Re: Ticking PSU
I used the black output wires for ground. The orange wire is +12V, the red - +5V
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Re: Ticking PSU
Alright, I think I found the problem.
I swapped the 47uF/400V cap with a 100uF/400 ( that's the only 400v which I have at the moment ) and the noise disappeared.
Also the ripples changed ( see attached ).
I tried to measure again the 47uF/400V but couldn't get a good reading this time. It looks like there is some kind of an internal failure.. probably one of legs is not getting good contact with its conductive plate.
So I guess the "ticking" issue has been resolved ( kudos to R_J ).
Do you think there is any point in continuing working on this to get better outputs?Attached FilesLeave a comment:
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Re: Ticking PSU
Here is the audio converted to mp3.
I desoldered and measured the big cap on the main side and it was within 10% of its original capacitance. Anyway, I will switch it with another one and test it again.Leave a comment:
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Re: Ticking PSU
I have no idea where that ripple is coming from but at 49Hz it must be from the primary, That power supply operates at about 30-50 Khz. So it could be that the main filter cap is bad, sometimes those large caps can't be checked properly with a meter, And it does look a little bit domed but hard to tell from the pictures.
I cant play m4aLast edited by R_J; 11-27-2018, 04:49 PM.Leave a comment:
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Re: Ticking PSU
All joints resoldered/reheated and the pcb cleaned.
Still got the same "ticking" and output ripple.
Here is a recording of the ticking and what I have on the output. Is this ripple acceptable?Attached FilesLeave a comment:
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Re: Ticking PSU
looks like the board needs a good clean and the dry joints attended to with fresh solderLeave a comment:
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Re: Ticking PSU
I thought it was not working, if the 5v and 12v are there then there is no short. The pictures are too small to really see anything.
The ticking without a load could be normal, Was it working before you changed the cap?Last edited by R_J; 11-27-2018, 02:18 PM.Leave a comment:
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Re: Ticking PSU
Well the PSU starts fine every time and produces both 5V and 12V.
I haven't noticed any excessive heat or smell.. what will be the best way to look for short without desoldering and checking each individual component?Leave a comment:
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Re: Ticking PSU
The ticking is caused by the primary trying to start but can't usually caused by a short in the secondary somewhere.Leave a comment:
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Ticking PSU
Hi everyone.
Can anyone help with a PSU which is making a ticking noise. The noise gets louder when load is applied ( it is still audible even with no load ).
The PSU is UOP325D-0512-A ( still have not found schematics ) and looks like the attached images.
I desoldered and measured all 6 electr. caps and 5 of them were fine. The faulty one was the green one ( right next to the 2 big ones on the low V side ).
Any ideas what could be causing the ticking?Attached Files -
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I have a Dell Latitude 5511 laptop, and lately, a faint but clearly audible electrical (crackling) noise comes from the motherboard, similar to the random clicking coming from a mechanical hdd's heads moving inside it.
The laptop shows no signs of malfunction, and clearly this is electrical not mechanical, so my suspicion goes to a dodgy component in the power rails (a capacitor or a coil?). I fear this could develop into a serious damage.
Any advise on how to narrow it down?
The schematic is available here:
Dell Latitude 5510 5511 - Precision 3551 FDV50 FDV51 LA-J282P... -
My XFX Core Edition Pro 450W power supply started making a weird ticking noise some time ago. Eventually, I figured out what the issue was, and managed to fix it. I purchased this unit back in 2012, so it's an old model, but I'm still posting this in case someone finds it helpful or interesting.
THE PROBLEM
The power supply started making an irregular ticking noise when running, but would otherwise work perfectly fine. The issue would sometimes come and go. A Google search for "xfx core ticking" found multiple other people reporting the same issue, so I assume this... -
Hi Folks,
Just wanted to clear up a misunderstanding of mine (or what I expect is one). Isn't the 12V rail from the 24 pin, EPS and PCIE separated? IE if I put a power resistor on the ATX 12V pin that is not going to load, thus tell me if the EPS or PCIE rails are fine?
I was recently watching ArIs from Hardware Busters video on how to properly test ATX PSUs without using 5 figure Croma substations.
The PCB adapter he used breaks out the 12, 5 and 3.3V pins from the 24 pin and gives you banana plugs to connect to. That is a bit useless is it not? Aren't... -
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