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#1 2017-12-28 13:23:21

Tristanl
Member
Registered: 2017-12-28
Posts: 1

IIcx power issue (button needs to be hold)

Hi there,

i have some issues with the IIcx i just got. It will only hold Power while the power button is pressed (keyboard or switch in the backside) - and even then there ist no chime or picture, i'm also very sure that the HDD isn't running only the PSU and the Lights on the Computer and the Monitor.
PRAM Batterie is replaced but still no improvement. I might try to strip down the configuration (right now all RAM slots are occupied) but can't think of anything else atm.

Are there know issues with this series? (Bad PSU/Bord)

greetings

Tristan

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#2 2017-12-28 16:32:36

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 987
Website

Re: IIcx power issue (button needs to be hold)

More than likely you will need to replace the capacitors on the logic board. Be sure to look for any traces that have been blackened or eaten through by the capacitors' liquid electrolyte.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
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#3 2018-04-05 01:37:48

Joe
Member
Registered: 2018-04-05
Posts: 1

Re: IIcx power issue (button needs to be hold)

Hi Tristan, understand it's been a few months but I'd be curious as to how you solved this problem. I just bought a cheap Macintosh IIcx (my first classic Macintosh) and it has a pretty similar problem with the power switch. It doesn't stop me from powering it on, it because I can use the slot in the switch to screw it closed with a screwdriver, but then it won't turn off reliably even after I unscrew it. I end up dismounting the power cable to shut it off most of the time, which isn't great.

mcdermd, I have examined my capacitors and they look dandy, no leaks or bulges or discolored traces. It was clean as a whistle on the logic board, except for some slight dust.

Thanks very much for any tips, folks.

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#4 2018-04-05 05:36:59

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 987
Website

Re: IIcx power issue (button needs to be hold)

Leaky capacitors will usually look slightly greasy around the cap. That becomes a giant dust magnet. If it's been washed, that could be gone leaving you with dried out caps with a little brown crust hidden underneath them.

If they haven't been replaced, you need to do it. All of the originals are guaranteed to be leaking by now.

Last edited by mcdermd (2018-04-05 05:37:59)


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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