Sid1968 Posted April 24, 2020 Author Share Posted April 24, 2020 11 minutes ago, Schmitzi said: What is an ESR ? https://www.elektroniknet.de/elektronik/distribution/was-versteht-man-bei-kondensatoren-unter-esr-135202.html 1 Quote Link to comment Share on other sites More sharing options...
humeur Posted April 24, 2020 Share Posted April 24, 2020 ESR it is a device that allows you to check the capacitors without desoldering them, which measures the internal resistance of the capacitor, and then you compare the value with reference values. you know right away if a capacitor is normal. Jean Louis 1 1 1 Quote Link to comment Share on other sites More sharing options...
humeur Posted April 24, 2020 Share Posted April 24, 2020 2 hours ago, Sid1968 said: As I wrote in my first post: "Some people think that they do not need an Elko-Change until a device gets problems. Make your on decision." I did not waited for a 38 year old component that only costs a few cents to break and maybe break components that are difficult to get or even no longer available! And if you look at the result, it's worth seeing, isn't it? I also mean that on the LCD screen. But of course I prefer to respect your decision to wait until your device gets problems. I wish you that your TI-99/4A will live for a very long time. Conversely, please respect that this thread is about successfully performing the elkochange on the TI-99/4A. Something that goes without saying in the commodore scene. You cannot compare the manufacture of capacitors from the 1980s to those of today. I have not had an answer how many have you find bad in the ti99, and the control of these has been done before changing them. I only change if it's useful 1 Quote Link to comment Share on other sites More sharing options...
Sid1968 Posted April 24, 2020 Author Share Posted April 24, 2020 (edited) 12 minutes ago, humeur said: ESR it is a device that allows you to check the capacitors without desoldering them, which measures the internal resistance of the capacitor, and then you compare the value with reference values. you know right away if a capacitor is normal. Jean Louis The ESR is not a device, its the "equivalent series resistance" of a capacitor, that we call in german "Ersatzserienwiderstand". Edited April 24, 2020 by Sid1968 1 Quote Link to comment Share on other sites More sharing options...
humeur Posted April 24, 2020 Share Posted April 24, 2020 (edited) 5 minutes ago, Sid1968 said: ESR is not the device, its the "Equivalent series resistance", that we call in german "Ersatzserienwiderstand". it's playing on the word everyone speaks ESR. By cons your idea to change the 78M12 regulator by these small switching power supply module is excellent, performance being less efficient. Jean Louis Edited April 24, 2020 by humeur 1 1 Quote Link to comment Share on other sites More sharing options...
Sid1968 Posted April 24, 2020 Author Share Posted April 24, 2020 Just now, humeur said: it's playing on the word everyone speaks ESR. Maybe everyone you know. In Germany, we usually name things with their correct names or abbreviations. I think that is also so common in English-speaking countries. Quote Link to comment Share on other sites More sharing options...
humeur Posted April 24, 2020 Share Posted April 24, 2020 2 minutes ago, Sid1968 said: Maybe everyone you know. In Germany, we usually name things with their correct names or abbreviations. I think that is also so common in English-speaking countries. I am in France and when you say ESR people understand that it is the measure and not the definition. Quote Link to comment Share on other sites More sharing options...
Sid1968 Posted April 24, 2020 Author Share Posted April 24, 2020 I wish you a happy day. 1 Quote Link to comment Share on other sites More sharing options...
humeur Posted April 24, 2020 Share Posted April 24, 2020 Just now, Sid1968 said: I wish you a happy day. Thank you for such a good day and take care of yourself. Jean louis 1 Quote Link to comment Share on other sites More sharing options...
Sid1968 Posted April 27, 2020 Author Share Posted April 27, 2020 (edited) Hi Guys, the method proposed by "humeur" to check the function of an electrolytic capacitor by measuring the ESR is well suited for this. If you want to check your TI-99/4A for damaged electrolytic capacitors, you can use this method. But why is this not necessary when changing the elkos completely? If you want to get detailed information about an electrolytic capacitor, please have a look at the wiki here: https://en.wikipedia.org/wiki/Electrolytic_capacitor Have a look under "Reliability (failure rate)" and "Lifetime". The "Early Failures" and the "Wearout Fairlures" are problematic in the Life of an elektolytic capacitor. The "Wearout Fairlures" increase exponentially with age!!! This is what it is all about changing the complete elkos. A direct failure of an electrolytic capacitor cannot be predicted exactly. You have to estimate it based on several factors. But if I have a 38-year-old device in front of me, as in the example above, the probability of failure is quite high, because of the exponentially increasing probability of"Wearout Fairlures". Of course, the device could theoretically continue to work flawlessly for another 38 years ... but it is that probably??? The overall question is not whether an electrolytic capacitor needs to be changed, but when. The complete exchange of the elkos now, even if everyone should still work now, has the advantage that, so far no other component has been damaged by a defective electrolytic capacitor, the new elkos are relatively cheap, the time required is limited to a few hours and you have a refreshed system afterwards. With the new electrolytic capacitors, there is no need to worry about the next 20-30 years or more, if you use the device in a normal way. Since a defective electrolytic capacitor can also damage other components in the worst case, I decided to completely exchange all elkos and can only recommend it to everyone. But, as I mentioned in this thread, everyone has to decide for themselves. Best regards Sid1968 Edited April 27, 2020 by Sid1968 Quote Link to comment Share on other sites More sharing options...
humeur Posted April 27, 2020 Share Posted April 27, 2020 Sorry this texte is in French Une réparation due à une défaillance des condensateurs électrolytiques est devenue un phénomène banal, inhabituel dans les années 80. translate: Repair due to electrolytic capacitor failure became commonplace, unusual in the 1980s. https://qastack.fr/electronics/253976/what-happened-to-electrolytic-capacitors-in-the-21st-century on the old capacitor you could reform the electrolyte https://www.carnets-tsf.fr/condensateurs-anciens/reformer-les-condensateurs.html sorry in French. But, as I mentioned in this thread, everyone has to decide for themselves. By cons I retain your idea of changing the regulator, If on the capacitors we are not entirely in agreement I tell you very good idea? Quote Link to comment Share on other sites More sharing options...
Sid1968 Posted July 16, 2020 Author Share Posted July 16, 2020 On 4/23/2020 at 9:56 PM, Schmitzi said: Very cool list, thanks. As I am customer at Reichelt, I ordered parts for 3 x PHA2037, 2 x Mainboard and 3 x PSU I also made 3 shopping carts, for later use. I am going to try it !! If you don´t here from me anymore, please call the firefighters Hey Schmitzi, are you still alive or do i have to call the firefighters? Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted July 16, 2020 Share Posted July 16, 2020 6 hours ago, Sid1968 said: Hey Schmitzi, are you still alive or do i have to call the firefighters? yeah, I am here I got all the stuff but buried it somewhere because of lack of time Quote Link to comment Share on other sites More sharing options...
Omega-TI Posted July 16, 2020 Share Posted July 16, 2020 2 minutes ago, Schmitzi said: I got all the stuff but buried it somewhere because of lack of time Lack of time is the working man's enemy. Ten more years until retirement here. I have to wonder what kind of amazing toys we'll have for this computer then. Quote Link to comment Share on other sites More sharing options...
+acadiel Posted July 17, 2020 Share Posted July 17, 2020 Do ESRs matter with any of our capacitors? In some of my old computing equipment, I really hadn't noticed it mattering, but some folks have been super vigilant about making sure. I saw someone made a DigiKey BOM - perhaps we can make a Mouser one too and our European friends can make one from a supplier over there. I have replaced caps on a lot of 80s-2000s equipment in the past not knowing about ESR - just using high quality capacitors, and everything is still running just fine. Some of the fun things in 80s equipment are the RIFA caps from the 80s that go into flames and let the magic smoke out (these are the high voltage across AC). Aren't you glad we don't have these? 1 Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted July 17, 2020 Share Posted July 17, 2020 Quote Link to comment Share on other sites More sharing options...
Sid1968 Posted July 19, 2020 Author Share Posted July 19, 2020 On 7/17/2020 at 2:45 PM, acadiel said: I have replaced caps on a lot of 80s-2000s equipment in the past not knowing about ESR - just using high quality capacitors, and everything is still running just fine. And you really made that right, Mate! On 7/17/2020 at 2:45 PM, acadiel said: Some of the fun things in 80s equipment are the RIFA caps from the 80s that go into flames and let the magic smoke out (these are the high voltage across AC). Aren't you glad we don't have these? Not having them is definitely an advantage. ? Quote Link to comment Share on other sites More sharing options...
+mizapf Posted July 19, 2020 Share Posted July 19, 2020 I think this was the same thing that happened to me when, during my visit at the seller of the TI Professional Computer, we powered the machine up. A few seconds later we had a room full of smoke, but the computer still worked. At least I could lower the price by € 50,-. Back home, a closer inspection proved that a capacitor in the power supply exploded. Looks spectacular, in any case. Quote Link to comment Share on other sites More sharing options...
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