Re: vertical output stage

Can we assume you were not trying to operate the tv set when it
supposedly failed?
The tv would had to have been turned on for a vertical circuit failure
as the voltages to it would normally be off when the tv is off.

Assuming that the vertical deflection is the only failure in the set,
it is way too far removed from the power supply to have failed from a
brown out.

Ac line - Main tv power supply regulator - Deflection/HV circuit -
Flyback derived secodary voltages - vertical circuit.

You should be able to see why if there was zero damage along the way
that the vertical circuit could not have been caused from a simple
brown out condition. If the tv has a typical SMPS power supply, then
it would have been able to operate normally with the ac line voltage
all the way down to 90 volts ac with no damage.

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