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Can someone upload some pictures of the area of the board near the reset and interrupt switches? I am trying to order replacement parts and I want to make sure that the component values are what I think they are. There don't seem to be any pictures of that area in the link that tattar8 provided...

Thank you for this advice. I will try to resolder the parts that fell off and I hope that my RAM chips aren't bad.

Thanks! I will look into that.

Do you know the values of the components that I listed above? They disintegrated when I was cleaning the board so I don't know what to replace them with.

I recently bought a Macintosh Quadra 700 off of eBay (https://www.ebay.com/itm/Vintage-Apple-Macintosh-Quadra-700-M5920-Desktop-Computer-w-Harddrive-Mac-iMac/273781054522?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649) and it has some corrosion on the logic board from a leaky...

Sorry for the late reply, but I checked the resistor network the way that you described and it seems to be fine. I don't know what the problem is at this point. Do you think that I should just give up on it?

How would I go about testing that part? What does it do exactly?

I guess the chip itself is just about the only thing left that could be fried. I will try to order a replacement and get it installed to see if the IC is the problem.

Yes. I have already cleaned the floppy drive and it works fine. The computer still exhibits the symptom even when the drive is unplugged, so the drive itself is not the problem. In addition, the dialog box asking to initialize the disk shows an arrow pointing to an external drive, not the...

It turns out that I was completely wrong about the bad part. I tested it again and it checks out just fine. I guess that I didn't make good contact with it the first time I tested it since it is so small. Now that I am certain that all three capacitors are good, I am not sure what is wrong. Any...

It turns out that the problem was indeed with the RAM. All of the SIMMs were good, but one of the sockets that still had the tabs on it needed pressure applied to its SIMM in order to make a good connection. I simply wedged a small piece of plastic between the SIMMs to apply pressure and now it...

Perfect! I will try to test the SIMMs in my SE tomorrow afternoon and see if any are bad.

All 8 slots are currently filled and I checked to make sure that each set of four is made up of the same type of stick. Does the Macintosh SE have SIMM slots that I could test the sticks in? I have one of those but I have not opened it up in a while.

I just checked between C2 and R3 and I realized that there was no connection. I touched up the solder on C2 and now the internal sound works fine. Unfortunately, I don't think that I have any way to test the RAM. Could I just try each stick of memory one stick at a time until I find one that...

I just checked the amplifier chip and everything seems to be fine. There is a steady 5 volt signal on both pin 1 and pin 4. I also traced the lines coming from the chip and found that there are 3 capacitors in the amplifier circuit: CS2, CS4, and CS6. I tested all three capacitors and CS6...

I just plugged headphones into the speaker jack and discovered that the computer plays the chimes of death immediately after I press the power button. Does this help to narrow down the problem?

Maybe I could use my oscilloscope to clip onto the chip and take a voltage measurement since I don't have any of those clip leads for multimeters. I will try this tomorrow and see how it goes.

That's what I thought. So how should I access the chip then? I can't think of any ways to check voltages with power applied without disconnecting things from the analog board.

Unfortunately, I do not have another logic board that I can test it with, so I am kind of stuck if the logic board is the real problem. I just took the back off of the Color Classic and I realized that the amplifier chip is hidden in a very inconvenient location. It is directly under the CRT...

I have not recapped the PSU, but the fan spins, the power light comes on, and the floppy drive makes a short sound when the computer turns on. Doesn't that mean that the power supply is probably fine when you also consider the fact that I could occasionally get it to turn on before I did the recap?