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Problem is in either power supply or the Y-Sustain board.
The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.
Often there are fuses on that board - one or more. Check those.
if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.
Good luck in solving the problem also be careful in handling the set because it contain high voltage....
This is called tiling and this happends because of a weak signal from whatever device you have hooked to it weather it be cable or a sat dish. Try checking and makie sure you have good signal to this. If this matter gets wrose then you would need a repairman. Thanks