Re: Power supply build quality pictorial. part 2
Looks like a filled up Deer (full input filter and nothing seems to be omitted). If you fully recap this L&C/Deer (upgrade the primary caps to at least 470u for 250W if you have any laying around). Even if this has a 35 size transformer, the somewhat scrawny heatsinks themselves, the classic half-bridge design, and the single 80mm fan will limit this supply at 250W continuous....
pc7fan
Badcaps Veteran
Last Activity: 07-17-2024, 07:06 PM
Joined: 08-31-2013
Location: Maritimes
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Re: How to Recondition (Reform) Electrolytic Capacitors and Why
Usually, bipolar electrolytics are intended to be used intermittently, unlike film/oil caps. this is mainly due to them usually having higher ESR. Remember that they're simply back-to-back electrolytics, with either the anode or cathode internally merged, like Redwire's post shows.
They use large canned bipolar electrolytics in induction motor starters because of the following:
* they're cheaper than film/oil for the same capacity, at the cost of higher ESR (hence heat, then they pop...Last edited by pc7fan; 04-19-2022, 12:03 PM.Leave a comment:
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Re: Replacement cap for Samyoung NXB
AVOID Panny FCs. They sometimes leak from the negative terminal and will damage/corrode the traces if not caught quickly.Last edited by pc7fan; 01-21-2022, 06:39 PM.Leave a comment:
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Re: 4700uF 6.3v and 3300uF 16v in a 10mm Diameter
SMG is a fine choice, but remember that estimated lifetime doubles each 10 degrees Celcius less. KMG then should technically have double the lifetime than SMG at 4000 hours at 85C, if other factors are the same. KMG is the high-temperature variant of SMG....Leave a comment:
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Re: 4700uF 6.3v and 3300uF 16v in a 10mm Diameter
They used KMG for a reason, those aren't areas that require high ripple current, thus 105° GP caps deem appropriate for decoupling. I have also seen good 10mm 16/3300 and 6.3/4700 Fuhjyyu TN that indeed tested around 3300 and 4700 respectively in old SP Antecs and Apevias. Since Fuhjyyu TN are general purpose, reducing to 3300u low-Z caps shouldn't be an issue whatsoever, plus that may reduce the risk of oscillations and will roughly match in ripple current ratings.Last edited by pc7fan; 10-19-2020, 05:27 PM.Leave a comment:
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Re: Blown cap
Indeed, I've also seen failed Taicon primaries. I have actually seen more failed primaries than secondary caps from them. I would say failure rate for primaries is about on par as with Samxon, especially if in APFC....Leave a comment:
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Re: Panasonic FC series - leaking? quality gone?
I would vow Taicon (Nichicon, Taiwan) as a 2nd tier brand, along Samxon and SamYoung (NCC, Korea), excluding the faulty series. They are arguably decent and they seem to be consistent - lifetime wise. I have seen tons of Taicon and Samxon survive (with OK specs) beside failed CrapXon and Ltec in Delta supplies. Also seen Su'scon fail while the SamYoungs test fine in LG TVs with repetition, so it seems to me that it's not just luck. Regardless, the Japanese brands are where the reliability is at....Last edited by pc7fan; 10-06-2020, 08:52 PM.Leave a comment:
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Re: Replacement Chemicon SMG caps
FR is an aqueous series AFAIK, similar specs to HE. All very good caps. Since this amp used SMG, I would preferably stick with the same class of caps, but using higher temperature variants. KMG, NHG and VZ would be most appropriate choices for the intended design....Last edited by pc7fan; 09-24-2020, 06:18 PM.Leave a comment:
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Re: Panasonic FC series - leaking? quality gone?
It is indeed a non-aqueous series. Regardless, if a cap catches fire in a power supply, something's seriously wrong :P...Leave a comment:
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Re: Panasonic FC series - leaking? quality gone?
Seen that notice from NCC. LXJ is not as prone to leak from the bung as the noted ones.. but when they leak, they wreck PCB traces just like the others. The only brand from that era that I don't see pee on the board from the bung are Pannies, even HFQ.
Even then, rubber does decompose after decades. It doesn't help when ammonia/ammonium attacks rubber and some plastics, expediting the process....Leave a comment:
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Re: the gutless, bloated, and fried power supply hall of shame
Always brown. Same with KMM, KMQ and KMG....Leave a comment:
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Re: the gutless, bloated, and fried power supply hall of shame
What a ridiculously underseized transformer. Like Pete, I would say 150W continuous... Unless you swap it with an EI33 or even an 35/39. These half bridge supplies are very similar between models and the tranny pinouts are usually similar. Until then, 150W continuous without the tranny melting itself.Last edited by pc7fan; 08-26-2020, 09:26 PM.Leave a comment:
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Re: Panasonic FC series - leaking? quality gone?
Am wondering as well. I've also seen a few FCs leak in older GM/Ford ECUs. likewise Nichicon PF/PL/PR, NCC LXF/LXJ leakers that I can remember that I've seen in many 80s/90s old electronics. Does anybody know if FC uses quaternary ammonium salts or something related like the early Low ESR from that era? Am aware that FC is non-aqueous.Leave a comment:
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Re: DC Power Supply QW-MS605D
I have an MS605D here. Replace the P75NF75 FET and that should fix the cap popping and cycling issue (use 100V output caps instead of the 63V ones).Leave a comment:
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Re: QW-MS3010D 30V 10A Variable PSU Blown MOSFET
The PSU design itself is OK, it's the parts that are not adequate for its rating, but after doing my modifications, it can deliver its full 300W and can short it without breaking anything. It was built down to cost but as a basic bench PSU, it's fine as long you know its limitations (there are many). In stock form, I wouldn't run the supply or any of its variants over 150W continuous.Last edited by pc7fan; 06-20-2020, 09:16 AM.Leave a comment:
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Re: QW-MS3010D 30V 10A Variable PSU Blown MOSFET
Yes, it is. Yes, you can put them in series. However unground the outputs.
Another common problem with these power supplies is the P75NF75 linear regulator FET fails D-S. (makes the supply lose regulation and mashes the output at 100% power)
These supplies are alright after you know their quirks...
The way you can cause that FET to fail is...
1. When you short the output when you set the voltage too high, hence dumping the supply's cap into the linear regulator FET, shorting...Last edited by pc7fan; 06-18-2020, 08:14 PM.Leave a comment:
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Re: QW-MS3010D 30V 10A Variable PSU Blown MOSFET
I have an QW-MS605D (same basic circuit as the 3010D except for a few components) the IRF840s in mine failed while running a 200W load. While it failed, it took out Q4, Q5, Q6 and Q7 - as well as the gate resistors. They are 47 ohms as well. The KA7500 was unharmed, and used some salvaged 2SK2915s from an old Delta PSU instead of more IRF840s. It now can do its full 300W without the primary FETs failing.Leave a comment:
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Re: Another custom C(r)apXon in FSP unit!!
Seen 16V 470uF custom CrapXons in 6.3x20 in FSP too, got to love it...Leave a comment:
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Re: Identifying reason for board's similar caps, but different physical sizes
Sacon? Rebadged GSC, garbage caps. Glad the PSU is working after the repair.Leave a comment:
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Re: The Hall of Shame - Badcaps Photo Montage
^
Seen plenty of bad WB series caps, they also fail open without any visible signs as well. Replace all of these caps, not only the bulged/leaked ones.Last edited by pc7fan; 02-05-2020, 10:25 AM.Leave a comment:
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