• Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.

575 motherboard corrosion - fixable?

Hi all, I've spent many many years now looking for an LC575 and a few weeks back I finally found one locally for the price of nothing! Non working but "how bad could it be" I thought. Well..

The battery had started to leak and corrode, as well as the typical 90s and leaky caps. So I cleaned the board as best I could, checked any traces that looked particularly bad, etc. As far as I can tell, there's only two broken ones that go the expansion port, so they shouldn't stop the system from booting. However I haven't had any luck. I can hear the crt degaussing, hard drive spins up, cd drive works etc. But no boot chime, black screen and no hard drive activity. The CPU does get warm after a few minutes, so I assume it's at least doing something. 

Any traces in particular I should look at more closely? I've replaced half of the caps on the board (I only had a few leftovers from my se/30 recap) but that has changed nothing. The white residue is left over from the isopropyl, I've given it many coats as well as even washing it with water but I can't seem to get it any cleaner than this. So yeah, is this board fixable or am I going to have to continue my long standing quest for a 575?

https://m.imgur.com/a/AmdzkDo

(Photos won't upload here for reasons unknown)

Also anyone know anything about this video card it came with? Can't find anything about it online.

 

LaPorta

Well-known member
Im dealing with this same issue on a Mac SE, I’ve got a thread in Compact Macs. I’ve learned so far:

- The battery acid will kill passive components. I’ve had to replace resistors and capacitors. Check each one hit by the acid with your multimeter.

- Even if you clean it until it shines, there is likely a ton of battery goop hidden under components and chips. You may need to remove them to see. Traces underneath may be shorted or cut.

if I find out more, I’ll let you know!

 
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