How to Test if an Electronic Ballast for tube light is working or not

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Dear sir, congratulations on the video. I have LGT8258B Preheating start electronic ballast. So far it has worked with 2 T8 2x58W neon tubes - without starter. Suddenly he started flashing and after 5/10 seconds he was dead. I bought 2 V-TAC LED tubes mod. VT-1577.T8.G13.20W I cut off the power supply on the requested side, after installing nothing to do they don't work. To see if the ballast is working, what voltage or current should I find in the output terminal block that powers the tubes? Thank you, thank you very much. Can you help me, thanks.

MondoRockGP
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How much voltages comes at out put end.... If that's is not shown wt the benefit of making video

prasadkarlekar