Asklemmy

Anything connected to your garage door.

That spring will fucking kill you.

I too was going to say microwave before reading the post body. Honestly though anything with a large capacitor, I can't give you examples unfortunately because I study physics not electrical engineering but some of those fat fucking capacitors will fry you and they hold their charge.

I was actually going to say microwaves, but specifically the thing where people use the parts to make those things where you can burn fractals into wood. They look super cool but apparently if you brush up against the wrong component your heart just stops.

Batteries

Old arcade machines. Giant capacitors + little knowledge on the subject = a very bad time.

As with anything it can be done safely if you know how. People still play those and they obviously need repairs/maintenance sometimes.

Holy shit, how has no one mentioned rechargable batteries?

Lithium Ion batteries, commonly used in phones and the like, rapidly catches fire and emits acidic smoke that will melt your lungs when the battery is punctured.

Anything with large capacitors?

• Laser / LED printers can blind you and may have larger capacitors.
• Old CRT style TVs / Monitors can get you if not discharged correctly.

Desktop computer power supplies. Don't open them.

DO NOT backfeed your house's electricity with a generator when your electricity gets shut down. You might electrocute someone working on those lines.

Old CRT monitors. Particularly if they've been recently unplugged. There's a cable in there my old teacher used to call "the superman cable".

I'll expand the microwave to anything that can carry a large electrical charge without you really knowing. I had a UPC that started acting weird, that was one I just sent right back to the manufacturer. I'll swap out batteries, but I'm not cracking open something with that much potential energy stored in it without me fully understanding everything about it - and unless I helped build the thing I do not know enough about it.

Ok firstly.

Never, work on anything that is still connected to a power supply.

This includes any stored energy. Isolate it first. Gravitational, electrical, pneumatic, hydraulic and chemical (if possible).

Don't fuck with stored energy.

Secondly.

Learn how to test if things are live, or have any stored energy.

Thirdly.

Once you KNOW you are safe. Go hard, learn all you can.

You can harvest the transformers for a couple junk microwaves to make an arc welder.

If you aren't experienced then pretty much all power supplies, battery backups, and motors should be left to someone else.

I saw someone lose a finger (later reattached) to a washing machine with a jammed tub. It was plugged in and on when they reached underneath it and yanked the belt, their sleeve ducked their hand into the drive wheel.

That said, if it fits your personality it can be both fun and satisfying to learn how to fix stuff. I try to teach anyone who's interested and asks. Except LG washing machines, those things can fuck right off.

If you're gonna take a washing machine apart and you cut all the wires, make sure you cut the main electrical plug off as well or your dumbass son (me) will plug it in and electrocute himself with it.

This very much depends on your level of skill, experience and awareness of the dunning-kruger effect.

This whole thread is making me anxious

Microwave

Air conditioner. I melted a screwdriver.

CRT TVs.

If it had warnings about not opening it, or not containing user serviceable parts, don’t fuck with it.

I had a problem with the control panel in my Panasonic microwave and was able to fix it pretty easily. Everything I needed to get to was inside the right front of the microwave; the control pad membrane and the sticker that goes on the front of it.