i came across dead seasonic prime psu with shorted mlcc caps on the modular board, this is the third time i encounter this problem, i usually just removed the shorted mlcc and not replace them since theres a lot of caps around the psu i used to think those mlcc probably does not matter much, i have no equipment to test or proper knowledge for this. i just reuse those psu on low end machines. but few days ago one of the machines have its 2 sticks of ram died, it keep on getting blue screens. 2 sticks of ram died at the same time, its probably something else and not just the ram. in the past when a board kills ram its usally a sign of a bad filtering cap on the memory vrm, but the board uses solid caps, so im thinking those mlcc that are removed from the psu may have increased ripple? if so what value of caps should i be using to replace those mlcc's? will a 10uf 16v electrolytic be fine?
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Re: psu mlcc
like you said, ram has it's own regulators - so i'm not sure the psu caused it -
Re: psu mlcc
The MLCC's are there probably for suppressing high-frequency EMI/RFI - something the electrolytic/solid polymer caps may not do, due to much (relatively speaking) higher ESR. So adding small electrolytic capacitors in place of the MLCCs is pointless.
That being said, the removed MLCCs very likely aren't responsible for the RAM dieing. Indeed RAM has its own voltage regulation system (sometimes multiple buck and linear supplies in cascade), so any voltage spikes from the PSU don't have a chance of making it to the RAM at all.
Of course, if you still want to replace the MLCCs for piece of mind, use same or similar values. I'm not 100% sure what values to expect these days given a certain size for an MLCC... and it will also depend a lot on the voltage rating of the MLCC too. But in any case, 16V, 25V, or 35V MLCCs of 1 to 10 uF will probably match very closely to what was in there before (that is, if you have no way of removing any of the remaining MLCCs and measuring them.) If you have any scrap motherboards or video cards, you can pull such MLCCs from near the CPU area - just make sure to use the ones that are connected to the 12V rail for the CPU, as those are probably rated for 16-35V. The ones connected to CPU V_core may only be rated for 6.3V or less and likely will self-destruct if you connect them to the 12V rail.Comment
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Re: psu mlcc
I can't believe a SS Prime would have this problem. They've been nothing but awesome with meCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM meComment
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Hi
I have a QN65QN90A which was purchased around launch I guess making it about 1.5-2 years old... had been working fine until a few days ago, simply went black and would no longer turn on (at all). No standby light and no typical PSU relay click etc. Absolutely dead.
Pulled it apart without doing much research first, suspecting the power supply as it had a faint buzz (I guess due to the forthcoming found short), investigated PSU for some time and concluded there was no fault that I could spot with the board removed.
Came to learn after a bit more research... -
Hi All,
I bought some used Xbox one controllers "as is/untested" and they both have the same issue. The joysticks go wild for no reason while plugged in.
https://youtube.com/shorts/YTYtjUPkBX0?feature=share
I removed both joysticks assuming it was an issue with the sticks, but the video posted here is the activity of the sticks with no sticks installed! My only guess is one of the tiny IC's that reads the inputs is broken. There are two small ones near either joystick, and then one larger one. I found a replacement on Aliexpress for the larger one... -
asrock h410m-hdv
I wonder the resistance value of the mlcc capacitor between atx24 pin and usb3.0. -
Just as the title states. Two cheap SiS machines, surprisingly stable.
What I will tackle in the near future (the build will be slightly postponed due to slight stomach issues - am still recovering and my physical power (sorry if it sounds weird,English isn't quite my primary language) isn't the best at the moment. Especially with the diet I have to take at the moment.) are two SiS based machines.
The first one is a IPC rebranded Mitac 7521T. Why did I feel the need to tackle this machine? Well, just look at the specs:
CPU - P3 1100MHz Coppermine... -
good morning all,
i purchased a used dell e6540 laptop used 10 months ago from a vendor on ebay. intel i-7 processor, 16 gb ddr3 memory, 256 gb ssd., mobo la-9413p (rev 1.0 dated 2014-08-04). i've inflicted no damage on it since purchase but its past is unknown. starting 2 weeks ago it began to fail to boot (initially 9 of 10 boot attempts failed, now 10 of 10 fail). there was no new hardware or software added (i was using as a kodi video server). the post process doesn't complete and booting no longer displays the dell logo screen - screen remains black with no backlight. some other...
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