"Am I the first person to discover this?" is a tricky question when it comes to classic Macs, some of the most pored-over devices and boards on the planet. But there's a lot to suggest that user paul.gaastra, on the 68kMLA vintage Mac forum, has been right for more than a decade: One of the capacitors on the Apple mid-'90s Mac LC III was installed backward due to faulty silkscreen printing on the board.

It seems unlikely that Apple will issue a factory recall for the LC III —or the related LC III+, or Performa models 450, 460, 466, or 467 with the same board design. The "pizza box" models, sold from 1993–1996, came with a standard 90-day warranty , and most of them probably ran without issue. It's when people try to fix up these boards and replace the capacitors, in what is generally a good practice (re-capping), that they run into trouble.

The Macintosh LC III, forerunner to a bunch of computers with a single misaligned capacitor. Credit: Akbkuku / Wikimedia Commons

Doug Brown took part in the original 2013 forum discussion , and has seen it pop up elsewhere . Now, having "bought a Performa 450 complete with its original leak capacitors," he can double-check Apple's board layout 30 years later and detail it all in a blog post (seen originally at the Adafruit blog ). He confirms what a bunch of multimeter-wielding types long suspected: Apple put the plus where the minus should be.

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"Am I the first person to discover this?" is a tricky question when it comes to classic Macs, some of the most pored-over devices and boards on the planet. But there's a lot to suggest that user paul.gaastra, on the 68kMLA vintage Mac forum, has been right for more than a decade: One of the capacitors on the Apple mid-'90s Mac LC III was installed backward due to faulty silkscreen printing on the board.

It seems unlikely that Apple will issue a factory recall for the LC III —or the related LC III+, or Performa models 450, 460, 466, or 467 with the same board design. The "pizza box" models, sold from 1993–1996, came with a standard 90-day warranty , and most of them probably ran without issue. It's when people try to fix up these boards and replace the capacitors, in what is generally a good practice (re-capping), that they run into trouble.

The Macintosh LC III, forerunner to a bunch of computers with a single misaligned capacitor. Credit: Akbkuku / Wikimedia Commons

Doug Brown took part in the original 2013 forum discussion , and has seen it pop up elsewhere . Now, having "bought a Performa 450 complete with its original leak capacitors," he can double-check Apple's board layout 30 years later and detail it all in a blog post (seen originally at the Adafruit blog ). He confirms what a bunch of multimeter-wielding types long suspected: Apple put the plus where the minus should be.

Read full article

Comments

"Am I the first person to discover this?" is a tricky question when it comes to classic Macs, some of the most pored-over devices and boards on the planet. But there's a lot to suggest that user paul.gaastra, on the 68kMLA vintage Mac forum, has been right for more than a decade: One of the capacitors on the Apple mid-'90s Mac LC III was installed backward due to faulty silkscreen printing on the board.

It seems unlikely that Apple will issue a factory recall for the LC III —or the related LC III+, or Performa models 450, 460, 466, or 467 with the same board design. The "pizza box" models, sold from 1993–1996, came with a standard 90-day warranty , and most of them probably ran without issue. It's when people try to fix up these boards and replace the capacitors, in what is generally a good practice (re-capping), that they run into trouble.

The Macintosh LC III, forerunner to a bunch of computers with a single misaligned capacitor. Credit: Akbkuku / Wikimedia Commons

Doug Brown took part in the original 2013 forum discussion , and has seen it pop up elsewhere . Now, having "bought a Performa 450 complete with its original leak capacitors," he can double-check Apple's board layout 30 years later and detail it all in a blog post (seen originally at the Adafruit blog ). He confirms what a bunch of multimeter-wielding types long suspected: Apple put the plus where the minus should be.

Read full article

Comments