Search results

Hmm. I’ll have to check on that. Would it be in the cluster where the hybrid chip usually is?

Thanks for the reply. I tried varying the power supply down to 6.6V, and it says the battery is full at every voltage. At around 6.6-6.5V, heavy HD activity will freak the system out, but it’ll still run if I lower it from 6.8 down to 6.5 after I boot.

Hello all, It’s been quite a while since I’ve posted here, and it’s good to be back! I had a quick question for you Portable people out there: I just recently recapped a clean-looking backlit model, and it seems to be working fine off of my bench supply running at 6.8v. The problem is, lowering...

Thanks! Of all the Macs I've worked with, this one is the most temperamental. Even a 512k that has four years on this thing is easier to repair and understand. Sometimes it boots, sometimes it doesn't. The keyboard is finicky (but the Alps keys are so good!). Overall: this one's going to take a...

Yeah, I got the LA local eBay listing. I live in San Diego but the drive was worth it. It actually didn't work at first, I had to take it apart and clean the capacitor goo with alcohol and a toothbrush first. Only a temporary fix though.

Hey all, This is my first officially posted conquest. Although I've had more in the past, this one is especially cool to me. I got a EBay Local Pickup Macintosh Portable for about $5. It was missing a handle and the drive bay side of the cover, but everything else was untouched - it even came...

Oh, and also check out Apple.com for a cool homage to the 128k!

Hey guys, today is the 30th birthday of our beloved 128k Macintosh. I'd welcome you all to give a hearty "happy birthday!" In this thread and post any videos of the little guy you might have. Here's hoping for another 30 years of love for the one that started it all!

Haha thanks! I really is satisfying to finally fix something you put so much time into.

By the way here's proof :)

Great news! I was doing some bend testing to see what area I needed to resolder, when I brush the J4 connector and the screen flickers on! So I resolder the J4 connector pins and viola! It works! That little bastard was hiding in plain sight! On another note, while peeking around inside, I...

Ha! Something even weirder just happened: for some reason when I bend the analog board, the screen returns to normal! When I stop bending it (towards the side wall) it goes back to black! Any thoughts?

No, it's more of a "BNNNNNNNN" that goes continuously. I think it's coming from the actual CRT. Anyways, I just slapped the thing and I saw a flash of the "?" Screen. Also something new: when I slap the side, it sometimes restarts the computer and I get the startup bong but still no screen. Any...

Ok so I cut off the J1 connector and replaced it with another one, I resoldered the other end of the J1 connector (as well as C1) and tried turning it on. All I get now is either a loud "BUUUUU" humming noise, or a booting beep and that humming noise. The screen still doesn't turn on. What do...

Thanks for the advice! So you're saying that most compact mac's J1 connectors can just start melting over time?

Yeah, I'm going to try and scrape off some of the charred black bits and try to see if I can get the screen to work. What I'm wondering is what could have caused the meltdown in the first place? If the melting is caused by the C1 shorting, wouldn't that happen again?

I just did a visual check for leaks/bulging. What's weird is that I used to be able to slap it a little bit to get video (hinting at a loose solder connection) but now no amount of slapping will bring anything on the screen.

Hey there, I know I'm a little bit late to the thread, but I had this same problem and my C1 cap looks fine. Sometimes my 512k makes a prolonged buzzing noise when the J1 connector is plugged in, other times it seems to boot like normal except the screen is dark. Any thoughts?

Yeah! It feels good to not have screwed it up permanently AND fixed it to full working glory! Thanks again for all the help.

Hey guys, I just wanted to say that the problem has been solved. I guessed RAM 00000001 was actually F6, so I went ahead and replaced that chip with one I got at a local electronics supply shop. I'm very lucky that they had an ample stock of 4264's! I took out (somewhat jankily) the old RAM chip...