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The popping noise could just be corona arcing around the flyback, or around the suction cup at the CRT. Also the high voltage might be running too high, as that would also cause it. It's normal to hear some crackling when the set is first turned on and turned off, when the HV hits the picture tube. Corona arcing can also cause streaks and speckles in the picture. Also the capacitors mentioned, it would be a good idea to change them. Easy job. I remember changing a lot of those. If your getting HV, (which you are), I doubt if the flyback is bad. Could be some arcing around it, and if there are cracks in it, you can use some high voltage dope, (It's sort of an insulating paint), paint it on where it is arcing and let it dry good before powering the set up again. Humidity and moisture can also cause it to arc. As the set warms up, the moisture and condensation goes away and the arcing stops. I've experienced where people bring a TV inside after it has been setting in the cold, (especially in the winter), turn it on, and snap, pop, crackle, and they end up blowing other components. I bet if you do have to replace the flyback, you can find them on the web. Just google the part number, and do some searches. MCM electronics used to have a lot of replacement flybacks. Watching your video, it also could be the focus voltage arcing in the CRT socket. Also clean off the flyback, especially where the wires exit the flyback, and if there are cracks, see if you can get some HV dope and coat it. If you have a HV probe measure the HV to see if it's within specs, and also you can run the probe around the flyback to see if you get any discharge around or through the housing of the flyback. Just make sure you have the ground wire of the probe connected solid to the chassis ground, or yes, you will get bit!
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