Why do Some Monitors Fail if Driven at the Wrong Horizontal Frequency?
I think it *should* not have failed. It is the purpose of the deflection processor to guard that the line deflection never runs at a forbidden frequency. It is possible that such protection is not good enough, that when the PLL is not in lock it might generate a very irregular line drive. That can prove to be immediately fatal to a line transistor. All it takes is one line length that is too long, followed by a flyback pulse that is too high, and it’s all over. Second breakdown, terminal. Trying a too high line frequency is usually not harmful, generally your EHT will be too low and your deflection current amplitude too. The HOT might eventually die from overheating due to bad drive conditions, but otherwise any decent monitor should be able to withstand it. In the better cases it simply refuses to sync on an illegal frequency. • While increasing the frequency of the horizontal drive *all other factors being equal* should not result in HOT death, all other factors are not always equal.
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