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Look at the horizontal output transistor then the fly back transformer.Check ALL the voltages coming from the power supply. One or more of them have to be missing for the audio and video to be gone at the same time.
you need new Convergence ICs which is a fairly simple repair. Post your model number and I will post the STK numbers of the ICs you need as well as a link where you can get replacements that come with free installation instructions with pictures so you can do the repair yourself.
Hi voltage on power supply voltage, and or flayback problem. only a tech can find the problem for you, 60 to 80.00 depending on the tech if is just the power supply . with flayback 130.00
hope this help you to make a descision