I think your reply shows that you are already very skilled.
Other comments mentioned replacing a diode -- I know what a diode is conceptually, but I have no idea how does it look in the appliance, where would I buy a new one or how to replace it.
Being as clueless as I am, my only option is to call a proffessional. Sometimes it is worth it -- I had a fan on my MacBook replaced for ~700 SEK which is a fraction of the price, but sometimes it's not. Our 1 y/o kitchen oven bought from IKEA started malfunctioning, so we called one of the repair centers they subcontract repairs to. They sent us an invoice by accident even though the oven was covered by a warranty and I couldn't believe my eyes. The cost of the new oven was IIRC ~5000 SEK (~500 USD), but the repair was over 4500 SEK, 3k for the replacement part (!?!) and 1500 for the repairman to come and do their job. I didn't know the cost upfront and I guess they wouldn't have told me an estimate without looking at the oven, at which point I would have to pay the labour cost anyway..
So sadly, given the cost, I would have probably opted for just buying a new item if the faulty one is out of warranty..
Hmm, I am just confident in my ability to follow instructions. I am certainly highly skilled in electronics, but repairing stuff isn't necessarily limited to that.
With good instructions, I can set out to repair mechanical parts as well (replace parts of an engine for instance), high-voltage devices, masonry, or other stuff I have never done before.
A good manual can make the whole difference between a successful repair, dealing a finishing blow to a product, or endangering yourself/others.
Making repairs easier probably makes them cheaper as well (less skilled employees can attempt them, it takes less time and is much more enjoyable). I know I would charge less.
Of course, the product has to be designed to make repairs possible, otherwise it requires a whole other level of skill (unglue parts, precisely cut where you need to).
And lastly, you can only go as far as your equipment will allow you. Sometimes all you need is a (included) screwdriver, but not everyone has a milling machine handy (though that would be an interesting use-case for fablabs).
Spare parts are an example of monopoly pricing - the original manufacturer is usually the only source of parts for any given product, so they can charge what they want (usually as much as possible, such that it's only just worth it to do any given repair vs. replacing the whole thing)
If products can be repaired easily, even if it is not worth paying to repair it or one is not skilled enough to repair it, there might still be a market for broken down items as people with skills might buy them, fix them and use or resell them. It beats throwing stuff in the trash.
Other comments mentioned replacing a diode -- I know what a diode is conceptually, but I have no idea how does it look in the appliance, where would I buy a new one or how to replace it.
Being as clueless as I am, my only option is to call a proffessional. Sometimes it is worth it -- I had a fan on my MacBook replaced for ~700 SEK which is a fraction of the price, but sometimes it's not. Our 1 y/o kitchen oven bought from IKEA started malfunctioning, so we called one of the repair centers they subcontract repairs to. They sent us an invoice by accident even though the oven was covered by a warranty and I couldn't believe my eyes. The cost of the new oven was IIRC ~5000 SEK (~500 USD), but the repair was over 4500 SEK, 3k for the replacement part (!?!) and 1500 for the repairman to come and do their job. I didn't know the cost upfront and I guess they wouldn't have told me an estimate without looking at the oven, at which point I would have to pay the labour cost anyway..
So sadly, given the cost, I would have probably opted for just buying a new item if the faulty one is out of warranty..