October 17, 2019, 03:34:05 pm

Macintosh Classic problems

Started by bronner, May 04, 2012, 10:54:01 pm

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bronner

Hi everyone,

I'm on roll with acquiring all of these old Apple computers! Today I got a Macintosh Classic. A couple problems...

I have a mouse, but no keyboard. Gotta work on that

Anyway, I booted it up, all excited, and was greeted by this:

http://db.tt/jVWGHDFt

One Google search told me leaky capacitor.

I opened it up with a torx wrench and isopropyl alcoholed around the capacitors with a cotton swab (q-tip).

Turned it on and, well... That picture about explains it all. And, I REALLY want to avoid putting it in the dishwasher at all costs.

mcdermd

First try removing all the RAM and reseating it. If you have a RAM expansion card, remove it for testing. You can also remove the socketed ROM chips and reseat them.

Did you see any goo on the board when you cleaned it? If so, you could very well be looking at a re-cap job. Do you have a good soldering station?

bronner

I'm going to borrow an extended screwdriver for opening up the case and try to reseat the ram. I cleaned the leaky capacitors with isopropyl alcohol and got all of the electrolyte off. This is my first classic Macintosh and I don't know much about them except the CRT is off-limits unless you know what you're doing.

I don't even know how to solder, so I don't have a soldering station. I'm more of a software guy.

t-rexky

If the electrolyte vented from the caps then you will need to replace them all.  They might be completely dry, in which case instead of nice smooth supply voltages you just have noise.  Ultimately running equipment with dried-out capacitors will lead to failures of other components, typically semiconductors.

bronner

I have the motherboard sitting in my lap and I just pulled out a:

Maxwell
Super
Lithium
ER3S (1/2 AA)
3.6V

Battery... Can this Macintosh classic still work without it? I believe it's the PRAM battery. Is that right? The most important thing is whether it NEEDS it. I've heard just pull the battery out, it'll be fine and I've heard no, leave the battery in even if it's dead. It need it in there to boot up. What's your opinion?

Scutboy

It should boot without the PRAM battery in, but I doubt that the battery would cause the screen you see.

Checkerboard or lines on the screen generally indicate RAM problems. If reseating the RAM didn't help, check and see if it's the correct RAM and/or in the correct slots if it's different size SIMMs.

bronner

Yup, it's all the right size. It used to belong to my high school, so I doubt they would mess it up. I don't know if I got the capacitors cleaned up all the way. I might do the dishwasher thing tomorrow. I need advice. How long, temperature (normal, light), how to dry (oven is NOT an option. My oven is too hot)

Thanks,

-Cody

bronner

Ok, I was taking my Mac Classic apart again to let my brother take a look and I heard a huge whooshing noise like air escaping. I instantly knew what it was. I broke the CRT. Now I have a completely empty shell of a computer.

MacBoy

I have located a PPC Mac mini, but the optical drive is toast, according to the owner. But they're willing to give it away, assuming it's still available.

I also found a Mac Classic that somebody is asking $25 for. Don't know what kind of shape it's in yet, but if they're not willing to give it way, they might be willing to trade for it.

I'll let you know when I find out.

bronner


MacBoy

The mini will run Leopard, and I still use optical drives (so do you, otherwise you couldn't get Panther, Tiger, or Leopard installed on anything).

QuoteShipping is to Michigan, USA so calculate accordingly.

Still waiting to hear from the owner of the mini, since they'd have to ship it to you, and you'd probably have to pay for shipping.

bronner


applefreak

Tiger, 10.4.11
best mac os ever made by Apple
especially for the power macs

compatibility, network, ...

the odd numbers  10.1 10.3 10.5 10.7
....suspicious .....