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Quadra 605 not booting correctly
- Thread starter civil35
- Start date
mdeverhart
Well-known member
Welcome! Thanks for the video, it was definitely helpful in understanding the issue, though in the future I’d recommend also posting a text question/description as well, with a video to provide more detail or context as needed.
First, the capacitors are definitely going to need to be replaced in that board. Pretty much any Classic Macs with the can-style electrolytic capacitors will need replacement at this point, and anything from the Quadra era or earlier definitely does. The fact that you saw visible corrosion around that 1st RAM chip next to the two caps is indicative that those caps are leaking and need to be replaced. All of the cap goo needs to be cleaned off as well. It’s both conductive and corrosive, so it’ll short things out (causing functional failures) and it’ll corrode and eat away at the board and components (especially copper traces in the board and the legs of components).
The chimes you’re hearing are often referred to as “death chimes”, and indicate that the power in self test has failed for some reason. If you have a monitor connected you should see a Sad Mac with a couple of rows of errors codes underneath it, which would help narrow down the problem.
In this case, the problem is almost certainly cap goo around/under that first RAM chip in the bottom right of the board, near where you say the corrosion. The RAM is one of the things checked during the self test, and cap goo around that first RAM chip could cause a RAM test failure.
I’d recommend cleaning really well around that first RAM chip with IPA and a toothbrush. There may be cap goo under the RAM chip as well. You can try to get it out with plenty of IPA, but the right answer is probably to remove the RAM chip with a hot-air soldering station, clean under it, and reinstall it. Unfortunately, it’s hard to do if you don’t have a hot-air station and plenty of practice.
The other thing you can try would be to remove the 72-pin RAM SIMM (angled at the left). It will boot with just the on-board RAM, so removing the SIMM will eliminate one variable.
I’d also recommend you get a monitor connected so you can see the Sad Mac error codes.
Good luck, and let us know how it goes!
First, the capacitors are definitely going to need to be replaced in that board. Pretty much any Classic Macs with the can-style electrolytic capacitors will need replacement at this point, and anything from the Quadra era or earlier definitely does. The fact that you saw visible corrosion around that 1st RAM chip next to the two caps is indicative that those caps are leaking and need to be replaced. All of the cap goo needs to be cleaned off as well. It’s both conductive and corrosive, so it’ll short things out (causing functional failures) and it’ll corrode and eat away at the board and components (especially copper traces in the board and the legs of components).
The chimes you’re hearing are often referred to as “death chimes”, and indicate that the power in self test has failed for some reason. If you have a monitor connected you should see a Sad Mac with a couple of rows of errors codes underneath it, which would help narrow down the problem.
In this case, the problem is almost certainly cap goo around/under that first RAM chip in the bottom right of the board, near where you say the corrosion. The RAM is one of the things checked during the self test, and cap goo around that first RAM chip could cause a RAM test failure.
I’d recommend cleaning really well around that first RAM chip with IPA and a toothbrush. There may be cap goo under the RAM chip as well. You can try to get it out with plenty of IPA, but the right answer is probably to remove the RAM chip with a hot-air soldering station, clean under it, and reinstall it. Unfortunately, it’s hard to do if you don’t have a hot-air station and plenty of practice.
The other thing you can try would be to remove the 72-pin RAM SIMM (angled at the left). It will boot with just the on-board RAM, so removing the SIMM will eliminate one variable.
I’d also recommend you get a monitor connected so you can see the Sad Mac error codes.
Good luck, and let us know how it goes!
imactheknife
Well-known member
yup ram chips.. probably goo under ram where those two caps are. Maybe a bad via, broken trace
