That was very sweet and great of you to spend time on answering someone of your subscribers. You diverse our respect sir. Keep up the great work. I appreciate that
Thanks for the kind response. I hope that the guy will manage to fix his ASA5505. Although the value of these firewalls is rather low nowadays, just for the fun it is already worth to repair one...
One of my ASA5505 recently failed to power up after more than 10 years of operation. Glad I found your video. Replaced C275 and it is running fine again. While I was at it, I replaced the empty CR2032 battery and also replaced the 512MB CF card by a 2GB card.
СМД электролит сдох... В ноль.. И все дела... А то пол платы перепахать... Туда и обычный подпаять можно. In any way this capacitor "starts" the whole chain of the power supply for the board.
Hello Friend! Thank you so much for your work. I repaired my ASA 5505, which I had at home. I removed the C 275 capacitor (22 pF) and changed it to another, larger capacity. ASA immediately launched! Guys, put large capacitors capacitors, if you do not have these at hand. I think this is normal. I also advise you to put a small fan in the case. I put the 12 volt, and connected it to the 5 volt bus (USB). It is very quietly spinning and creates sufficient air circulation.
Donkey you are awesome! I just repaired one of my asa 5505's that would not power up. I replaced C275 with a larger 33uf 50v capacitor, it fired right up. I'm feeling like a boss! Thanks to you. For those of you trying to repair your asa 5505 from this problem here is what I did. I have an ESR meter that tests capacitors. From my testing it seems that you can test these 5 capacitors in-circuit. Best to take them out, but on my tests C275 tested to 17.5uf and esr of >40 ohms, it tested the same in or out of circuit. >40 ohms is not good from what I understand. An esr value closer to zero or less is better. So I found the closest replacement capacitor I had on hand, just to see if the thing would power on and It did so immediately. I should replace all of the caps with proper replacements. Donkey, if you can maybe you could post the actual values of the capacitors as some of them are not clear on the size and voltages required.
Thank you very much for the video. I have repaired my ASA5505 only replacing the C275 capacitor (22 uF/35V) with a higher voltage capacity capacitor (22 uF/50V)!
Thanks a lot! In my case it was C275. I heat the capacitor with a heat gun as shown on the original video, the board came up, but did not start again after cool down. To confirm, I momentary connected a 22uf/50v radial capacitor over existing, and the board start working
I am happy that the video helped you, and also the environment has one less Cisco ASA5505 in the landfill. Although Cisco boards use quality components, sadly caps will dry out after 5-10 years, and they need replacing.
Hi, base on my experience i was repair this CISCO ASA5505 i received this item from my customer (No Power) i was completed my troubleshooting and replace few component in primary section and secondary section. Primary Section i was replace E-Cap C275 Component ID and capacitor value 22uF/35V . in secondary i was replace Capacitor,C307,C308 & CR25 ,this component i was measured in multi meter its was shorted. Once i replace the system is power On is working well, hope this will help. Thank you
I'm looking for the transistor (mosfet?) Q26... what is short-circuit on my ASA. On the package I could read C12W AP... - didnt found any datasheet for... - do you have the schematic ?
Pls can you make a video on cisco switch 3400 FS, if the power supply inside the switch is working properly but the circuit is not working..... how we can do troubleshooting
Yes, the tantalums seem to be 47uF/16V. I would replace those most probably with 100uF SMD electrolyte caps, which are 0.2Euros and they can be almost directly solder back in place of the tantalum cap footprint. Also, the ESR of the tantalum caps is very low, so using a higher value electrolyte will kind-of compensate for the ESR difference.
Sir, thank you for this video. I'm trying to get life to a VCR/DVD combo for a long time. I have replaced some diodes and the controller IC of the PSU... Also one funny measuring cap. Now I tried the heatgun trick and it came back to life ;) You say "the capacitors (mainly electrolytic and tantalum caps on this PCB) which have high equivalent series resistance when they are cold due to old age, since the electrolyte degrades with time." Can you clarify this? What happens with an old cap? Does it start to leak? Does the value change? Why it prevents to startup the PSU? A short or wrong value? I love your video's. Learned more with it then in 2 years high school ;)
To answer my own question. The PSU started when the caps where heated. When I measured with the scope, the DC looked very bad. Huge rimple. So at high freq, the internal resistance of the cap rises a lot. So it can't do it's work. When measured with a normal cap meter, it looks OK.
@@eddysmit Exactly, as you have noticed, one cannot really measure an old dried out capacitor with a standard meter. Instead, you will need an LCR meter, which also measures the so called ESR (equivalent series resistance) of the capacitor. Practically what happens is that the electrolyte, which is a liquid when the cap is new will slowly dry out, and get more viscous like paint dries with time. Due to the lower ion mobility the internal resistance will increase, and the capacitor will no longer behave like a capacitor, but instead behave like a capacitor put in series with a resistor, which is no good.
I had the same problem, i had to replace the 47uF cap and the 22uF, the device came back to life. Actually the problem was with the 22uF one, I later found out
I am glad that this short video have helped out couple of people who were brave enough to replace the caps ;) Good job! Enjoy your Cisco ASA for a couple more years.
hello Donkey Learning, you were right, the 20efd-u26 replacement make ma motherboard burn. As I had another motherboard of 5505, I order a capacitor C275. But before I try to use polarised capacitor 22 micro farad to put above the c275 without take it off the motherboard. And the asa turn on. I should received new capacitor and try to make video in English :) and we wi9ll see. Again many thanks for you videos. ounet
Good to hear that your ASA is slowly getting better. I would replace all five caps, because when one is dead, the other ones tend to go dead soon after as well. Let me know whether you have managed to fix it.
Hi I have Cisco 5516 firepower device and it has a issue like the device has power on LED and status LED is amber also when i connect the LAN port is not showing UP please help me out is possible
There’s a field service notice on the 5516 for failing. One field notice is due to a feeling clock in another due to feeling resistor which give you power on green and status Amber. The device becomes unusable. I just had one feel like this.You can verify your serial number to see if it was one of the affected. Three of the four ion have been affected.
Could you please make a short animation from powering up to voltage out about SMPS. Actually a animation how ac voltage travel via semiconductors and transformer and then DC output made. Waiting for your 3rd part of SMPS tutorial.
I was thinking about making something like that via Blender, but I am really bad with Blender, and I can so far make only basic shapes. Nevertheless, first one must go through the block diagram, otherwise even a good animation would not be very helpful. My third video is 70% done, but I am fully swamped in my job, and for the weekend I must take a brake. It will be done soon, and it should be an informative video on inductors.
Hello. today I repaired one of these problematic ASA5505. I found "a franch video" mentioned here and trying to warm up power section with hot air - without removing transformator... And whats suprise... unit light on. So after cool down unit returned to failed state, so I started to warm up every component near transformator. It looks like only one component went bad, electrolytic capacitor 22u35V on the border of the power section. I was simply replaced it with another non smd (22u/100V), there is planty of space to use it. I hope it can help to someone else :-)
All you need is a new cap, a soldering iron, little bit of flux, two tiny drops of solder, *and a lot of patience* Joke aside, it is easy to replace it, just desolder, remove old solder with solder wick, solder new cap back on. It should be ready to go, good as new!
That was very sweet and great of you to spend time on answering someone of your subscribers.
You diverse our respect sir.
Keep up the great work.
I appreciate that
Thanks for the kind response. I hope that the guy will manage to fix his ASA5505. Although the value of these firewalls is rather low nowadays, just for the fun it is already worth to repair one...
One of my ASA5505 recently failed to power up after more than 10 years of operation. Glad I found your video. Replaced C275 and it is running fine again. While I was at it, I replaced the empty CR2032 battery and also replaced the 512MB CF card by a 2GB card.
For sure the battery and cfcard are not to blame
I think it's a common problem. Capacitors! After 10 years up, once down and never up again.
Have you got a link to where you purchased the C 275 capacitor?
Огромное спасибо! Оживил ASA5505 заменив конденсатор C275.
Thank you very much! Revived the ASA 5505 by replacing the C275 capacitor.
СМД электролит сдох... В ноль.. И все дела... А то пол платы перепахать... Туда и обычный подпаять можно. In any way this capacitor "starts" the whole chain of the power supply for the board.
Hello Friend!
Thank you so much for your work. I repaired my ASA 5505, which I had at home. I removed the C 275 capacitor (22 pF) and changed it to another, larger capacity. ASA immediately launched!
Guys, put large capacitors capacitors, if you do not have these at hand. I think this is normal.
I also advise you to put a small fan in the case. I put the 12 volt, and connected it to the 5 volt bus (USB). It is very quietly spinning and creates sufficient air circulation.
Have you got a link to where you purchased the C 275 capacitor?
Donkey you are awesome! I just repaired one of my asa 5505's that would not power up. I replaced C275 with a larger 33uf 50v capacitor, it fired right up. I'm feeling like a boss! Thanks to you. For those of you trying to repair your asa 5505 from this problem here is what I did.
I have an ESR meter that tests capacitors. From my testing it seems that you can test these 5 capacitors in-circuit. Best to take them out, but on my tests C275 tested to 17.5uf and esr of >40 ohms, it tested the same in or out of circuit. >40 ohms is not good from what I understand. An esr value closer to zero or less is better. So I found the closest replacement capacitor I had on hand, just to see if the thing would power on and It did so immediately. I should replace all of the caps with proper replacements.
Donkey, if you can maybe you could post the actual values of the capacitors as some of them are not clear on the size and voltages required.
Thank you very much for the video. I have repaired my ASA5505 only replacing the C275 capacitor (22 uF/35V) with a higher voltage capacity capacitor (22 uF/50V)!
Thanks a lot! In my case it was C275. I heat the capacitor with a heat gun as shown on the original video, the board came up, but did not start again after cool down. To confirm, I momentary connected a 22uf/50v radial capacitor over existing, and the board start working
I am happy that the video helped you, and also the environment has one less Cisco ASA5505 in the landfill. Although Cisco boards use quality components, sadly caps will dry out after 5-10 years, and they need replacing.
This is exclusive and very useful video, thank you!
Hi, base on my experience i was repair this CISCO ASA5505 i received this item from my customer (No Power) i was completed my troubleshooting and replace few component in primary section and secondary section. Primary Section i was replace E-Cap C275 Component ID and capacitor value 22uF/35V . in secondary i was replace Capacitor,C307,C308 & CR25 ,this component i was measured in multi meter its was shorted. Once i replace the system is power On is working well, hope this will help. Thank you
I'm looking for the transistor (mosfet?) Q26... what is short-circuit on my ASA. On the package I could read C12W AP... - didnt found any datasheet for... - do you have the schematic ?
Pls can you make a video on cisco switch 3400 FS, if the power supply inside the switch is working properly but the circuit is not working..... how we can do troubleshooting
Another great video. Are those smaller smd tantalum capacitors 47uF 16V.. what is the 636? I saw reference to PWC but I'm not sure what PWC is.
Yes, the tantalums seem to be 47uF/16V. I would replace those most probably with 100uF SMD electrolyte caps, which are 0.2Euros and they can be almost directly solder back in place of the tantalum cap footprint. Also, the ESR of the tantalum caps is very low, so using a higher value electrolyte will kind-of compensate for the ESR difference.
636 is 63u (63 and 6 is exponent 10^6) = 63*1 000 000=63 000 000pF = 63uF
beware that capacitor marking 63M is not Mega, but it mean 63u (microFarad)
Sir, thank you for this video. I'm trying to get life to a VCR/DVD combo for a long time. I have replaced some diodes and the controller IC of the PSU... Also one funny measuring cap. Now I tried the heatgun trick and it came back to life ;) You say "the capacitors (mainly electrolytic and tantalum caps on this PCB) which have high equivalent series resistance when they are cold due to old age, since the electrolyte degrades with time." Can you clarify this? What happens with an old cap? Does it start to leak? Does the value change? Why it prevents to startup the PSU? A short or wrong value? I love your video's. Learned more with it then in 2 years high school ;)
To answer my own question. The PSU started when the caps where heated. When I measured with the scope, the DC looked very bad. Huge rimple. So at high freq, the internal resistance of the cap rises a lot. So it can't do it's work. When measured with a normal cap meter, it looks OK.
@@eddysmit Exactly, as you have noticed, one cannot really measure an old dried out capacitor with a standard meter. Instead, you will need an LCR meter, which also measures the so called ESR (equivalent series resistance) of the capacitor. Practically what happens is that the electrolyte, which is a liquid when the cap is new will slowly dry out, and get more viscous like paint dries with time. Due to the lower ion mobility the internal resistance will increase, and the capacitor will no longer behave like a capacitor, but instead behave like a capacitor put in series with a resistor, which is no good.
lpThank you so much for that tip... It help me remind me about capacitors becoming good when heated. I'm i correct? Good day
Great video
I had the same problem, i had to replace the 47uF cap and the 22uF, the device came back to life.
Actually the problem was with the 22uF one, I later found out
I am glad that this short video have helped out couple of people who were brave enough to replace the caps ;)
Good job! Enjoy your Cisco ASA for a couple more years.
hello Donkey Learning, you were right, the 20efd-u26 replacement make ma motherboard burn. As I had another motherboard of 5505, I order a capacitor C275. But before I try to use polarised capacitor 22 micro farad to put above the c275 without take it off the motherboard. And the asa turn on. I should received new capacitor and try to make video in English :) and we wi9ll see.
Again many thanks for you videos. ounet
Good to hear that your ASA is slowly getting better. I would replace all five caps, because when one is dead, the other ones tend to go dead soon after as well. Let me know whether you have managed to fix it.
Hi I have Cisco 5516 firepower device and it has a issue like the device has power on LED and status LED is amber also when i connect the LAN port is not showing UP
please help me out is possible
There’s a field service notice on the 5516 for failing. One field notice is due to a feeling clock in another due to feeling resistor which give you power on green and status Amber. The device becomes unusable. I just had one feel like this.You can verify your serial number to see if it was one of the affected. Three of the four ion have been affected.
Fail not feel....sorry for typo
I don't understand English speaking) pls write: 5 capacitors need to replace?
Replace first the electrolytic caps (aluminum housing). After this, if it did not help, replace also the tantalum caps.
Could you please make a short animation from powering up to voltage out about SMPS. Actually a animation how ac voltage travel via semiconductors and transformer and then DC output made. Waiting for your 3rd part of SMPS tutorial.
I was thinking about making something like that via Blender, but I am really bad with Blender, and I can so far make only basic shapes. Nevertheless, first one must go through the block diagram, otherwise even a good animation would not be very helpful. My third video is 70% done, but I am fully swamped in my job, and for the weekend I must take a brake. It will be done soon, and it should be an informative video on inductors.
Hello. today I repaired one of these problematic ASA5505. I found "a franch video" mentioned here and trying to warm up power section with hot air - without removing transformator... And whats suprise... unit light on. So after cool down unit returned to failed state, so I started to warm up every component near transformator. It looks like only one component went bad, electrolytic capacitor 22u35V on the border of the power section. I was simply replaced it with another non smd (22u/100V), there is planty of space to use it. I hope it can help to someone else :-)
I am glad you managed to fix it. As I said in this video, most of the time those caps will fail, and replacing them will fix the ASA5505.
This happened to mine too! Thank you for the clues. I never replaced a electrolytic capacitor 22u35v before.
All you need is a new cap, a soldering iron, little bit of flux, two tiny drops of solder, *and a lot of patience*
Joke aside, it is easy to replace it, just desolder, remove old solder with solder wick, solder new cap back on.
It should be ready to go, good as new!
Is there someone in Jeddah who can repair ASA 5505 power issue
I will pay him