The microwave stays charged after you unplug it

A short list, and the people here are united on it. Three separate conversations say that capacitors — the parts that store energy inside a device — in microwaves, old tube monitors and televisions, and heating and cooling units hold a charge that can kill even when the device is unplugged. The cautions rated high spell it out: two accounts say older televisions and arcade machines can hold that charge for months; one says a big one fully charged delivers a fatal shock; one says checking with a meter can take hours to show it drained; one adds that a tube set that falls on your feet after it has zapped you can implode. The contraindications name the same things eight times over, for the same reader — the beginner, the person without training — and add camera flashes, power supplies and large rechargeable cells. One account describes a capacitor big enough to spot-weld a screwdriver; another says a flat-screen monitor usually gives a nasty shock rather than a fatal one, and then corrects themselves in an edit to say flat screens can discharge too, though not with the force of a tube or a power supply, and that some devices do drain if left unplugged for a day — a comfort this page does not lean on, because the US safety commission says the shock risk in a microwave remains after it is disconnected, and because how to tell from outside whether yours has drained is a question the accounts left open. Two more hazards from the cautions, one each: the fluorescent backlight in an older flat screen contains mercury, so don’t break it; and a battery pack is a chemical hazard, not an electrical one — one account calls opening one a really stupid idea, and this page agrees. Now the thing this page refuses. People in these conversations asked for the steps to discharge a capacitor safely, and the accounts who answered disagreed with each other about the tools: one proposed a resistor of a particular value and was corrected by another who worked out it would dissipate many times its rating and burn out; one caution rated high says an ordinary light bulb will simply blow; one account explains that grounding the case does nothing, because the energy sits between the two leads inside the part and must be bled between them. That is a procedure people who know it argue about, and this page will not write it down for people who don’t. Two accounts raise the related worry that a repair video may skip the discharge step altogether; the answer they get is that newer videos tend to warn of the shock, and that you check the safety steps yourself rather than trust the edit. One exchange in these conversations, two accounts to one, is about the outdoor heating-and-cooling unit in particular: two say its capacitor is an easy, safe swap for a homeowner once the power is cut and paying a professional for it is a waste; the one, a heating-and-cooling professional, says a general guide leaves out exactly the safety knowledge that keeps a homeowner from a fire or a gas leak. Because this page refuses the discharge procedure, the outdoor unit stays on its list for the reader it is written for. If you cannot say what is inside the case before you open it, you are the reader every one of those cautions was written for, and the answer is a professional or the recycling centre.

Much else, according to the biggest theme in these conversations — eight separate conversations say online video tutorials are enough to diagnose and fix most common household and electronic faults, and that a professional is often unnecessary for simple ones. The examples the accounts give, across four conversations: a kitchen sink, a ceiling fan, a waste disposal, a washing machine, a car’s vents, an oil change and a cabin air filter, a laptop screen, a phone screen, a tablet — the last three, one account says, are within reach of a non-expert with patience and a way of keeping the tiny parts in order. Two conversations say that many dead televisions and dishwashers come down to one blown capacitor or one loose connection, fixable cheaply with basic tools — and one account adds the version this page prefers: if you cannot solder, swap the whole board for a replacement one rather than the single part, and only on a device that is out of warranty and already broken. One account says the low-voltage things and the small appliances are the safer place to start, especially when they are already dead. Then the argument, which the people here have properly. In one conversation five accounts say that with a video the ordinary household job is within anyone’s reach, and two say that some jobs — drywall, laying carpet — cost a novice more in time, mistakes and finish than a professional charges; the conversation’s own decider is the complexity of the job, what you already know, and the gap between the quote and the parts. In another, two accounts say repair is harder now than it was — glued cases, components too small to see, batteries sealed in — and two answer that ordinary people built these things and ordinary people can open them, that the gap is cultural rather than technical; two other conversations make the same point about the barrier being in the head. Two accounts answer the objection that repair is too dangerous for ordinary people with: only if you don’t understand what you’re doing. The craft that recurs across the accounts is not electrical at all — it is keeping track of the screws. The accounts have systems: an ice-cube tray, tape, an egg carton, condiment cups, a magnetic tray; two others photocopy the underside of the device and push each screw through the paper where it came from, or draw the layout on cardboard and punch holes. Two accounts against three argue carton versus template, and the decider is how many kinds of screw the device has; one caution says some laptop screws are too short to stand in cardboard; one account lost three of nearly eighty and lived. One account checks for a product recall before touching anything, because a recalled fault can mean a free replacement. And one account says the thing the money never captures: that fixing something with their hands is a real joy, and got them through a depression.

Call first. Two conversations say the same thing and two contraindications repeat it: if the device is under warranty, contact the maker’s customer service before you open it, because an internal repair can cost you the coverage. Beyond that the people here had questions they could not answer — people asked about the legal side of voiding a warranty by repairing, and the accounts had nothing — so this page adds what it verified, for the US only. One account says the ‘warranty void if removed’ stickers have no legal significance there, and the claim went unchallenged. That is right: in April 2018 the US Federal Trade Commission sent warning letters to six companies making cars, phones and game consoles, saying that under the Magnuson-Moss Warranty Act a company may not condition its warranty on your using its own brand of parts or service, and naming ‘warranty seal altered, defaced or removed’ language as an example of what it objected to; it repeated the warnings in 2024. What the law does not do is cover a fault you caused — a maker can still decline a repair for damage from an unauthorised one. Elsewhere the rules differ and this page has not checked them; this page will not guess at the legal side, which the accounts left open; the one plain point is that a device already out of warranty and already broken has nothing left to void. Two cautions on the maker’s paid extended plan, from one account each: it does not cover accidental damage like drops and spills, and it is built for newer purchases; one account prefers a renter’s or accidental-damage rider on their insurance instead. The sibling page on extended warranties carries that decision in full.

Usually, and the people here say to check before you assume it. Two conversations say to price the parts and your time against the professional’s quote before starting; one account puts the professional’s markup at diagnostic fee plus labour, well above the part. One account was corrected when they said their heating-and-cooling repair saved only the diagnostic fee — two others pointed out the quote would have added the part and the labour, so the saving was larger than they thought. One account says quotes can be inflated, a single part dressed up as a system overhaul; another was offered a new furnace by several companies for what turned out to be an ignitor, until one firm agreed to reach the part and fix it; and one caution says to verify what is actually needed — though how to verify a quote without doing the work yourself is a question the people here raised and did not answer. The other side of the ledger, from the cautions and one account: tools you don’t own, equipment to rent, materials you waste, all of which can eat the saving; a new capacitor that fixes nothing because the capacitor was a symptom; and, for a dishwasher that eats a part every few months, one account says stop repairing and replace. Two arguments, one small, one useful. One account each way on a big television: one fixed a flat screen for under a dollar, the other says a plasma can end in total loss and injury and is better sold for parts. Two accounts against one on cars: oil changes are easy and cheap to do yourself, says one side; the other says a shop can be cheaper for the oil itself and handles the used-oil disposal you would otherwise drive to the dump; one more exchange, one account each way, is about mess versus a coupon. Parts are the last hurdle. Two conversations say the retail stores still stock individual parts but keep them off the sales floor, so ask; one account says the old electronics chain has gone and the online distributors take days to ship, so a whole replacement board is often the faster buy; one account says the heating-and-cooling trade suppliers will not sell to homeowners for liability reasons, and this page thinks that is one of the few times the trade is right. Two conversations say the reward, when it works, is a device that lasts years longer — accounts in two conversations built working units out of dead ones.

The people here asked this question more than once and a general test never appeared — so this page gives you their list instead, and says so. Three separate conversations put it bluntly: repair pays only if you can judge your own skill honestly, because a job attempted past your knowledge costs more in damage than the professional would have. One conversation, three accounts to one, has the majority saying online guides are wonderful and a willing person can learn, and the one saying that in high-voltage or high-stakes work a novice’s mistake kills people — and the conversation’s own decider is the risk level of the job, a home lab against industrial electrical work, which is a different page and a different reader. The widest argument in these conversations runs across three conversations on each side — three accounts saying that with internet access the ordinary household repair is within anyone’s safe reach, four saying that many jobs need a licensed professional because of gas, mains electricity or liability, and that a failed attempt often leaves a hazard the professional must then clear up. The accounts’ own decider settles it for this page rather than a winner: the type of system — a mechanical clog or a simple swap on one side; gas, mains wiring and the parts that hold a charge on the other. That decider is the whole shape of this page. The gas cautions are the sharpest in these conversations: one account says a gas repair done without proper sealing and wiring knowledge can cause a building-wide evacuation, and two contraindications say not to touch gas valves, gas pipe or refrigerant without the training and the tools. Two cautions, one rated high, are about the guides themselves: one says that a chatbot can talk a mechanically unskilled person into a job they cannot finish safely, and one says online guides are sometimes simply wrong, which matters little for a hobby and a great deal for a heating system. One detail from the corrections is the kind of thing that separates the two readers: an account said all capacitors have a right way round and was corrected — ceramic ones don’t — but one caution rated high says a polarised part fitted backwards turns a device into a short-lived heater or a fire. If the video says a part has a plus side, it matters, and if you don’t know what a plus side is, that is your answer. The positive version, from one account: in parts of Europe there are Repair Cafés where volunteers fix things with you, which is the honest middle between a video and a bill. And one contraindication says it plainly for the beginner: if you are unsure what you are doing, do not.