Got the TV yesterday and got it to show something today. I was stored for more than 10 years and had AC power cable cut, but still works. Nice thing about this  TV is that it is truly portable and can be powered from 12 V supply. Picture shows it drawing 0,6 A at 12 V. I used TV pattern generator with RF output to produce the signal. Next step is to open it up and see how the signal looks like after TV detector and if it looks anything like video signal from the generator.