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The arc I saw and heard while looking through the holes in the top of the cage were going from the top of the tube or the lead to the nearest metal which was the inside of the cage. A distance of not more than one inch. We've since opened the cage, removed the tube for testing and will replace it with a known good tube. The cage, chassis, everything is very clean. This was a very clean chassis from the beginning. I cleaned it thoroughly and made it shine. Dust, well there might be a very thin film of dust on everything since we hadn't touched this TV since June. Can't imagine that would create the intense arc I saw and heard twice. The fuse at the bottom of the cage you see is still intact. Other than replacing the 1B3 with a good tested one, what else should be check before we attempt the next fire-up of the TV? Thank you for your previous reply.
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