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The High voltage Horizontal output transistor is dead.That the transistor sit outside of the wall of the FBT-flyback tranformer is a black block of plastic with a red wire with a cap hook to a CRT-(tv tube) U have soldering iron,a roll of solders and know basic electronic.The "H" trasistor replaced that and resolders the FBT-flyback transformer,should solved this problems.
You can take off the back of the tv. Look for the red wire at the top of the tube. Follow it down to the part that it goes into. On that part (transformer) there are 2 controlls. The one marked SCREEN, is the one you can turn up and watch the screen at the same time. If the tv shuts off, put that control back to the original position. If it brings up the brightness, then it is fixed. If not, take to a repair shop.