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That unit has a great number of "shut-down" circuits. Most likely it has capacitors dried up in the power supply. An ESR meter is needed to check them. Also, vertical is an issue with that TV. If possible, scope the vert output line and make sure it is working. This will shut the set down rapidly as it protects the CRT's. Rent to own means someone paid dearly for it and it may have a million hours on the CRT's.
Another problem is video drive voltage. The power supply fails and the set detects that as the possibility of too much beam current and protects the CRT's by shutting down. These sets can be very frustrating.
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