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https://youtu.be/UakOH7gkr-A?t=8m31s  Just if anyone's interested in some amusement, you can watch the LC III crash in an absolute trainwreck manner here. :) I'd like to properly reflow the board in an oven to see if that helps but I'm worried about melting the connectors; anyone know how...

Yeah, I'd definitely like to do that in future. Mail order's expensive in Aus but if I get this board going strong, I'll totes spec it with some sweet longer-life caps. I may do this if further experimentation doesn't net me a solution. I just can't quite bring myself to give up yet. :p I did...

Good idea. It's disappointing because the board is /that/ close to working but I just can't get it. :p

Yeah, tried it with the FPU out. No improvement. I've put the FPU in my other LC III. Fairly confident it hasn't been upped to 33MHz. How would one check that? I'm not familiar with the mod. Yeah, that was my leading theory - I expected it to have some sort of pin-related problem rather then...

Which solder joints had bad cracking? Was this on the analog board?

Well, I reflowed the VLSI chip to no avail. Machine still crashes when it gets hot. I'll keep my eye out for one but I have a feeling this LC III is a parts machine only now. Disappointing. 

Anyone know much about this? All I can find is that it apparently connected to an external 5.25" drive and could be used to transfer data off of 360K PC disks with special software. I only have the parts internal to the SE, I don't have any external drive or any software, not sure if I can do...

I beat the HDD back into shape, anyway. It's one I've had open before so I wasn't surprised at its unreliability. 

I absolutely can't argue with you there. If I can get the machine to working, I'll go back and swap those out. I just wanna see if I can get it going, otherwise I won't bother spending the time and money to get some decent caps in. Being out in Australia you gotta mail order if you want anything...

Such a cool find. I did a tear down on one of those Mac II 5.25" HDDs. Huge, and they get so hot. It wasn't working, so no harm taking it apart. When we opened it and powered it up the head arm freaked out so much it snapped one of the heads off. Hilarious. Unfortunately that was the only bit I...

Pictures of my LC III recap job.  Through judicious use of freeze spray I've pinpointed the problem to the large "VLSI" chip in the centre of the board - labelled 343S1065 - apparently it's the "Senora" chip, responsible for memory, I/O, audio and video. I don't have a replacement so I'm just...

I successfully hot swapped my ADB keyboard and mouse between my Macintosh II and LC III today. It was great! Then the Mac IIs hard drive died. So all in all, a total fail of a day but at least ADB hot swapping worked!

Loved the memes. Thanks for the experience share guys, particularly uniserver. If I can get all my Macs operating I should have some fun hotswapping ADB without a care in the world. :D

Cheers for the tips, I'll open it up and give it a good service. Yeah, plugged into my 800K SE. Thought it was cool that it could detect an 800K disk in a 400K drive and avoid you inadvertently formatting it.

I'll throw some up a bit later, sure. It's not super pretty, I used standard through hole electrolytics and tantalums. I noticed mine had that backwards silkscreening on the -5V filter cap. I've thrown the PSU on the scope and it's fairly stable now, beyond the usual noise expected on the 12V...

I have a problem with a 400k external Apple drive. I can put a disk in and gently push it down to seat properly (drive obviously needs a clean), the drive will read the disk, and then eject. The disk still shows up on the desktop and I can load files (asks me to reinsert) and once the file is...

Thanks all. I recapped the logic board and most of the PSU which made the machine a fair bit more stable. Still crashing fairly often when ejecting floppies - reckon I gotta go back into the TDK power supply and swap out the last few 1000uF caps I didn't have the parts to replace.

Thanks for your responses. It matches a lot of my research thus far - you're not supposed to do it but sometimes it works. I'm either gonna go and buy another 5 keyboards and 6 mice or I'll see if I can figure what aspect of the hotswapping causes problems/damage and maybe I can cobble something...

I apologise if this is in the wrong subforum but I couldn't find a better one to post it in.  Is ADB hotswappable for keyboards and mice? It's just I have something I need to do with 8 Macs at once but I only have 3 keyboards and two mice and so need to swap them from Mac to Mac while they're...

Hi gang. So I've been working with an LC III that's absolutely driving me up the wall. When I got it from eBay, I plugged it all in and it did nothing. Black screen. No sound. Left it for 10 minutes then suddenly it gave the startup sound and booted! I browsed around System 7 on the machine...