Re: Antec BP500U APFC Coil
Thanks, @kaboom, I'm pretty certain the MOSFETs and other associated semiconductors are blown since that happened 10yrs ago when the PFC cap went bad. I don't remember having any issues sourcing suitable replacements for the semis, but the PFC coil might be a show stopper.
GnatGoSplat
Senior Member
Last Activity: 08-09-2022, 03:42 PM
Joined: 07-06-2011
Location: Battlefield, MO USA
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Re: Antec BP500U APFC Coil
Thanks, there are a few pics of a BP500U in that thread, but I can't see the core color through the windings. Other FSP PSUs in that thread had a blue core, but from what I can tell on the one pic I have from a "before" shot of a previous bad cap repair, the core on mine is a yellowish color or pale green, not sure. It's unfortunately, the best pic I have that shows the coil in a healthy state.
I'm not sure I want to wind my own. I hadn't been too successful with that in the past....Leave a comment:
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Antec BP500U APFC Coil
Antec BP500U PSU fried in my wife's gaming PC. I smelled something unpleasant last night, so I had a hunch something might be amiss. Woke up this morning to a popped breaker and immediately assumed the APFC cap must have blown. I last fixed it sometime in 2011, there's a thread about it here someplace. APFC and secondary caps that time. Replaced them with Panasonic caps. 10+yrs is probably a good run. It's been running 24/7 the last 3yrs, eth mining with a 1070ti and AFK fishing in Black Desert Online, lol.
Anyway, cracked it open this morning, expecting it to just be the APFC cap...Last edited by GnatGoSplat; 11-02-2021, 09:24 AM. -
Re: Panasonic SA-XR50 (similar to XR70) receiver F76 error
I did. I pulled off several PSU caps to test out of circuit, and even a few not in the PSU, but they all tested good for ESR and capacitance.
Strangely, I put it back together, and all was fine for many months. Several months later, there has been a couple random times where it got F76 and shut down on its own, but I'd turn it back on and it'd be fine for several more months. It's used daily for several hours a day. I'm leaning towards oxidized contacts in the ribbon cable connectors. If it ever gets worse,...Leave a comment:
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Panasonic SA-XR50 (similar to XR70) receiver F76 error
I have a Panasonic SA-XR50 A/V receiver that's been in daily use 15-years. Suddenly decided to display F76 error on VFD and shut down. It happens every time I power it on since then, after a random amount of time (seconds to minutes). Seems to function normally until it shuts down. PSU makes occasional faint, but barely audible chirp sounds randomly, not repeatedly. F76 indicates power supply issue. Suspected bad caps, but all caps appear visually normal. All electrolytics on PSU board appear within ESR spec when tested in-circuit.
Anyone come across a similar issue in one of these,...Last edited by GnatGoSplat; 12-30-2018, 03:36 PM. -
Re: Samsung 305T - Video Distortions
I picked up one of these on an impulse buy.
It had purple lines in the image, image flickering, and intermittently turning green.
I've made an amateur attempt to reflow the BGA using a cheap SMD hot air station and some flux. Managed to succeed on first attempt. Main concern I have now is preventing recurrence of the problem.
Those who have added additional cooling, has the problem reoccurred?
What type of cooling did you add on (active/passive), and how long did it last?Leave a comment:
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Re: samsung 305t caps bad?
I have a 305T which I suspect has the same problem. I do have a hot air rework gun, but not much experience using it. Anyone have any suggestions on what temperature I should use, how far away from the Altera chip I should point it, and for how long?Leave a comment:
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Re: Replacement for 8mm diameter CapXon KF series
Thanks! I think I'll go for the Panasonic FR. 9000hrs@105C.
Yeah, I've read that cap leads should be kept short as possible due to inductance.Leave a comment:
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Replacement for 8mm diameter CapXon KF series
I need to replace some CapXon KF series capacitors which are 8mm in diameter on an Antec BP500U PSU. I believe Nichicon HE is the closest electrical equivalent, but they don't come in 8mm diameter. I'm afraid to use HM because I don't want to increase ripple.
Are there any good caps that cross to the KF series that are 8mm diameter for 1000uF 16V?
I suppose I could use 10mm caps if the leads are long enough, they would have to be suspended above the other components because they wouldn't fit where the original caps used to be. I noticed the secondary caps are pretty... -
Sony/Delta 295W PSU, datasheet for DWA101N N141?
I have a Sony/Delta 295W PSU, good +5VSB. No fuses blown, no switchers shorted, no bloated caps. Just won't come on. PS_ON traces to a 14-DIP labeled DWA101N N141. Anyone have a datasheet for it? I can't find any Google hits that are useful. -
Re: Increasing PSU output capacity?
I did try to restore the old Mac, but the motherboard is shot. The PRAM battery had leaked out and eaten away a bunch of vias and traces. I repaired the traces and vias which made it boot up, but it has weird errors, so something is not quite right.
Anyway, I had thoughts of mounting a low power Mini-ITX motherboard in it and running that off the original PSU in an effort to recycle as much original hardware as possible and also a cleaner internal appearance with everything mounted in stock locations. Even if I could reuse the PSU,...Leave a comment:
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Re: BK Precision 1665 variable SMPS
Huh, I guess if it's cheap crap, I'm glad it didn't cost me much! My old linear unregulated PSU from the 1960s only uses around 7-8W with no load which I thought was a lot.
I actually couldn't find the main fuse. I don't remember if I just misplaced it or chucked it thinking the fuse rating would be on the rear label, but it wasn't. I tried a 1A fuse which it promptly blew, so I found a 5A fuse that works.Leave a comment:
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Re: BK Precision 1665 variable SMPS
Finally got around to picking up a 200W bulb. It powered right up, never even saw the bulb glow, so looks like that was it. I replaced it with a fuse, and all is well.
Odd thing is, being an SMPS and also having APFC, this PSU is not particularly efficient. It seems to be using 10-11W at all times even with no load. That made me wonder if something is not quite right, but I didn't notice anything getting unusually warm inside. Heatsinks all stay pretty cool, and regulation works fine when testing the voltage display against my multimeter....Leave a comment:
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Re: computer not turning on. How to ID bad power supply w/o buying new one?
Are you saying that it does actually turn on, just doesn't boot or display video and only beeps? Is there any pattern to the beeping? It might be bad RAM. Bad RAM can cause a machine to turn on, but not display any video and just beep. It can also cause BSODs when the problem is less severe. It's rare, but I've experienced RAM just going bad before.
If it has 2 DIMMs, try pulling running one at a time and see if the machine will boot up. If you have only 1 DIMM, try swapping it with RAM from...Leave a comment:
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Re: BK Precision 1665 variable SMPS
Decided to pull the input caps and test them. Capacitance and ESR test good.Leave a comment:
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Re: BK Precision 1665 variable SMPS
Pics attached.
The part that looked like another SMPS to me is actually the APFC circuit. I didn't expect this kind of PSU to have APFC, but I ran the P/N of the 8-pin DIP (MC33262) through Google and it's a PFC controller, so now things make a bit more sense to me.
I checked all the output rectifiers and none were shorted.
Could bad input caps cause this? They are CapXon which I've had some bad experience with on PC PSUs. I had an APFC PC PSU that blew the MOSFETs when the CapXon input cap went bad. However,...Leave a comment:
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Re: BK Precision 1665 variable SMPS
It uses a TL494CN for the main SMPS. However, there is something that appears to be another SMPS and large transformer with a large TO-3P package MOSFET and TO-220 rectifier. It almost looks as though the output of it drives the input of the 2nd transformer. I'm not positive though, as I get a bit lost following all the traces.Leave a comment:
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Re: BK Precision 1665 variable SMPS
I'll check when I get home.
From what I could tell, it's not quite as simple as a PC PSU. The MOSFET gates are driven by a pair of transistors which is driven by the output of a small transformer. The driver transistors themselves were okay, but the zeners near them were shorted.Leave a comment:
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Re: BK Precision 1665 variable SMPS
Yeah, it's behaving a bit differently than when I've used the bulb on PC power supplies. Usually the bulb lights up briefly and then dims down and stays lit dimly.
This is going to 100% brightness, shutting off abruptly, then 100% brightness, and repeating. Like flipping a switch on and off. I wondered if it could be a protection circuit kicking in or something.Leave a comment:
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Re: BK Precision 1665 variable SMPS
I see. So you think the bulb blinking might just be a repeating pattern of the capacitor charging up and then the PSU shutting down?
I'll see if I can pick up a 200W bulb over the weekend.Leave a comment:
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