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| Macintosh IIcx issues |
Posted by: toples50 on 2016-11-14 09:30:03
I have a Mac Iicx which I tried today to power up but without luck.I see the motherboard power led flicker on and off and hear power click,see fan on power supply try to move but no farther than that.I haven't checked the battery yet.
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Posted by: TheWhiteFalcon on 2016-11-14 09:43:07
Likely bad PSU caps, logic board probably needs work too.
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Posted by: Elfen on 2016-11-14 09:57:43
Mac IIcx and IIci all need their logic board recapped by this time. That's a given. So recap the board first. Then if it does not turn on, the PSU is next. Recapping the logic board fixes 90+% of all PSU Issues with the Mac II cx and iici.
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Posted by: toples50 on 2016-12-01 23:00:05
I washed the board but the machine refuses to start up.I will try a PSU from my Iici.(update refuses again to start up...) 🙁
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Posted by: MJ313 on 2016-12-02 07:23:34
Time to recap the logic board.
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Posted by: Cory5412 on 2016-12-08 06:10:27
Moved to Mac II subforum.
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Posted by: Scott Baret on 2016-12-08 22:21:11
Most of the old manuals will tell you this is a PSU issue. I was having similar problems with a IIci many years ago and found a junk IIci (longtime members may remember the "Ouch Free IIci" I bought on Craigslist, which was "painted" with highlighter...I later sold it to JRL on here and he cleaned it up nicely). The power supply in the "Ouch" machine worked, and the machine in general was in good working order, but I decided to swap the PSU with that of my IIci. It didn't fix the problems I was having. Frustrated, I spent $30 and eBayed another PSU. No dice. A few years later, I got the logic board recapped, and that IIci has worked fine since.
This also brings back memories of a IIcx I came across in 2005. It seemed to be dead. I left it on a table overnight and didn't realize I had kept it plugged in. The next day, I went to work on other computers at that same table. The IIcx was still there, still plugged in. Suddenly, without warning, the IIcx came to life, as though a ghost had pressed the power key. This was, no doubt, a capacitor related issue (and is something seen on Color Classics if their analog boards go bad).
The PSUs in the IIci/IIcx are quite sturdy. It's these boards that aren't. (Notice a trend--the higher powered stuff from the late 80s had the worst boards...while the SE and Plus can go on forever).
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Posted by: MJ313 on 2016-12-09 06:00:31
^--tl;dr?
Time to recap the logic board.
😛
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Posted by: unity on 2016-12-09 16:40:29
Mac IIcx and IIci all need their logic board recapped by this time. That's a given. So recap the board first. Then if it does not turn on, the PSU is next. Recapping the logic board fixes 90+% of all PSU Issues with the Mac II cx and iici. This. While I am sure it will happen, I have yet to meet a IIcx/IIci that had a bad power supply. It seems to always end up being the motherboard, particularly around the startup circuit.
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Posted by: Elfen on 2017-01-15 09:42:20
True, Unity; 90% of PSU issues are with the startup circuit of the board and other shorted caps.Recapping the board will bring back a PSU one thought it was dead.
But I do have two blown PSUs from the two IIcx's I own. Money is tight on my end, so recapping a board and getting a new PSU have to wait. Besides, I need to get Hard drives too. These two PSUs were blown because of Power Surges that hit my building many years ago... It took out a lot of hardware I owned at the time.
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Posted by: unity on 2017-01-15 09:56:15
I would not consider those supplies to count towards the durability of these power supplies then. Its like saying a BMW is unreliable because it was involved in a flood and under water for a week.
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Posted by: toples50 on 2017-11-05 11:00:38
I washed the motherboard again today but without luck.Perhaps it needs to recap the Iicx...
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