Mac LC-II battery corrosion, will it ever run again?

[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.

[PhilC]

Well no boot yet but the caps did make some nice sizzling noises best replace them first then.

[rubber_jonnie]

Well no boot yet but the caps did make some nice sizzling noises best replace them first then.

Hell yeah.

[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 (329.1 KiB) Viewed 173 times

Anyway, always change the caps on an LCII. If they haven't leaked before you power on they will have afterward.

[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.

[rubber_jonnie]

@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...

[PhilC]

Good suggestion @stephen_usher I’ll give that a try once I make the monitor adaptor.

[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 (313.85 KiB) Viewed 145 times

[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.

[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