NotTaR of Television Sets : Flashovers inside the CRT               
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Flashovers inside the CRT

Due to sharp edges on the electron gun electrodes, impurities, and other manufacturing defects, there can be occasional arcing internal to the CRT. Properly designed HV, deflection, and power supply circuits can deal with these without failing but not all monitors are designed well.

There is nothing you can do about flashovers assuming your HV is not excessive (see the section: Excessive high voltage. If these persist and/or become more frequent, a new CRT or new TV will be needed.