FX201P keyboard PCBs are vulnerable to battery leakage. I have one that is beyond repair, so I have a go at a replacement.
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https://www.youtube.com/watch?v=yV428JnylKI
A broken Casio PRO-101 came in for repair and was eventually repaired with a microcontroller. Extra features were added so that investigation of the internal data could be done.
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https://www.youtube.com/watch?v=Xrsssl8Ui9I
I made a set of four Beaufort Ink pen kits and a box. This is the making of the pens. One fountain pen, one ballpoint, one roller ball and one pencil. Nice kits
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https://www.youtube.com/watch?v=SsyCLCZ5dfM
The recreation has a small http server that runs on its own hot spot. various bits of information can be accessed and adjusted, making for faster debug.
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https://www.youtube.com/watch?v=kx9QJWdtKyE
It's broken so I take it apart and decap the ICs.
Die shots here:
https://blackrockdieshots.blogspot.com/2019/01/electronika-mk-33-theres-two-ics-in.html
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https://www.youtube.com/watch?v=99LCIoGy7OY
I have a go at removing motorcycle brake pistons from a six piston Kawasaki ZX6R caliper (or two).
One tool is a plier type arrangement, the other is a puller with slide hammer.
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https://www.youtube.com/watch?v=tO-gRQDYR5s
Using a wire brush, I had a go at taking the paint off the outside of a can. It worked quite well, but the gcode wasn't close enough to remove between the strips.
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https://www.youtube.com/watch?v=WIx4dYaHgI8