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I haven’t seen this before - a non-backlit Portable where the whole display dims perfectly evenly to black in about 5-10 minutes, then recovers from black to normal when powered off for about the same length of time. In that respect (the recovery), it seems the same as Tunnel Vision, except...

I was having disk drive problems with this backlit Portable that I’ve finally solved - the HDSEL trace was broken between the 6522 VIA pin 16 and 74AC244 latch pin 2. Capacitor leakage was the original cause. While disassembling and reassembling a dozen times during this repair, and around the...

Hello all, I’ve searched far and wide but not found anyone with what I’m seeing, nor have I ever seen it on other Macs before… This particular Macintosh (that I was using to test a monitor) has a green-tinged menu bar, as you can see in the photo. I suppose you could say it’s yellow. I tried...

This logic board is clean and tidy (unlike some others I deal with that have had battery leakage or damp storage…) and yet unfortunately, it displays the vertical bars typical of a ROM fault. I’ve swapped the ROMs and the RAM with a working logic board, to determine that they are OK. Could you...

I have a 500-series power supply that worked beautifully after a re-cap - then after a week or two, it went pop. It seemed a MOSFET had shorted - and then a spark jumped from that to the transformer leg, eroding a PCB track. But actually, the MOSFET tested fine on removal. The problem appears to...

Imitating the good-news post about the Powerbook 100, I couldn’t resist sharing a happy post about my 520 which arrived a week ago. I’d bought a power adapter previously - which was dead - but recapping it brought it to life. The 520 came with two batteries both showing the usual corrosion; the...

Ok, so obviously the answer is neither, but I’m just about at my wit’s end :) Macintosh Classic. The analog board had the usual leaked caps, leaky diodes, faulty optocoupler, etc. so the wobbling checkerboard was fixed by getting the voltages right - a happy bong, and all good. But that was a...

Hello; this is an odd way to seek out a ‘pen friend’, but here goes… I bought three PowerBooks from three eBay sellers in the USA - two 520c and one 540c. I live in New Zealand, so I had the packages sent to the NZPost freight forwarding facility in Portland, OR. They won’t ship them to me...