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Re: Picture and sound went out suddenly on a Sony...
Sony has problem with bad picture tubes as well as flyback transformers .if you have shorted hori output then replace it if set shorts it out again your looking at bad flyback transformer as well as maybe leaky tube.
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Your TVs Base card socket, that is the socket connected to the base of the picture tube is loose. Just unplug it and replug again for tow or three times. Please note for any loose sodering occurs to the pins of the socket and the video output transistors fitted on the picture tube base card. This should rectify the problem.
The most common reason for no power on your set is a shorted hori output NTE 2353 , and right behind that part is a 1200pf 2kvolt capacitor check it also check out STK-392-150s one of them may control part of start up.