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It seems to be a PSU (Power Supply Unit) problem. When you unplug it and replug, the screen comes on for a moment. That means that the capacitor does not hold charge for long.
Open the back and look for bulged or burst capacitors on the module where the power cord meets inside. Replace the whole module if you can not replace the capacitor with exactly the same specs.
It's doubtful your dog caused the problem; this model has seemed less reliable than most Sanyo products, there are many threads to be found detailing a number of different failures.
The problem is most likely related to the power supply but its behavior could be caused by protective circuits and a failure in the high voltage section.
You may have trouble having the set repaired for less than the cost of replacement. Parts specific to models over 4-5 years of age may be tough to find and you may be without TV for weeks if you choose to repair it.
sanyo does this alot it is either you need to replace your tuner or you have two resistors 220k ohm s that need to be replaced.this will fix your problem.if repair cost is cheaper to fix then buy a new one its up to on that one!
dont know for sure but i think that the tube is going bad. Have one in my shop doing almost the same thing.Taped on the tube and it does strange things. My tube tester wont test this kind of tube that is in these sets.Not much help but it is a start.