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Pin 7. What you are checking for is to see if the plate voltage drops to zero when in the service mode. I was doing some reading on RCA's and if this set has the same video out circuit, then it may have the same issue. If the 5.6k power resistor opens up (its on the service switch) you will lose plate voltage to the video out tube while in the service mode. The symptoms of an open resistor is very critical brightness setting.
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