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Neat! The glimpse of the logic board does look like it has DIMM slots, is PCI architecture. Will be interesting see if there are any special markings on the board. Also interesting, the Ethernet connector is AAUI. I guess they made a Communications Slot II AUI card, never seen one of those.

And success!!!

Trace fixed…

OMG! I feel like I've been all over the board and somehow missed this! There are a bunch of other glancing nicks I've checked out exposed copper and not found continuity breaks but this is most definitely a break! THANK YOU!

Thanks, I appreciate the help!

The screen does nothing, the fan and front power light come on with ADB keyboard soft-power key press. Prior to my recapping and cleaning I was also getting a gray screen with square corners, no mouse icon or any icon. I'd be overjoyed if I could get to a blinking question mark. Will try...

I ordered this from eBay: https://www.ebay.com/itm/292164285410?hash=item44065933e2:g:sl4AAOSwi8VZUXse As I've yet to use it, I can't comment on how it works but the seller says the right things and has 100% positive feedback...

That was easier than I thought. ...but all back together and no change. Holding Command-Option- P-R right after soft-power on for a good minute doesn't seem to have any affect. sigh.

...yeah, but first I need to figure out to get that 4 sided chip back. Unlike the egret where I've done drag soldering across the legs this guy's legs go under the chip, not sure drag soldering will work the same. Also thinking about tinning the pads, putting the chip in place and using the hot...

The chips look pretty darn clean. Cleaning just the same. I actually hadn’t thought to try PRAM reset as i didn’t think I was getting far enough with boot for that to apply.

Just these:

Can you point me to what I'd order for replacements? If it was the SCSI chip I would think I'd get video, just not be able to boot a SCSI device? Still I'm looking over the board again under the microscope...

Remove L1 and L2, clean under them, and resolder?

I have a LC 550 logic board that I'm trying to get working and would appreciate any thoughts and/or advice. It came to me looking pretty good, maybe some signs of leaking capacitors but no obvious signs of trace damage. I did test it prior to re-capping in a known working LC575 chassis: On...

NASA, Macintosh IIfx, Space Shuttle flight simulations… Boring! ….Now let me tell you about the time I played Oregon Trail on a Macintosh LC in a middle school computer lab, so exciting. 😜 Kidding aside I want hear more too!!!

The original AirPort card you have should be able to work with any Wi-Fi access point that supports 802.11b. I‘m pretty sure it’s possible to configure newer Airports to only support 802.11g/n/ac which would break older “b” only cards like the original AirPort card. I believe it’s also possible...

Aren’t ”1.5” volt nimh rechargeable batteries really outputting ~1.2 to 1.3 volts? 6.2 total output could mean each cell is outputting 1.24v http://www.stefanv.com/electronics/using_nimh.html

Sonic Systems? Can you run Tattletech and see what it reports about the card?

I pretty much only browse the site using “What’s new - Latest activity“. the downside with that approach is the many ”like” posts that for the most part aren’t interesting when my goal is discovering what topics are actively being discussed.

No VRAM slot …or chips on the logic board? I wonder if this LC prototype used main memory for video like the IIci/IIsi?