Quote:
Originally Posted by Tubejunke
...What is the approach to using a scope or even other test equipment with a "hot" chassis?... Would an isolation transformer be the right way to go?...
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Definitely! Plug the TV into the isolation transformer. Then when you connect the scope ground to the chassis, it establishes that the chassis is at ground potential. If you don't use an isolation transformer, you may have the chassis hot, which is both a shock hazard and an arc hazard.
The scope will have a three prong grounded plug. Use it with a correctly wired three prong grounded electrical outlet and do not try to defeat it in any way. If you trip a breaker or GFI socket, it is evidence that something is dangerously wrong with your setup.