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Have you hooked an antenna or DVD player to it yet to check for sound?
Sometimes a set won't make any noise till you get a signal through it, does it make any crackling noise when you change channels, this would at least indicate your audio is working.
Can you tell if theres any high voltage? you can hold the blade of an insulated screwdriver near the top of the IB3 HV rectifier tube (or whatever number it is) and see if you can draw a small arc, do not ground the screwdriver for this test and keep one hand in your pocket to avoid electrocution!!
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