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It could have very well taken out the regulator. About 20 years ago, I was given a 19" Sony from the same time period as yours and it had a shorted HOT. I didn't want to fool with it and I gave it to a friend. He found that the flyback was what took out the HOT and after replacing the flyback and HOT, the set went into shutdown; but, would stay on at lower line voltage. He determined that the combination audio output/voltage regulator IC was bad.
Out of all the sets that I've serviced (all brands), I've found these parts to be common failures. Sometimes, a HOT will blow on it's own; but, more times than not, something caused it to blow and based on my experience, I'd look at the flyback as being the cause.
When replacing the parts, try to stay away from NTE parts and go with the original part numbers, if you can find them.
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