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Check the Boost filter cap. If it goes open it will cause this exact issue. Its a small value cap between the boost and B+.
Ring testing a flyback will only catch hard core shorts in the primary. I have 2 flys here that ring out at 22 rings which is excellent but provide plenty of smoke when in the set.
Keep a close eye on that flyback temp, if there is an issue causing excessive heat and current you can damage an almost impossible to find part.
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