Page 2 of 4
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 27 Oct 2023 14:14
by rubber_jonnie
Nice progress, be good to see it booted.
I once had an LC475 and got rid of it due to lack of space at the time, along with 2 or 3 LC's. Really wish I'd held on to it.
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 27 Oct 2023 14:39
by PhilC
Well no boot yet but the caps did make some nice sizzling noises :lol: best replace them first then.
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 27 Oct 2023 15:23
by rubber_jonnie
PhilC wrote: 27 Oct 2023 14:39
Well no boot yet but the caps did make some nice sizzling noises :lol: best replace them first then.
Hell yeah.
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 27 Oct 2023 16:36
by stephen_usher
I'd try powering it via the MOLEX connecter for the hard drive with a bench power supply to see what the current draw is. With just the +5V it won't bong but will boot (without a hard drive or floppy it takes a while before you see anything).
Here's one I made earlier... ;-)
IMG_9900.jpg
Anyway, always change the caps on an LCII. If they haven't leaked before you power on they will have afterward.
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 27 Oct 2023 17:32
by PhilC
@rubber_jonnie i really wasn’t expecting it to start to be honest and the caps sizzling away made me chuckle, they are being replaced hopefully this weekend.
Oh and must get my monitor adapter made.
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 27 Oct 2023 17:57
by rubber_jonnie
PhilC wrote: 27 Oct 2023 17:32
@rubber_jonnie i really wasn’t expecting it to start to be honest and the caps sizzling away made me chuckle, they are being replaced hopefully this weekend.
Oh and must get my monitor adapter made.
Good luck!!
I'll think of you when I'm replacing the caps on my Saturn...
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 27 Oct 2023 18:44
by PhilC
Good suggestion @stephen_usher I’ll give that a try once I make the monitor adaptor.
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 28 Oct 2023 20:38
by PhilC
Replaced all the electrolytic caps on the motherboard tonight, plugged it in and sizzle sizzle but not from the motherboard this time, from the PSU. So I've replaced all the low voltage side caps and fixed a whole load of dry joins that weren't visible before the sizzling.
So now on power up it beeps three times, just turned it off as I'm going to make my video adapter before going any further but I'm pretty please so far.
IMG_2904.jpeg
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 28 Oct 2023 21:17
by stephen_usher
Erm, an LCII should never beep.
Also.... Eek! Radial caps in place of SMD ones! I do hope those pads don't lift when you move the machine around. Mac PCBs of that date are really fragile.
Re: Mac LC-II battery corrosion, will it ever run again?
Posted: 28 Oct 2023 21:28
by PhilC
@stephen_usher it turns out that it was the HDD beeping three times, the fan starts etc etc.
I was careful soldering on the caps and the reason I chose that type is because of the poor success rate I have with the SMD variety.
Once it’s working I’ll hot snot the caps into place