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For a number of years as a teenager, I worked on TVs without an oscilloscope. When I finally got one, I couldn't imagine working on TVs without one. Even a cheap one with low bandwidth would make it a lot easier for you to troubleshoot this set. An oscilloscope will tell you whether an oscillator is running and if the waveform is correct. You just can't do that with a DVM. You should be able to find something on eBay. I got my last one from eBay and it was a high end Tektronix for a very good price.
If my house were to catch fire, the Tektronix oscilloscope is the first piece of gear I would remove. 'Nuff said.
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