Already Replaced Cap- Blown again

[audrey]

Hello,
This is my first post on badcaps.net I have an Acer AL2216W that had a bad cap (bulging on top) I replaced all caps and a week later the same one that failed, bulged again & now there is no power again. I seem to have this problem with Acer monitors more than any other. I replace the caps, and the same one always fails within a week. The replacement cap I used is a JakeC 10v 1000uf.
I also repair several hp 1706 monitors & many times the same three caps will fail after a month & it is always the three 10v 1000uf. Besides JakeC i've also used nichicon and maxcap. Its been suggested to instead use a 16v 1000uf to replace the 10v on the HP monitors. I just tried that on an hp1706 and so far it is holding up okay, but it has only been a week.

Has anyone else had a similar issue? Any suggestions?

I added pictures of the joint, cap & board.

[mariushm]

Re: Already Replaced Cap- Blown again

JakeC is crap. Maxcap is probably crap. Nichicon are good but it depends what capacitor your put there.

You can't just put any capacitor that has that exact uF and voltage value.

The capacitors HAVE to be Low ESR, and ideally you have to use a series that has long life, because the capacitors are inside the case and they stay warm while the monitor runs.
Temperature is one of the major reasons capacitors go bad, besides being run outside their specs.

Capacitors with longer life are usually in bigger sizes. Capacitors rated for more voltage are usually also larger.

If there is room on the board, you can keep the capacity value the same (1000uF) but use capacitors rated for 16v or 25v, maybe even 35v.
BUT THEY HAVE TO BE LOW ESR.

Since you are in US, you can easily buy from this site the proper capacitors, or from Newark.com , Digikey.com, Mouser.com .. they all carry various capacitors.

Panasonic FM, FR are good and rated for very long life, Nichicon HM would be suitable.

And you don't replace just the one that's going bad, you replace the ones near it as well.

Unless you know for sure the bad capacitor is independent of the others by analyzing the circuit, it's possibly that the old capacitors are not working properly so the new capacitor has to do all the work and will die prematurely.

[retiredcaps]

Re: Already Replaced Cap- Blown again

When you are replacing caps on the power supply (SMPS), low ESR capacitors are required.

For example, Panasonic makes FR and FM series and both are low ESR capacitors.

edit: mariushm can type faster than I can as his post is 2 minutes earlier than mine.

[yakideo]

Re: Already Replaced Cap- Blown again

When you are replacing caps on the power supply (SMPS), low ESR capacitors are required.

Just to clarify to why you need to use low ESR capacitors. Using low ESR capacitors prevents for example LDOs to oscillate, generating more heat and in turn damage that caps due to high temperature.

[katzcaps]

Re: Already Replaced Cap- Blown again

I recapped that exact monitor, maybe 6 months ago & am using it right now. I suggest that the inferior cap quality is the culprit as mariushm suggested.

Replace with a Nichicon or Panasonic, go to 16V (there is room) and you will have one fine working monitor.

[audrey]

Re: Already Replaced Cap- Blown again

Thank you all for the your response. I showed the replies to my supervisor who has since purchased better caps (good brand names that are listed on here & low ESR)

Thanks again!!