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Hah, I take my previous comment back. Corrosion around the chip UH1 and UK2 upon looking at the bigger pictures looks really bad.  And there are a lot of exposed/bare traces.  

Possibly, depends on how bad the corrosion is.  When you say it turns on, does it boot? If so, you're in a good spot.  If not, then you might be able to fix.  The corrosion does not look to be too bad in the pictures, if traces are corroded, they might be fixable. It certainly needs to be recapped. 

That's great stuff you're making with those old macs. You came to the right place to keep them running and ask questions.  I'm happy to do whatever you might need in terms of help to keep those old macs in business :)

Wow, I'm amazed some older macs are still doing duty in CNC shops! So cool to see!  Now I understand the comments about dongles and PAC software. 

Make sure you have the jumper on for the ROM select..  This is exactly what happens when that jumper is missing.

Just like in life, drives die, and it is something you can't predict.  You can sometimes guess, but you never know exactly when. 

I do not see this posted elsewhere, so thought I would share.  Too rich for my blood, and current bid of $6k doesn't meet reserve.  This is a very respectable collection for sure. https://www.ebay.com/itm/AMAZING-Vintage-Apple-Computer-Museum-lot-Mac-Apple-II-Lisa-Mac-XL-RARE/333612411629?

I think I know why this IIci won't boot.  When you see it! https://www.ebay.com/itm/Apple-Macintosh-IIci-Computer-M5780-Includes-Hard-Drive-Does-not-power-on/124170269083

Sorry, pasted wrong video above, this is the repair video where the electrolytic look like tants. 

Someone did a good video on repairing their newton 100 (below), and the electrolytic look like tants.    Also good instructions on how to dissemble https://www.pda-soft.de/2x00_disassemble.html

I am pretty sure I figured out what the problem was. The old drive still booted so I was attempting to use the old system folder along with Rominator II and I think I caused a Mode32 conflict which resulted in drive corruption.  With the old ROM and a fresh OS install to 7.5.5 all seems pretty...

I had some progress - I have the motherboard recapped and soft power on/power off is all working.  The 40meg original HD still boots so transferred that to a SCSI2SD v5.1 and initially ran into corruption issues.  I thought maybe it was maybe an incompatibility, but it looks that I was hitting a...

HI, yes I have a V5.1 working in a Mac IIci.  On this same IIx using a V5.5 (external 25pin) it seems to work ok - however, it is mostly reading from the V5.5.  I also have a V6 working on a PowerMac 6112.   I'll check the firmware tonight. 

Hi, I have a SCSI2SD V5.1 and I'm not having a lot of luck getting it working with a Iix, has anyone done this successfully?  I can get partitions on it, install an OS, but eventually run into disk corruption issues when installing OS 7.5. 

LaPorta - Thanks for the encouragement :) I tested the traces for continuity and found that SW1 trace did not connect to L4. Fixing it on the backside looked like the easiest thing to do, so with that done, the system works as expected. Power on via keyboard and switch in the back.  Pictures...

Very nice showing of gear!  Welcome!  Why is the LC475 in german? 

This weekend I worked a bit on the system and finished recapping.  The system will not power on using the MB button or keyboard.  If I use a battery and short the pins on the PSU, it will turn on, chime and boot :)   Here it is booting, have the sound on for a treat.  First time it has booted...

@LaPorta I read quite a bit about this and spent some time on YouTube trying to figure out what might be best. Even one guy who said maybe you don't want to do it!  Anyway, instead of making my own mixture, I found that you could order a pre-made liquid of hydrogen peroxide with a reactive agent...

Today was all about Retrobrite.  See the before and after below.  I am still working on the MB, I have recapped, rel-flowed a few suspect chips, and it will not power on with the power button.  If I use the technique with a battery to force a power on, it will power on with a discord. I tried...

So I tried to power on the MB, no go.  However, a friend pointed out something about the RAM.  It looks like they used DIP ram chips instead of surface mount chips.  And I hadn't noticed at first, the ram is actually Apple Ram (or made for Apple).  When looking even closer, there are a lot of...