Re: My first antique TV-Olympic Model 755-need help.
Some of that patterning on the image looks like carrier wave interference, in other words another signal there interfering with the main signal. Possibly, some could be chroma sub-carrier interference (the color signal that rides on the luminance signal) causing interference.
Probably, you do not have a signal generator that generates a definite known good monochrome test pattern and modulates that onto a specific RF carrier & channel frequency. This is the type of box (test equipment) that a TV repair person would use to feed the set, to make sure the source signal was known to be good & stable.
The next best move; get the signal you are using to feed this TV and feed another known good working black and white TV set, and see what the signal looks like on that.
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