The power supply and inverter board are all in one. A 1000uf 25v cap has failed. I was wondering if I could replace it with a 2200uf 25v cap or a 3300uf 25v cap without damaging the board. Or should I replace it with another 1000uf 25v cap just for good measure..The only other cap I have that's close is a 1000uf 16v an I think I'm sposed to go UP in voltage an not down...
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Re: Monitor uF (/microfad) rating
1) Replace with the same uF and voltage. You can go up in voltage, not down.
2) For lcd monitors, they usually have a SMPS power supply which requires a low ESR (ohms) cap. A list of recommended caps are at
https://www.badcaps.net/forum/showthread.php?t=2280
3) PCBONEZ also teaches how to select a suitable replacement at
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Re: Monitor uF (/microfad) rating
4) I forgot to mention that most here will recommend that you replace all the capacitors except the largest one which rarely, but not never, fails.
Capacitors die from age, heat, and shoddy build quality. Capacitors DO NOT have to be visibly bloated in order to bad. They can be out of tolerance uF (a 1000uF measures 20uF) and/or have high ESR (ohm). A multimeter will be insufficient to test for ESR. For that you need an ESR tester which costs between $50 and $300.
Certain brands and certain series are known to be bad.--- begin sig file ---
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Re: Monitor uF (/microfad) rating
You CAN go down in voltage, but you first need to check the voltage present on the 1000uF 25v cap. If it's reasonably less than 16v (usually, 13v or less), then the 16v cap would likely be fine. Just make sure the voltage never goes over 16v and it should be no problem. I've done this many many times with no problems (after checking the voltage in the circuit first, of course).Originally posted by Solder View Post
Sometimes, power supply manufacturers will use a capacitor with a higher voltage rating because the caps for the higher voltage are physically larger. When comparing caps of the same manufacturer and series, this means that the higher voltage caps will also have lower ESR than their lower voltage counterparts. This is usually a cost-cutting move by PSU manufacturers.Comment
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Re: Monitor uF (/microfad) rating
If I had something to test the voltage to see what it was actually outputting then I'd stick the 16v cap on it...I got a 1000uf 35volt. But I had someone else put the cap on for me so I could prep the monitor to be put back together and he installed it backwards..the reverse in polarity caused the cap to vent within a minute of the monitor running. So now I gotta get another cap
This can be marked are resolved.
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