Initially happened with an especially bright image. became more frequent especially when cold. the picture skews in from the sides (variable depending upon the brightness of the signal image) - then shuts off. have had to watch snow for 10 mins to "warm it up", then could switch to a signaled channel. now will not stay on.
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The old Mitsubishi units had a super capacitor in the logic circuit instead of a backup battery. This capacitor became leaky over time, causing the problem you describe among others. Number one symptom is set has audio and dark or black picture when powered up. As the super cap charges to full voltage, picture comes and goes.
Perhaps you try this question in the category Phones or android devices?
This question became between camera flashes, you know the things that give a bright light for a short time, when a picture is made.
A stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, especially when taken outdoors (for shutter stuck open).
To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see the following for further info and a simple fix that may help:
This sounds classic to a thermo problem where a part(s) are becoming thermo sensitive with aga and use. When the set is cold and then warmed up, the defective part(s) is changing characteristics.
Some components became thermo sensitive that are driving the display. Or an embeded component in the display itself became thermo sensitive. It is very possible that the fault is on the board that does the X - Y addressing or on the backplane electronics of the display screen itself.
Using the set with defective components is a bad idea. If the part(s) fail completely and go shorted or opened, other more costly damage can be done.
The service rep for the manufacture of your set is equiped and trained to be able to troubleshoot and service your set.
You will have to take the set in to have it serviced.