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Yep, the micro is bad. Jump the relay and see if the HV comes up. It won't do much else, since the micro IC must be working in order for the tuner and the control circuits to operate. If the HV does not come up, you likely have other problems that could lead to a bad jungle IC, defective horizontal driver circuit components, defective power supply components, bad parts in the HOT area, or any combination of the above. Horizontal drive comes out of the jungle IC, to the horizontal driver stage, to the horizontal output transistor, and then to the flyback. A loss of horizontal drive anywhere in this chain means no HV.
If you get HV, you can feel a little better about changing the micro IC. However, I wouldn't be surprised if the tuner is toast and there could still be other damage to the set. Lightning is funny stuff that can do as little as blow the fuse and do as much a cook (literally) the chassis. I've had lightning damaged sets where it would be one part after another. Back in the day, it was usually worth the effort because a 27" TV was actually worth something. Now, I probably wouldn't go any further than the power supply before I bailed on it.
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