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A bit late, but I realized my recently published project might be exactly what you need: https://tinkerdifferent.com/threads/mac-portable-battery-charger-tray.2878/ Maybe that helps, at least as a reference!

Online, you can find a lot of discussions related to what power brick to use with Macintosh Portable (the original is M5136 7.5V 1.5A), if it has to be exactly 1.5A or can be more and if it’s worth recapping the power supplies. I decided to at least somehow help in those discussions with...

Hello, I would like to share my project that is long overdue for publishing here - MacTwister, a fairly universal Twisted Pair breakout board for a variety of SE and SE/30 network cards. It’s about the small PCB that you screw to the computer chassis that contains an external connector. I was...

I happen to own three Macintosh Portables and I was looking for a way to charge their batteries every now and then, without unpacking the computers from their safe storage. In short, I needed an external charger for Mac Portable batteries. Today, I would like to share my design of a 3d-printed...

https://68kmla.org/bb/index.php?threads/psi-cards-for-macintosh-portable.27787/ maybe this thread on 68kmla can be helpful for you, it has a vague description what the switches are for

Maybe one more hint: In my view, it's generally better to get a real "closet-find" find Portable that was untouched for years (provided that the 9v battery didn't leak) than something that already got "molested" by someone connecting it to power with a recap or trying to recap it without SMD...

On the other hand, it's probably good if sellers don't try too hard to run those systems with a dead battery and old caps. Particularly M5120 with a problematic hybrid can simply fry logic including the Portable-specific chips (PMGR being the good candidate that is fried by >6V on the A/D line)...

I'll try to share my experience with 3 Portables I own - one backlit (M5126) and two non-backlit (M5120). This is a rare problem but it occurs. I have one non-backlit portable with a slight tunnel vision problem. I also have a portable that has a dead line on the LCD so those might pop up as...

Sure, I see your points and I agree. Didn't want to start any big belief discussion - it's important that everyone finds a method that is reliable and safe (y)

I beg to differ - from my side this is by far the safest method with the risk of overheating the board. I replaced literally 100s of SMD caps in the audio equipment, 5 SE30s (pretty badly leaking), 3 Portables and 2 Classic IIs without a single ripped pad. On the other hand, pads often looked...