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).
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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Normally, I never post repairs this quick after I do them, because… I am usually very slow.
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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When I tried to repair LG 29 inch CRT TV, I found that the ESR value of samyoung SMS capacitor(160v 2.2uf), which is very close to D1879 transistor, is 6 ohm.
Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
Rubycon YK DataSheet (b... -
I have a Samsung U32D970 monitor from 2015 I pulled out of the bad hardware pile that turned on and then turned itself back off after a few minutes of use and refused to turn back on. The PSU has part number BN44-00786A, and I found a couple posts about one that had blown with damage to the MOSFETs and PWM controller - but nothing about intermittent failures. I started a new thread and said that I would refresh the solder joints on the board to see if it was just a bad connection and possibly replace the PWM and PFC ICs. I then asked what my next course of action would be after those steps. I... -
Hi Everyone
Lately I am experiencing the deja-vu incident on one of the led monitor like this.
https://www.badcaps.net/forum/troubl...lashing-on-off
The monitor is HP 27es LED Monitor
https://h30434.www3.hp.com/t5/Deskto...e/td-p/6804692
The monitor will randomly blackout and display no signal and will recover again.
Sometimes need to power and off again to restore the display but... -
Good evening, gentlemen.
I have a problem with my monitor. It turns off after a few seconds or flickers. Shining a flashlight on the screen doesn't show any image, so I guess it's not the "2 seconds to dark" I read in the forum.
To turn it back on, I have to press the power button twice. Then after a few seconds it turns off again or flickers. See video.
https://drive.google.com/file/d/1L6S...ew?usp=sharing
Things I tried
- Bought a new AC adapter thinking that was the problem but the problem...
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