TheMrKocour Posted February 26, 2020 Report Share Posted February 26, 2020 (edited) Hi, i have lots of old Macs. I think most of 68k will need recap ASAP. But should i also start with PPC Macs (601-604)? Also which caps are in Performa 630 Power Suppy? List of some of my Macs Mac LC II - Recap ASASP Mac LC III - Recap ASAP Mac LC 475 - Recap ASAP Quadra 650 - ??? PowerMac 7200 - ??? PowerMac 7300 - ??? PowerCenter 120 - ??? PowerMac 9600 - ??? PowerMac G3 Beige - ??? PowerBook 160 - Recap ASAP I think i dont need to worry about color Macs Edited February 26, 2020 by TheMrKocour Quote Link to post Share on other sites
sstaylor Posted February 26, 2020 Report Share Posted February 26, 2020 I was working with a G4 mini last year that showed evidence of cap leakage. So yes, I would expect 601-604 based systems to need it too. If not now, soon. Quote Link to post Share on other sites
LaPorta Posted February 26, 2020 Report Share Posted February 26, 2020 I am changing all the caps on my machines, but I am working my way up from oldest to newest. No evidence, but one would expect leakage on a 20 year old machine to be less than that on a 30 year old one. Quote Link to post Share on other sites
RC14 Posted February 27, 2020 Report Share Posted February 27, 2020 Not what @TheMrKocour was asking, but what about the early macs (128k, 512k, Plus)? I've seen conflicting information - both that they need recaps and that they don't (the analogue board does but not the logic board maybe). Does anyone have a definitive say on that? I fail to see why they'd be different from the other, later macs. Quote Link to post Share on other sites
LaPorta Posted February 27, 2020 Report Share Posted February 27, 2020 Generally speaking, the axial and radial electrolytics don’t leak with anywhere near the frequency of the surface mounts. There is immediate danger to boards from leaking electrolytic. The 128k-Plus logic boards aren’t prone to this with their axial caps. They almost never go bad, though at some point they will likely go out of spec, after which they should be replaced. They are so cheap, I usually do it anyway. The AB caps take much more abuse over life (especially with a passive cooling system) they fail much sooner. Replacing at this 35 year old age is prudent for any electronic. Quote Link to post Share on other sites
tokyoracer Posted February 27, 2020 Report Share Posted February 27, 2020 (edited) Some are more prone than others. You might want to consider the more advanced high-end 68k machines first. That said there are so many factors that come into cap leakage from what caps they used from the factory at the time it was assembled, to the ammount it has been used (and possibly even the condition of the power supply). Rule of thumb, if you want to keep things simple, oldest to newest is a good plan. But IMHO, I think it would pay to take some time and research the machines most prone. Look at the condition of your machine's boards, look for tell-tale signs when powering on and running (from audio issues to non-booting garbage on the screen) and decide then what to recap. One thing you should do, if you only have limited time and/or funds, wash the problematic and iffy looking boards to avoid any further corrosion while they are queued up for recapoing in the future. Edited February 27, 2020 by tokyoracer Added paragraph. Quote Link to post Share on other sites
Pushpull76 Posted November 24, 2020 Report Share Posted November 24, 2020 Every electrolityc capacitor will leak, due to quality or defects in the original design. I have two oscilloscopes from the nineties by Tektronix, who are famous for the quality (and the prices) of their products....they are a caps leaks party. The rule is : if the machine has more than 15 years, just check and eventually change them. Quote Link to post Share on other sites
Juror22 Posted November 24, 2020 Report Share Posted November 24, 2020 (edited) For the machines that I can't get to re-capping right away, I make a diagram of what caps (mf, V and type - size if I know it) went where (I don't usually include orientation, since it is marked on the board) then I un-cap the board, wash it and set it aside (usually reassembled back into the computer is the safest place), with the documentation attached. That way it can't get any worse, until I get to it. I currently have only about 3 in queue right now (un-capped, waiting for me to get around to it), but I'm thinking that I should get around to re-capping my cube. I've never had it open and its in perfect shape, being boxed up for years, but I have read that others had to re-cap theirs. I also have other computers, like my Tandy and other brand laptops that need it as well. I too have mostly re-capped oldest to newer; I've never yet had to re-cap an SE. Edited November 24, 2020 by Juror22 Quote Link to post Share on other sites
joshc Posted December 4, 2020 Report Share Posted December 4, 2020 Even when caps physically look OK and there's no visible leakage, they may still require replacement. Often the leakage is just directly underneath the cap and hasn't spread yet. I've recapped numerous boards that were like this. Caps are so cheap, that I would really think it makes more sense to recap than not, regardless of what model it is (assuming it uses electrolytic capacitors). I haven't heard of capacitor problems in PowerMac G4s yet, but I have heard of trouble with the eMac and iMac G5s because they used lower quality capacitors than other models. Quote Link to post Share on other sites
CC_333 Posted December 5, 2020 Report Share Posted December 5, 2020 @joshc The eMac and iMac G5, I believe, were affected by the industry-wide capacitor plague of 2001-2008 (Dell is well known as being among the hardest hit, especially from 2004-2007, but Apple got hit too). Otherwise, it seems that most Macs from the beige G3 onward are still in fairly good shape cap wise, though models built before 2000 (basically all G3s and early G4s) should be monitored somewhat closely, because any caps in those are likely reaching the end of their normal lifespans soon. c Quote Link to post Share on other sites
Oberlehrer Posted December 7, 2020 Report Share Posted December 7, 2020 On 12/4/2020 at 2:51 PM, joshc said: I haven't heard of capacitor problems in PowerMac G4s yet I seem to recall that the power supplies in the MDD G4 failed quite often; and I think this was also a cap issue. Quote Link to post Share on other sites
joshc Posted December 7, 2020 Report Share Posted December 7, 2020 7 hours ago, Oberlehrer said: I seem to recall that the power supplies in the MDD G4 failed quite often; and I think this was also a cap issue. Sorry, I was referring to logic boards. Yes, power supplies are more prone to capacitor failure generally because of exposure to high temperatures. Quote Link to post Share on other sites
demik Posted December 8, 2020 Report Share Posted December 8, 2020 (edited) Just to add some from personal experience Mac LC : Recap ASAP IIcx : Recap ASAP Quadra 650/800 : This one is on a per case basis. Some motherboard only have solid caps, others got electrolytics. G3 Beige : Do not need recap. Got one runing 24/24 since years and never saw one bad. PB 1xx : Might need a recap, but usually everything is dead before at that point (screen, HDD, power adapter, interconnect board...). Got 5 Logic boards ok (145/145b/165c x2, 180x2) still running strong but and everything else is dead. Never got one bad PowerBook 1xx. However, half of the power adapters needs recap. If the machine is "unstable", ususally it's the power adapter and not the logic board. PB 1xx with passive grayscale screens need a screen recap though. PowerMac 6100 : Might need recap, depend of the Motherboard revision PowerMac G5 SP 1.8 : Need recap (no leakage beaacause Axial caps, but stability issues). Only the 2004 SP got Axial caps IMHO the worst are the LC series. All of mine had leakage and corroded motherboard (had to redo traces, ripped pads, etc...) Dead logic bopards by caps counter : 1x LCII, 1x LC475, 1x 6100 Edited December 8, 2020 by demik Quote Link to post Share on other sites
Daniël Oosterhuis Posted December 8, 2020 Report Share Posted December 8, 2020 2 hours ago, demik said: PowerMac 6100 : Might need recap, depend of the Motherboard revision I also find that 6100, 7100 and 8100 boards from Japan need recapping, way more than those kept in most Western countries. The boards I see on Yahoo Auctions and such are often pooled with capacitor leakage, as did both an 8100 board and 6100 AV card that I got from YA through Buyee as well. I'm guessing climate differences might affect the severity of capacitor leakage as well. Quote Link to post Share on other sites
demik Posted December 11, 2020 Report Share Posted December 11, 2020 On 12/8/2020 at 11:42 AM, Daniël Oosterhuis said: I also find that 6100, 7100 and 8100 boards from Japan need recapping, way more than those kept in most Western countries. The boards I see on Yahoo Auctions and such are often pooled with capacitor leakage, as did both an 8100 board and 6100 AV card that I got from YA through Buyee as well. I'm guessing climate differences might affect the severity of capacitor leakage as well. Probably true. I got a few (dead) 68k from UK and they were rusted everywhere. Never saw a rusted CDROM drive before. Quote Link to post Share on other sites
cheesestraws Posted December 11, 2020 Report Share Posted December 11, 2020 11 minutes ago, demik said: Probably true. I got a few (dead) 68k from UK and they were rusted everywhere. Never saw a rusted CDROM drive before. A number of my machines were stored in a village by the sea (in the UK) for a number of years and before that had spent their life nearby along the coast. Those machines certainly *seemed* to rust (though not cap leak) more than my inland machines; it may have been the salt in the air. Certainly cars and so forth rapidly corroded around there... Quote Link to post Share on other sites
snes1423 Posted December 16, 2020 Report Share Posted December 16, 2020 how about a powerbook g4 12 inch or a unibody macbook pro (in the future) Quote Link to post Share on other sites
Cory5412 Posted December 16, 2020 Report Share Posted December 16, 2020 Those two are at least a decade, probably a little closer to 15, and closer to 20 for the newer of the unibody MBPs, years away from needing a recap. Quote Link to post Share on other sites
toples50 Posted December 18, 2020 Report Share Posted December 18, 2020 How about Mac II series and compact Macs? Quote Link to post Share on other sites
ArmorAlley Posted December 21, 2020 Report Share Posted December 21, 2020 On 12/18/2020 at 5:07 PM, toples50 said: How about Mac II series and compact Macs? My Mac IIfx needed a recap back in 2014. The advice that I have been given since is to use the machine until a cap goes and then get it fully recapped. Be sure to replace the 30 year old batteries, however, with either none (if possible) or new ones. Quote Link to post Share on other sites
joshc Posted January 9 Report Share Posted January 9 (edited) On 12/21/2020 at 2:37 PM, ArmorAlley said: The advice that I have been given since is to use the machine until a cap goes and then get it fully recapped. Capacitors can start leaking but still work for some time, and this capacitor leakage can start to damage the board. I've had several boards which visually look great, and even work, but when I removed the capacitors they had started to leak. I would say it's best to take preventative measures at this point, with any pre-1997 machines. Capacitors are cheap enough if you're just doing a couple of boards, and could prevent substantial logic board repairs. Edited January 9 by joshc Quote Link to post Share on other sites
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