images, they are supposed to be flat but if defective will be bubbled at the top or even split! I am calling Magnavox today to complain that they are not recalling this part that should have been a better quality capacitator! Hope this helps some people!!
Well, first your model number is the 42 inch, but I digress...
I had a similar problem with a Viewsonic 27 inch, with the blinking power light on a failed power-up. It turned out that replacing the power transformer was the ticket. However, as I have the 50 inch Panasonic plasma, I know that the transformer is built into the set itself. I'd still suggest that this is what needs replacing though, as this is different from a set being on but having no picture.
it could have over heated you can try to reset it first unplug it for about five minutes and try to turn it on if that dont work the remote might have a set button try holding that down until the red light flashes twice, then turn it on if not then hold the power button down on the set for a good five seconds to see if that resets it. if none of that works you will have to go to panasonic .com for the reset instructions.with the red light blinking the power supply is most likely good you just need to reset i.