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ben7
ben7
Capaholic
Last Activity: 02-14-2021, 07:37 AM
Joined: 01-04-2011
Location: Trenton, NJ
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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Another Supernight

    Another day, another Supernight!

    This one is also popped - blown fuse, shorted primary FET, and blown caps (see below). The case was slightly melted, but I didn't bother photographing it as it's nothing unusual now.

    Surprisingly the 68µ cap measured about 70µ. I wouldn't be surprised though if the ESR is a bit high - it's likely dried up somewhat.
    The PWM electrolytic (rated 47µ) measured about 2µ, and after just a moment the meter began freaking out, autoranging back and forth.
    The popped 1000µ measures only...
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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame

    Thank you for the warm salutations, momaka and goodpsusearch.


    It uses a real Y1 type capacitor, according to the cap itself. It's only 2.2nF, which may explain the small-ish physical size.
    The transformer also doesn't use doubly-insulated wire for the secondary, so it still likely wouldn't pass.

    ~~~~~~~~~~~~~

    I was "gifted" two more of those "SUPERNIGHT" W-T5000 adapters.

    It turns out, they [B]INDEED[/B] are using [B]recycled/re-sleeved...
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    Last edited by ben7; 02-05-2021, 09:31 PM.

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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame

    When will it end?!... When your business burns down, in fact.

    I was told that the fire department was called out for this one, as the employees heard a "strange noise" and smelled something burning!

    Amazingly, the fuse is not blown, despite *every* electrolytic cap being blown, and the case seriously warped/melted!
    It appears the large capacitor also blew, and sprayed electrolyte, which dried/crystallized on the case and some components.

    "DC...
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    Last edited by ben7; 01-17-2021, 09:52 PM.

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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame

    Yet another faulty 12V 5A PSU ... this one has some absolutely [I]filthy[/I] solder!

    "AC/DC ADAPTOR"
    "TS5-6W"

    100-240V 50/60Hz 1.8A
    12V 5A

    Rectifier: 4x 1N5408
    Controller: OB2269CP
    Primary FET: Toshiba K11A60D
    Secondary rectifier: SIRECT MBR20100FCT
    Primary cap: 100µ 400V, "LH.Nova" RX
    Controller cap: 22µ 50V "LH.Nova"
    Secondary caps: 16V 1000µ "LH.Nova" LE (popped),...
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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame

    This one is not the worst out there, but it's pretty darn shameful I'd say!
    (Will give you a "super-night" when it burns your house down!)

    "Supernight"
    "AC/DC ADAPTER"
    "W-T5000"

    Input [I]"VOLTAGEDE"[/I]: 100-240V 50/60Hz 1.6A
    12V 5A

    Rectifier: KBP310GL
    Controller: UC3843AN
    Primary FET: FQPF5N60C (Looks like it's been tossed around...)
    Secondary rectifier: STPS10H100CT
    Primary cap: 68µ...
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    Last edited by ben7; 01-16-2021, 04:17 PM.

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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame

    Channel Well Technology
    KPL-060F

    100-240V 50/60Hz 1.7A
    12V 5A

    Rectifier: ??? (Hidden, didn't bother to unsolder heatsink, but looks like same package as KBL40x types)
    Controller: "MWP 36R 55"
    Primary FET: 10NK60Z
    Secondary rectifier: SBR20U60CT
    Primary cap: 120µ 400V, Su'scon
    Controller caps: 22µ 35V and 4.7µ 50V, Su'scon
    Secondary caps: 2x 16V 1000µ SAMXON GK (blown), 1x 16V 220µ SAMXON GF (Left it in as it's after the...
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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame

    This PSU is not that bad, however, it came with a fatal factory defect ...

    "AC ADAPTER"
    "TS5-6W"
    [I]"Trained Service Personal Only."[/I]

    100-240VAC 50/60Hz 0.8A
    12V 5A

    Rectifier: GBU808P
    Controller: CR5842B
    Primary FET: AGM12N60F
    Sync Rect Controller: 1('I'?)9HMA
    Sync Rect FET: 085N10
    Primary cap: 82µ 450V, (Brand is "H." in a circle)
    Controller cap: 22µ 50V, "BH"...
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  • ben7
    replied to The Hall of Shame - Badcaps Photo Montage
    in General Capacitor Questions & Issues
    Re: The Hall of Shame - Badcaps Photo Montage



    Take a look at how wide open the vent is. I'd say it suffered a sudden, violent failure.
    That's not the first time I've heard of big filter caps going in a NAD amp..


    Look closely at the big filter/regulation choke hiding behind the wires. I think it has smoked, has it not? Looks a bit dark/burned.
    I'm betting that it may have had something to do with the capacitor failure, causing the choke to run hot. Once hot enough, it probably develops a short (or looses magnetic properties) in...
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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame



    Is it just me, or has that "2003" control IC gone poof?

    -Ben

    P.S. Looks like you struck gold ... er, brown, crispy gold.
    Those cheapo PSUs are probably good for 200W max, and even then that is pushing it, especially if you are drawing more than 5 or so amps on the 12V. (For the 2-diodes-on-a-bracket type)

    As for the one with the bloated primary caps ... you should possibly check the leakage current, and the balancing resistors....
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  • ben7
    replied to Pioneer Speaker Package subwoofer transformer.
    in Troubleshooting Audio Equipment
    Re: Pioneer Speaker Package subwoofer transformer.

    Something like this may work. Dual primary (117/234V), 48V @ 4A output, center-tapped (so it's 24V-0-24V).
    [url]https://www.mouser.com/productdetail/hammond-manufacturing/266n48?qs=sGAEpiMZZMvwUzoUXIIvyW8HfC4QLhUeQoM4NQfOLcs%3D[/url]

    But, it's almost $100 and weighs 8 pounds. (Shipping would be expensive.)

    -BenRe: Pioneer Speaker Package subwoofe...fOLcs%3D[/url]
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    Last edited by ben7; 01-05-2018, 08:15 PM.

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  • ben7
    replied to Onkyo tx sr 607 -New DSP chip installed
    in Troubleshooting Audio Equipment
    Re: Onkyo tx sr 607 -New DSP chip installed

    SRT1, are there any other BGA chips on your board?

    To me, seeing that it works after a few hours of idle time makes me think that there is a thermal issue, like a bad solder connection which expands and makes connection after the PC board warms up.

    -Ben
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  • ben7
    started a topic Green LEOTEK LED traffic light insert! [Teardown/pics]
    in General Electronics Technical Discussion

    Green LEOTEK LED traffic light insert! [Teardown/pics]

    My father found a green LED traffic light insert thing in the intersection in front of his workplace. The lights at the intersection were all there, so it must have fallen off of a truck or work vehicle!

    Made by LEOTEK, which is a subsidiary of LiteOn.

    It's rated for 80 to 135VAC, 60Hz, 6.7W/7.1VA (So the PF is not quite 1).

    Model number: TSL-12G-LX-IL6-A1-P3
    (I attached the datasheet, which was easy to find regardless.)

    MFG date: AUG 2014

    Intensity rating: 475cd (min) @ 500nm (dominant wavelength)

    ...
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  • ben7
    replied to ANTMINER S9 power circuit
    in Troubleshooting Power Supplies and Power Supply Design
    Re: ANTMINER S9 power circuit

    Might very difficult if not impossible to fix due to the PIC chip. It might be read protected, or completely fried, etc..
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  • ben7
    replied to Overvoltage protection design ideas
    in General Electronics Technical Discussion
    Re: Overvoltage protection design ideas

    The simplest thing I can see doing is to connect a suitably sized [I]power transformer[/I] across the AC input before the UPS transformer, and connect the output of the [I]power transformer[/I] in series, anti-phased, with the UPS transformer primary winding. This will reduce the input voltage that the UPS transformer sees, thus reducing it's output voltage.
    (Note that connecting the output of the [I]power transformer[/I] in-phase with the AC will INCREASE the voltage the UPS transformer sees.)

    Of course, this might cause...
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  • ben7
    replied to Transformer in UPS runs warm for no apparent reason
    in General Electronics Technical Discussion
    Re: Transformer in UPS runs warm for no apparent reason

    That sounds normal to me. It's normal for a transformer to be warm even when unloaded, due to the "eddy current" losses in the iron core.

    This is why environmentalists don't like iron-core transformer (mains frequency transformers) based power bricks, because the standby power draw is higher compared to that of a switch-mode power supply.

    My guess is that the transformer is staying energized by the mains input in order to provide power to charge the battery.

    -Ben
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  • ben7
    replied to Good motor capacitors for an MOT?
    in General Capacitor Questions & Issues
    Re: Good motor capacitors for an MOT?



    Just get a 10kVA or similar size distribution transformer (or two!). Much easier, plus those can handle a larger amount of power. MOTs will overheat easily if you don't ballast them.

    Also keep in mind that one end of the MOT HV winding is often connected to the core of the transformer, so if you place them on something like wood, you will possibly end up with unexpected arcing.


    You sure that is correct? It seems more like that would be [I]apparent[/I] power rather than [I]true[/I]...
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  • ben7
    replied to Bad NCC SMQ 220/400 in 2006 Seasonic S12II
    in General Capacitor Questions & Issues
    Re: Bad NCC SMQ 220/400 in 2006 Seasonic S12II

    It's possible that the capacitor failure caused the diode to fail due to excessive ripple current or something like that.

    I haven't seen it myself yet, but I've heard of rare occasions where the PFC circuit in active PFC PSUs can go unregulated and send lots of voltage to the filter cap. You can usually tell when this happens by how the capacitor vents - the top is usually split open wider if the failure was more violent.
    (Compared to the classic bad caps which leak out the top over the course of a few months,...
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  • ben7
    replied to the gutless, bloated, and fried power supply hall of shame
    in Troubleshooting Power Supplies and Power Supply Design
    Re: the gutless, bloated, and fried power supply hall of shame

    Coworker brought to me a Chicago Electric 2kW inverter (model 92464) that he picked up for $30. He wanted my opinion as to how well built it is ...

    First off, note that it is a two-board design. The big board is the 12V to HV (probably around 170V or so) booster. The smaller board is the main controller, which also has 8 IGBTs on it for the DC to AC conversion. It's probably modified sine wave output because there is no output filtering inductor/capacitor (in fact not even EMI filtering!). The capacitors...
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    Last edited by ben7; 09-03-2017, 11:42 PM.

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  • ben7
    replied to ESR Mania
    in General Capacitor Questions & Issues
    Re: ESR Mania


    ^^^ I second this, even though I don't have a proper ESR meter yet. I've gone looking around and found good/decent ones for a decent price.

    Heck, if you repair lots of stuff, even spending $100 on a good ESR meter is well worth it!


    I'm not a capacitor engineer, but I suspect that there might be issues related to internal temperature, ESR and inductance with large value polys. With a fat capacitor, the heat can build up in the middle, where it is sort of thermally insulated from the rest of the can by the outer windings....
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  • ben7
    replied to DELL OEM H240AS-00 (HIPRO) ~ major blow up!
    in Troubleshooting Power Supplies and Power Supply Design
    Re: DELL OEM H240AS-00 (HIPRO) ~ major blow up!



    Well the more modern CapXon capacitors have been fine in devices like PSUs and such ... it was just those from the bad cap plague era that were a problem.

    Then again, yes, I still don't fully trust cheap capacitors! :P

    -Ben...
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