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need to check if you got high voltage when the picture disappears or what the voltage is. These set still use a rectifier tube. check the rect tube or sub with a known good one. When the picture goes dark need to see if it is in the high voltage section or in the video section. when it goes dark need to pull the service switch see if you a service line, if not then its in high voltage and if you do its in the video section. doing a full recap right now will be just throwing parts in and not troubleshooting. get the set to stay up and running I say it would be a good idea to change caps a board at a time would be the right way to go.
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