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Sounds like you have a bad flyback Transformer...Crackling is high voltage leaking. I would quit turning it on and replace the main board in the set if you are good at soldering you can replace the flyback transformer but cost wise it is easier to replace main board. 20" might not even be worth the repair.
there seems to be interference via sound as the picture is fine. the interference is a crackling noise& tv is old
1 CHECK SPEAKER
2 so in that case tunning in sound section is disturb get it tnnned.
3 any components in sound section has done defective(SIF)SECTION.
1 CHECK SPEAKER not matching or paper torn or paper cone hard.
You didn't mention if you saw fine white diagonal lines running through the screen from top to bottom. If so, you likely have a shorted Picture Tube which is not usually fixable. If there are no lines seen running through the screen, then it is possible the High voltage transformer which also has a screen voltage and focus control built in that could be bad. I would expect the cost of that part to be about $100, so the repair cost total could approach that of a new set I would guess.
The quick horizontal line through the center of the screen usually denotes a failure in the vertical output circuit, and that would keep the set from staying on. You would have to take it to a repair shop for repair.
your problem is a stand-up printed curcuit pcb it has several mof those small surface mounted caps that always goes bad and the # on the part is SBX1981or SBX1981-51p its part # is 874213400 its about 11 to 15 bucks . Dont try to repair the part as the pcb is eaten up from the caps leaking all over it. Good Luck