Hi fishnwich
If the landing gear "stops' and blows the fuse at the same time, and it happens when retracting the gear, you may be retracting too far. Many people have put markings on the jacks so they know when to let go of the switch.
On the TV lift mechanism, if you can see the gears that are making the noise, I'd check to see if they are engaged reasonably well. If slightly too far apart, they could be slipping, making the kind of noise you describe.
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