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On the metal box where the two cables from the color wheel plugged look for a tiny rectangular opening in the metal shield---there is a tiny jumper plug there, remove it carefully with a tiny pair of needle nose pliers.
One of the things they do not tell you when you replace the color wheel, it is somewhat different than the original one.
this can happen with the flyback transformer's brightness which can be adjusted , also the power transformer can make humming or buzzing sounds which can't be adjusted , also this can happen with the picture tube or the CRT board failing , and sometimes chips with heat sinks or the IC's themselfs
I had the same problem with the same model. The solution was to replace a capacitor, C622, which is located near a small blue rectangular plastic component. This component is a relay that is controlled by C622. I paid $2.39 for the part, $8.99 for S&H for a total of $11.38. This fixed my problem!
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.