So I'm pretty sure the ADB problem is related to one or maybe two tiny components on the underside of the board just behind the ADB port if moving from the edge of the board.  I th…

All this 3400c talk made me want to pull out mine, and it has its original battery. It is still holding a charge for over an hour of runtime. 

Mouser actually has the holders for just under $6 (534-1109) though they are backordered.  I think for the 3400c battery I'm going to go that route with these:  http://www.ebay.com…

I've cut out the board and made a note of where the wires came from.  There were 4x 26650 lithium cells.  As I can't tab or solder them myself and I don't think the holders I've fo…

Thanks. *)  Yes, it's back to booting for the most part.  Crashes with the card almost like clockwork > Sad Mac. 1)  Cardbus:  Yea I worded a lot of that unhelpfully I'm g…

Also, why the Disk Tools floppy?  Not that that is your problem now, but why not a fresh install of a full system?  NB that when you're installing a system from another machine, y…

raoulduke said: it's only when the Card's inserted that it freezes. Click to expand... So it's back to booting okay now, without the card? Could some weird PCMCIA …

[that read on my 3400; it's not Cardbus] Click to expand... The 3400 is Cardbus compliant:  it usually requires a one-wire mod to activate it, but someone may have already done…

raoulduke said: I should have put a question mark on superseding. It's a proposal-topic. It just seems like there's next to nothing on 3400 repairs. Click to expand... T…

There is a RAM card.  But it's only when the Card's inserted that it freezes.  Could some weird PCMCIA issue have screwed up the IDE bus?  [After the first Sad Mac, I subsequently …

The 5300c has a RAM Card in it? Open her up and press down on the cards to make sure they are properly seated. Then check your cabling. What OS is on the Card and on the HD and wh…

Weirdly appears to just be hard drive failure. It's my first sad mac. Sorry for the false alarm [or maybe not, I don't know]. The HD failure is possibly coupled with the 5300 ha…

Also I recapped my power board.  I find no indication it works better than the others.  I think there may be minor issues with the power boards but that mostly the power issues are…

Anything I can do? Was trying to format a CF card in a PCMCIA adapter [that read on my 3400; it's not Cardbus].  First time I inserted it, the machine either froze or restarted.  …

Interesting. You had no corrosion damage. So I got mine to move from gray screen to flashing image by dishwashing the board. Personally I think the culprit is a CMOS chip on the un…

Interesting thread. I have a 3400c/240 too sitting in the closet. never could solve the problem... here is the thread if of some interest : https://68kmla.org/forums/index.php?/t…

Do you have any idea how I'd find out where the ADB controller is.  The mouse works better but sometimes it doesn't work at all.  I'll let it sit overnight again but that's not a g…

I think you may be right.  [it's worth noting I had removed and replaced (i.e. reseated) everything way prior to this so if there's a connectivity issue it's deeper or more latent.…

Check the HD and trackpad ribbon, connector and reseat all.  You need to reseat both cables quite firmly and ensure the latch goes down properly.  The trackpad is just an ADB devic…

For documentation purposes, the issue with the disk icon not popping u,p when the screen and cursor would, was located in a CMOS chip. Now I'm having problems with the HD port an…

Still does not read the trackpad

Lol. Disregard. No disk at all with CD module, flashing disk with HD, it booted from floppy [wrong OS, hence message]. At some point it stopped displaying the flashing QM. I let…

Your point is very valid.  I lack patience, and it is a problem, particularly in an electronics-related respect.  In this case, I let the board sit overnight after a brief second w…

I admire you getting in elbows deep into fixing your Macs, but you just seem to be jumping the gun a little too early and doing all the things I'd consider a "last resort" first an…

The dishwasher seems to have killed my board. SadMike.