Any tips and pointers would be much appreciated, in terms of common ways to search for and exploit vulnerabilities, or the exploitation of other televisions. Alternatively, if this is an absolute fool's errand, and the whole thing is locked down tighter than Fort Knox, a firm warning that this is not a good thing to dick around with over a weekend would also be appreciated.
If you're going to hack on an OLD TV or microwave, please don't unless you know what you're doing. If you're still going to continue, at least unplug it for over 24+ hours before cracking it open. Those capacitors may still be charged and will not tickle.
If your microwave doesn’t turn on, it’s likely due to a $0.25 switch that has failed (use the stop or off button folks, the emergency stop on the door switch takes the full brunt of the magnetron)