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It powers up with a power adapter but still not with the battery. It’s probably something simple on that DC-in board but haven’t been able to figure it out yet. Anyway, this is good enough for now :)

I replaced the ribbon cable with one that's a touch longer. The TechStep still does not display anything on screen and still doesn't show voltage at the voltage regulator. Back to trying to following the path from the battery more closely.

Maybe focus on the feedback circuit of the analog board. Consider changing the optocoupler and/or the diodes near it.

I came across a manual for the Macintosh Portrait Display, and it conveniently included a pinout of its quite hard to find video cable. Here it is in case you need to build your own.

The power jack is center negative. I expected something to be blown from someone connecting a more typical center positive adapter. I don’t think there’s any protection against that. hopefully all this needs is to have these wires reconnected. @splorp Have you opened yours up yet?

While double-checking the connections from the battery and barrel, I noticed the ribbon cable was a bit too wiggly. After pulling lightly I found the battery positive connection was broken. Hopefully reattaching that will fix the issue.

After years of searching, I've finally scored a TechStep. Unfortunately it shows no power with a good 9V battery. I haven't ordered a power supply yet, but suspect it'll produce the same result. Nothing is scorched and so far all of the joints I've checked look okay. However, 9V is not making...

A friend recently gave these to me as a thank you for something. I don't know the whole story, but it sounds like they were possibly a gift to people who worked on the first gen iPod mini. Regardless, they're now my favorite quirky accessory.

I'm restoring a couple of original Disk II drives which have rusty bottom screws and melted feet. I had a hard time finding documentation about their specs, so I'm posting this for anyone who needs the info in the future. The rubber feet are 3M SJ-5023-BLACK. They're 2cm square at their base...

The IWM or Integrated Woz Machine is the floppy controller IC. Perhaps check the solder joints or just give them all a reflow before giving up on this board.

Updated the description text to include the logic board part number. Changed C11 from 25V to 16V. Updated lead spacings to align with JDWs document. The mostly moved things by 0.5 to 1.0mm and added in lead spacings for the axial caps of the analog board. Added a column to note caps marked as...

Just for completeness, I noted the OEMs for each capacitor on this specific board in case that's interesting to anyone. I've noted 'Nippon Chemi-con' as marked, but I think they're now known as United Chemi-con.

Perhaps you need to update to 8.6 or 9 to get that drive working. How did you attempt to access it? Did you format it with Drive Setup? If it's formatted with a more modern file system it's not going to mount in 8.5. You can find QuickFTP on the Mac App Store. You'll need an ethernet cable and...

What are you plugging the USB stick into? I don't think they will work if plugged into the keyboard. The iMac has ethernet, so you could set up a simple FTP server on a modern Mac with something like QuickFTP and then download a client (Fetch/Transmit) from a site like Macintosh Garden. That...

Sounds like bad RAM as the error is indicating. You could try a diagnostic like TechTool Pro to get more confirmation. Otherwise if you have two chips you can try removing one and swap testing to figure out which has failed. If you have one chip, it's time to find a replacement.

This beauty is now working! Below is a table showing the final connections that I made when splicing the new cable in. I hope it helps someone in the future. Now on to rebuilding the speaker cables which should be a lot easier.

I recently got this lovely Packard Bell CRT monitor, but its VGA cable was cut by ewaste. I got another VGA cable to splice in, but the wire colors are different. Before I do the work, I was hoping someone here could let me know if I'm on the right track or not. Can someone here advise if the...

@MacEffects FYI on this thread since we were just chatting about the subject. It'd be nice to find a shop that specializes in plastic/paint spectrometry to sample something like a sealed-in-box accessory with no texture (like the inside of a mouse ball cover) that's likely to be exactly or close...

They already moved and it was just a few blocks down the street. They should be good for a while.

@Kai Robinson I've added this as a resource here.