[Popester]

Sony’s will need a schematic for sure. Most designs have a low voltage power supply to start with but they often have derived supplies that run sweep,video, and sound from off the fly back transformer that is rectified. The older sets had an HV block that stepped up fly back voltage and rectified it for picture tube high voltage and focus voltage. It was usually red in color. They could crack and fail over time causing a carbon path to ground. Check the obvious things like poor solder connections and fuses. Others should chime in too, but without a schematic you’ll find it hard to get it going unless it’s something very obvious and simple. Older Sony’s from early ‘80’s had HV shutdown circuitry that would shut down the sweep if something failed or got out of wack. Good luck on your project.