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The capacitor that Apple soldered incorrectly at the factory

downtowndougbrown.com

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Re: The capacitor that Apple soldered incorrectly at the factory

#181

Earlier quoted context omitted.

You're making a pretty awkward value judgement about what a "good" engineer is, but you're describing an unethical one with a bizword like "value engineering". I realize ethics are no longer understood by much of Western society because the culture teaches transactionality, worships trickle-down economics and greed, and hyperindividualism. > It isn't that. It's pressure at the shelf that does it. Consumers behavior s…

A good engineer is one that has a job, doesn't put their employer out of business, and produces work that fulfills the requirements they're given. Many people think there's some unethical conspiracy going on, and consumers actually want a product that lasts a long time, but companies are refusing to give it to them. But this is projection of individual preferences on to the market as a whole. Consumers want cheap shi…

A good engineer provides value to society. If they fulfill requirements that are bad for others then they are not good engineers.

I seems to me that there is also a social dynamic to things. If consumer grade products become a race to the bottom then it is going to become more difficult for regular people to purchase products which aren't low quality. There's also a degree to which society (e.g. in the form of government policy, cost of living adjustments, etc.) factors in differences in prices.

Re: The capacitor that Apple soldered incorrectly at the factory

#182

Earlier quoted context omitted.

Intentional planned consumption/obsolescence by design. This class of problem is where under-regulation and lack of standards benefits only sellers and cheats buyers. PS: Also, Amazon should be required to test all of the electronic, safety, and food products on its site such that they can prove safety and standards conformance.

> Intentional planned consumption/obsolescence No it isn't. It is simply optimization of price and the features/form-factor that many buyers have demanded. If anything, the lifespan of a ~$1.50 household LED bulb is quite incredible. I'm not sure exactly how anyone would be able to increase the lifespan at that price point and keep the traditional Edison form factor. > Amazon should be required to test all [..] produ…

The problem is that the manufacturers lie and say that the LED bulbs will last for many years when they don't.

Re: The capacitor that Apple soldered incorrectly at the factory

#183

Earlier quoted context omitted.

Intentional planned consumption/obsolescence by design. This class of problem is where under-regulation and lack of standards benefits only sellers and cheats buyers. PS: Also, Amazon should be required to test all of the electronic, safety, and food products on its site such that they can prove safety and standards conformance.

I am assuming you are an ee (like myself)...I have never designed a product with a built in expiration, nor have I ever seen any app notes or write ups on the engineering of it - something engineers love to do. What I have seen done is cheaping out on parts in order to get the price as low as possible, because customers shop primarily on price. Not to lash out, but it kind of hits a nerve for me, because people think…

Not LED light bulbs specifically, but...

"The Phoebus cartel engineered a shorter-lived lightbulb and gave birth to planned obsolescence"

https://spectrum.ieee.org/the-great-lightbulb-conspiracy

Re: The capacitor that Apple soldered incorrectly at the factory

#184

Earlier quoted context omitted.

> Intentional planned consumption/obsolescence No it isn't. It is simply optimization of price and the features/form-factor that many buyers have demanded. If anything, the lifespan of a ~$1.50 household LED bulb is quite incredible. I'm not sure exactly how anyone would be able to increase the lifespan at that price point and keep the traditional Edison form factor. > Amazon should be required to test all [..] produ…

The problem is that the manufacturers lie and say that the LED bulbs will last for many years when they don't.

The claim they put on the box is typically true, but based on some damn modest usage. (e.g. 3 hours per day in ideal environmental conditions) And of course, a mean-time-to-failure figure to someone with one bulb built with minimal QA is just a dice-roll when faced with the bathtub curve of product failures.

Re: The capacitor that Apple soldered incorrectly at the factory

#185

Earlier quoted context omitted.

> Intentional planned consumption/obsolescence No it isn't. It is simply optimization of price and the features/form-factor that many buyers have demanded. If anything, the lifespan of a ~$1.50 household LED bulb is quite incredible. I'm not sure exactly how anyone would be able to increase the lifespan at that price point and keep the traditional Edison form factor. > Amazon should be required to test all [..] produ…

> If anything, the lifespan of a ~$1.50 household LED bulb is quite incredible. I'm not sure exactly how anyone would be able to increase the lifespan at that price point and keep the traditional Edison form factor. I don't think I've had any last more than 5 years. If you bought a cutting edge LED bulb back in 2002 or so, those had a life expectancy of over 60 years, and the build quality was such that you could rea…

Yeah I would hope those bulbs were built pretty well, they were crazy expensive... expensive enough that they wouldn't be competitive in lifetime-per-dollar against today's crappiest bulbs even if they lasted a person's entire lifetime.

> I don't think I've had any last more than 5 years.

Do you shut them off every 3 hours? That's probably what the estimate on the box is based on. Run the same bulb half the day and you'll only get 2.5 years out of it.

> There are plenty of teardowns on YT showing how poorly even major brand name LED bulbs are put together.

I've seen them. And dissected my own. Still, at the price that modern LED bulbs are being made, I'm surprised they're built as well as they are. Brand name Sylvania bulbs are $0.79/ea in a bulk Amazon right now.

Re: The capacitor that Apple soldered incorrectly at the factory

#186
post #141

Didn’t this also happen on some Asus motherboards a couple years ago?

That one was Asus ROG Maximus Z690 Hero ~2years ago.

Sorry to hijack the thread, I couldn't directly reply to https://news.ycombinator.com/item?id=42092845 .

The reason to not (just) use optical flow is that it isn't absolute. If you pattern your surface correctly, you can ensure that every few by few pixel region on a QR code like bitmaps surface is unique, and thus can be decoded into an absolute position. Basically a 2D absolute optical encoder fast enough to be part of a motor control loop.

Re: The capacitor that Apple soldered incorrectly at the factory

#187

Earlier quoted context omitted.

A good engineer is one that has a job, doesn't put their employer out of business, and produces work that fulfills the requirements they're given. Many people think there's some unethical conspiracy going on, and consumers actually want a product that lasts a long time, but companies are refusing to give it to them. But this is projection of individual preferences on to the market as a whole. Consumers want cheap shi…

A good engineer provides value to society. If they fulfill requirements that are bad for others then they are not good engineers. I seems to me that there is also a social dynamic to things. If consumer grade products become a race to the bottom then it is going to become more difficult for regular people to purchase products which aren't low quality. There's also a degree to which society (e.g. in the form of govern…

The fact that poor people can now afford to own some household appliances isn't a huge value to society?

It completely changed the way our societies operate. I think it is a good thing that people have the option to buy crappy washing machines, rather than being forced to use the washboard and bucket my grandmother used. Yeah, they sometimes do develop a bad belt, or the timer mechanism might fail. But it beats being unwillingly forced into homemaking as a career.

The world only has so much wealth to go around, and that isn't the moral quandary of the engineer picking an item on a BOM on Tuesday morning to fix. If anything, squeezing a few more pennies out of that BOM is going to lift some people at the fringes out of poverty. At the opposite end of the product value equation, every unused and functional component in every product that is no longer in service, is wealth that is wasted that could have been spent elsewhere.

Re: The capacitor that Apple soldered incorrectly at the factory

#188

Earlier quoted context omitted.

Electrolytic capacitors are kinda like lead-acid batteries in that they are polarized through manufacturing processes. A voltage is applied in the factory to anodize the anode with a thin oxide layer. For fun, I think it would be possible to buy a quality low voltage cap and reverse the polarity of it in-situ which would remove the anodization from the new cathode and deposit a new layer on the new anode (former cath…

> Any much older than that need to be checked out-of-circuit for ESR and then capacitance And that's a very time consuming and somewhat risky operation on an old machine you want to keep running. Some old PCBs are quite fragile. I wish there was a way to test capacitors without removing them.

You can test ESR in-circuit, with caveats. Here's a good thread from EEVblog [1].

[1] https://www.eevblog.com/forum/beginners/is-there-any-way-to-...

Re: The capacitor that Apple soldered incorrectly at the factory

#189
post #173
post #171

Earlier quoted context omitted.

Common mode noise filtering is either going to be purely inductive or need a Y-cap. No other way around it.

One can build lots of things out of inductors and capacitors. I bet it’s possible and even fairly straightforward to built a little network to allow high frequencies to pass from output to the two line inputs with low impedance but that has extremely high impedance at 50 and 60 Hz (and maybe even at the first few harmonics). It would add components, cost and volume. I bet this could be done at the output side, too. A…

The capacitor has to see the common mode voltage. Where do you put the other end?

Re: The capacitor that Apple soldered incorrectly at the factory

#190

Earlier quoted context omitted.

> Older computers usually guzzle power, especially if you look at the absolutely awful Pentium4 systems. Even many Pentium 4-based systems would idle around 30 watts and peak at a little over 100, which is on par with a lot of modern desktops, and there were lower and higher power systems both then and now. The top end Pentium 4 had a TDP of 115W vs. 170W for the current top end Ryzen 9000 and even worse for current…

>The top end Pentium 4 had a TDP of 115W vs. 170W for the current top end Ryzen 9000 and even worse for current Intel. You can't compare CPUs based on TDP; it's an almost entirely useless measurement. The only thing it's good for is making sure you have a sufficient heatsink and cooling system, because it tells you only the peak power consumption of the chip. No one runs their CPUs flat-out all the time unless it's s…

For most videos, the difference between 1080p and 4k ain't that large.

But for certain video games on a large screen, I can definitely tell the different between 1080p and 4k. Especially strategy games that present a lot of information.

Btw, as far as I can tell modern screens use significantly less power, especially per unit of area, than the CRTs of old; even if that CRT is still perfectly functional.

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