I found a component designated RY8015 which I don't recognize, shown on the photo below on an LCD TV PCB (the bulb-like part next to a green radial varistor).
What is it called? What is its design function?
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It is a discharge tube, possibly neon filled.... Normally it remains as open circuit, but if some part of the circuit received or generated higher than nominal voltage, the discharge tube fires and the resultant current will serve as the input for the detection circuit so that the abnormal condition can corrected.