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The capacitor that Apple soldered incorrectly at the factory (www.downtowndougbrown.com)
96 points by zdw 2 hours ago | hide | past | web | 22 comments | favorite





In the mid 80's I was the head of the CS student chapter. We ran the computer rooms for the science faculty. We hsd a room with about 20 Mac 128k. I do not know where Apple sourced their capacitors from, but these were not A-tier. A Mac going up in a puff of white smoke was a weekly occurence. We had a few in reserve just to cycle them in while they were out to Apple for repair.

P.S. still my favourite Mac of all time was the IIcx. That one coupled with the 'full page display' was a dream.


Well, today I learned to install one capacitor in reverse orientation on the PCB on a 34 year old computer...

Definitely starting Wednesday off productively.


I actually have an LC III in storage, so I might actually be able to make use of this article.

I think this will allow me to classify today as productive.


At least you made my Wednesday ;-)

Commodore had 3 capacitors mounted backwards on the A3640, the CPU board of the Amiga 4000 with 68040 processors: https://youtu.be/zhUpcBpJUzg?si=j6UFmIJzoC-UDS6u&t=945

Also mentioned here: https://amiga.resource.cx/exp/a3640


Classic Commodore Quality :P

They also had backwards caps on the CD32 and A4000


I wonder if there were any bootleg boards that copied the silkscreen mistake, but didn't use those 16V capacitors, and ended up catching fire.

Apple should be required to do a recall for these motherboards.

If they do a recall, it will say they should be discarded. Sony has a recall on all its trinitron tvs made before the end of 1990 like this:

https://www.sony.jp/products/overseas/contents/support/infor...


This shouldn't be allowed at all: if the product was bad all along, they should be required to fix it, and shouldn't be able to say "well, it's old, so you should just trash it", which means they don't suffer any penalty whatsoever.

I don't think that's a reasonable expectation in general, and certainly not in this case. The affected TVs were all at least 20 years old - that's well beyond the expected useful lifespan of even a modern TV, let alone an older model like these. Nor is it clear what Sony could reasonably have done to repair them; even by 2010, a lot of the parts used in CRT TVs were out of production and unavailable.

Maybe you're too young to remember, but people used to keep TVs for much longer periods before HDTV and flat panels came out.

Also, these TVs are apparently fire hazards. It doesn't matter that they're 20 years old (at the point of the "recall" in 2010).

I doubt the parts necessary to fix them were out of production; you can get parts for truly ancient electronics still. Things like capacitors don't become obsolete. The recall doesn't specify exactly which component is problematic, but says it's age-related, which usually points to capacitors.


This. I’ve known a TV that was in more or less daily use for over 30 years. Not sure why we stopped expecting that from electronics.

> that's well beyond the expected useful lifespan of even a modern TV, let alone an older model like these

A modern TV may have an expected lifespan of five years. TVs from several decades ago had lifespans of... several decades. Quality has plummeted in that market.


5 years? Is that really true? I’m currently using an LG from 2017 and cannot imagine needing to change it. I would be shocked if it stopped working.

Only one metric of 'quality' has plummeted.

A rock lasts billions of years, but its quality as a TV is rather questionable.


It is a legitimate business decision, to sell things that last less than 20 years. Fine, I think it is lame, but it is their choice.

But, we shouldn’t let companies get away with selling products that catch fire after working fine for 20 years.


They don't do recalls even on modern hardware. But soldering hacks are no longer possible, all parts are serialized.

Louis Rossmann made many videos on this.


What are you talking about? Capacitor technology hasn't changed substantially in decades, and it's just as possible to change caps with a soldering iron now as it was 20 years ago. I have no idea what you mean by "serialized".

not capacitors, but more advanced components, like the camera, have serial numbers embedded in them, and the serial number needs to match, otherwise it won't accept the component. Components off a stolen device are put on a list and won't work in admirer another phone, so stolen phones aren't even worth anything for parts, driving down the market for stolen phones.

For 1993 hardware?

Commodore struggled with same mistakes on negative rail in Audio section, but also somehow on highend expensive CPU board.

https://wiki.console5.com/wiki/Amiga_CD32 C408 C811 "original may be installed backwards! Verify orientation against cap map"

A4000 https://wordpress.hertell.nu/?p=1438 C443 C433 "notice that the 2 capacitors that originally on A4000 have the wrong polarity"

Much worse is Commodore A3640 68040 CPU board aimed at top of the line A3000 and A4000 http://amiga.serveftp.net/A3640_capacitor.html https://forum.amiga.org/index.php?topic=73570.0 C105 C106 C107 silkscreen wrong, early revisions build according to bad silkscreen.


Typical Amiga fanboyism and Apple envy, if a Mac does something they have to prove the Amiga outdid it. “Only one model with a reverse polarity capacitor? With Commodore it was a systematic issue!”

They were probably expecting these to fail a few months after the warranty expired.



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