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Search: Posts Made By: momaka
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 01:02 AM
Replies: 18
Views: 1,272
Posted By momaka
Post KDMPower MIPC MI-X8775CD: load-tested and still running… for now (part 2)

After the above tests, it was clearly time to step it up. Unfortunately, my current load test setup with all the jumper leads was not longer up to the task. Clearly, I needed to make something that...
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 12:51 AM
Replies: 18
Views: 1,272
Posted By momaka
Arrow KDMPower MIPC MI-X8775CD: load-tested and still running… for now (part 1)

As promised, I did some load testing on this PSU. The results were better than I expected in some ways, and just as bad as I thought they would be in others. But before I go off digging in numbers,...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 09:00 PM
Replies: 9
Views: 101
Posted By momaka
Re: Moding a 120vAC smps to work with 220vAC

That wouldn't work.

Remember, 230V AC line peaks at +/- 325V DC (230 x sqrt[2]).

So by converting to half-wave, you would still get 325V peaks, but only on the positive or negative side of the...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 08:38 PM
Replies: 7
Views: 221
Posted By momaka
Re: Can a failed input smoothing capacitor destroy the switching IC?

No, safety Y1/Y2 caps are rated for only 250/400V. Snubber cap needs to be rated for at least 1 kV or preferably 2 kV.

Is there a letter written after its capacitance code? (i.e. 103J, or 103K or...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 08:19 PM
Replies: 15
Views: 432
Posted By momaka
Re: 1300W PSU - Help with replacement mosfet

Check the primary input electrolytic caps too. Usually blown APFC components is a result of the primary caps going either short-circuit or open-circuit / low capacitance. Not uncommon for these to go...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Yesterday, 07:24 PM
Replies: 9
Views: 317
Posted By momaka
Re: SIS 496 PCI Motherboard - working but only with graphics card in third PCI slot

:rejoice: Glad to hear you got it working!

I guess when in doubt, just reset CMOS again and again. :D
On the other hand, I wonder if it's a flaky BIOS or CMOS chip. I do have a few older...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Yesterday, 07:19 PM
Replies: 9
Views: 6,357
Posted By momaka
Re: Need ASUS Capacitor KZG 16v 1000uf

Those should work too. But just keep in mind Nichicon no longer makes the HM, HN, or HZ series. So anything you find on those will be NOS (new old stock.) If these are over 5-8 years old in storage,...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Yesterday, 07:16 PM
Replies: 31
Views: 4,798
Posted By momaka
Re: Gigabyte EP43-UD3L stuck in POST

Well, don't chuck them in the trash. Some of these old GPUs' value will increase in time as they get more rare, even if they are low end. Also, low-end for current gen could be top-of-the-line for...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 06:53 PM
Replies: 14
Views: 1,175
Posted By momaka
Re: Asistance required on troubleshooting Corsair CX500

Most of the time, no. Like linuxguru, I find 85C -rated parts quite frequently - especially on cheaper/budget units. 85C caps for sure means they are GP and not low ESR. And even when I see PSU with...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-26-2021, 11:56 PM
Replies: 18
Views: 1,272
Posted By momaka
Arrow KDMPower MIPC MI-X8775CD: assembled with input filter (v1)

OK, so I was cleaning up some of my other open/unfinished projects the other day and decided to put this KDMPower PSU back together too. Surely I could solder the input wires and slap it shut again....
Forum: Troubleshooting Power Supplies and Power Supply Design 02-26-2021, 11:33 PM
Replies: 2
Views: 123
Posted By momaka
Re: Ultra 350w ATX Power Supply

Looks like a Young-Year PSU (and probably is, since Ultra did use that OEM for some of their modular series, if I remember.) Though, it could also be (and likely is) a WinTech, judging by the "WIN"...
Forum: General Computer & Tech Discussion 02-26-2021, 10:27 PM
Replies: 22
Views: 2,288
Posted By momaka
Re: Topcat's Other Misc Weird Build Thread

Man that sucks for sure!


Yeah, I was about to say, wouldn't it be possible to still sell the system without the touch screen?
If there was no non-touch version, I probably would have attempted...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-26-2021, 10:04 PM
Replies: 31
Views: 4,798
Posted By momaka
Re: Gigabyte EP43-UD3L stuck in POST

Is this board powered from the Antec PSU you just posted about recently with bad 5VSB? If so, maybe the PSU just has more bad caps. Also, being an Intel board... any chance you are running a stock...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-25-2021, 11:11 PM
Replies: 8
Views: 279
Posted By momaka
Re: Modding Two PSUs to Output 12V

Yeah, when working on PSUs - be it modding or just probing voltages - always have it plugged in to a series current/power limiting device, such as an incandescent light bulb or two (or a more...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-25-2021, 09:39 PM
Replies: 27
Views: 1,339
Posted By momaka
Re: junky Jetway P4MDPT board

Yeah, monitor PSUs use flyback topology, so caps with high ripple current specs would be desirable. Probably better to slip in a few more Nichicon HD 680 uF in there in place of some of the VYs, as...
Forum: General Computer & Tech Discussion 02-25-2021, 09:24 PM
Replies: 71
Views: 7,282
Posted By momaka
Re: The (now the death of) Dolby DP600 Build (OK, this one is BEYOND COOL)

Lol! I sense this will never get finished if you keep getting more/new parts. :group:


I see you found a small TFX PSU for the machine I sent you. Well, I promised I'd look for a matching PSU...
Forum: General Computer & Tech Discussion 02-25-2021, 09:08 PM
Replies: 22
Views: 2,288
Posted By momaka
Re: Topcat's Other Misc Weird Build Thread

Wow, that looks pretty bad. Perhaps this was in a basement or some other low area that got flooded? The "water line" on the corroded base seems to indicate so... though it could also have been a...
Forum: General Electronics Technical Discussion 02-25-2021, 03:21 AM
Replies: 12
Views: 492
Posted By momaka
Re: Drilled motherboards

If the motherboards have an SSD or other storage soldered onto the motherboard (such as tablets and many of the modern ultra-thin laptops), then that's probably the reason why... which is silly,...
Forum: General Capacitor Questions & Issues 02-25-2021, 02:53 AM
Replies: 5
Views: 366
Posted By momaka
Re: Cap availability problems

Rubycon YXJ and ZLH series are also available in that size.

I like the YXJ for entry-level low-ESR, like replacing those Teapo SEK caps. Such entry-level low-ESR caps are usually employed in PSUs...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-25-2021, 12:51 AM
Replies: 9
Views: 6,357
Posted By momaka
Re: Need ASUS Capacitor KZG 16v 1000uf

For PC motherboard use, no, this wouldn't be a problem.

Those 16V 1000 uF KZG caps are typically used to filter the 12V rail for the CPU VRM. So if yours are somewhat close to the CPU heatsink,...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-25-2021, 12:47 AM
Replies: 3
Views: 292
Posted By momaka
Re: Asus A7V8X hdd issue

Yup, that's a classic failure mode for KZG, especially those 3300 uF ones: capacity goes through the roof and much higher than the 20% allowable spec. This is a sign that the capacitor electrolyte is...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-25-2021, 12:31 AM
Replies: 2
Views: 1,425
Posted By momaka
Re: Asus EN8600GT

Are you missing the same two capacitors? If not, please state what other issue(s) you're having with your card.

Also, front and back pictures of your video card would also be very helpful so we...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-25-2021, 12:16 AM
Replies: 22
Views: 673
Posted By momaka
Re: Corsair AX850 low 12v and 5v voltage with random reboots.

Congrats on the fix, Psychedelic!

Where was the faulty cap located and what kind of cap was it? SMD? Through-hole? Just curious to see if this could be some kind of wide-spread failure or just a...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2021, 11:36 PM
Replies: 8
Views: 279
Posted By momaka
Re: Modding Two PSUs to Output 12V

I hate to be a negative nancy, but I don't think these mods will work too well (if at all), because you're trying to change the voltages a bit too much. The reason I say this is because the main...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2021, 11:17 PM
Replies: 11
Views: 6,716
Posted By momaka
Re: Replacement cap advice needed for Panamax Max 1000+ Surge Protector/Line Conditio

Could we see some high-res pictures of your unit, particularly of the affected part? (But also of the entire board too, if possible. The pictures from the orginal poster are really too small for me...
Showing results 1 to 25 of 500

 
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