Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Power Supplies and Power Supply Design
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools
Old 09-08-2020, 01:58 PM   #1661
momaka
master hoarder
 
momaka's Avatar
 
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,385
Default Re: the gutless, bloated, and fried power supply hall of shame

Quote:
Originally Posted by Hemingray View Post
Best part: Damn thing can't even do 100mA without the voltage tanking. Output sagged down to 3V at just 125mA.
Dang, what a piece of garbage!

I also have never quite seen a design like this before.
It's flyback, of course. And it appears to have feedback, as evident from the optocoupler. But generally designs like that use 2 transistors: a bigger one for driving the transformer and a smaller one for driving the bigger transistor. This one has only ONE transistor doing everything on the primary side. I initially even confused it with one of those single-transistor oscillator designs with no feedback. Then again, it appears there is no difference between this one and the one-transistor oscillator designs when it comes to regulation... or lack thereof, I mean.

If the output caps are good and that thing is still only outputting only 3V with ~100 mA load, then it surely belong to the scrap pile. I mean, with such poor loading, you'll be lucky if you can power more than a few LEDs with this thing. Heck, if you remove the case LEDs, you can probably almost double the adapter's output capacity.

Last edited by momaka; 09-08-2020 at 02:00 PM..
momaka is offline   Reply With Quote
Old 09-10-2020, 12:46 PM   #1662
pc7fan
Badcaps Veteran
 
Join Date: Aug 2013
City & State: Maritimes
My Country: Canada
Line Voltage: 250V Split-phased, 60 Hz
I'm a: Hobbyist Tech
Posts: 49
Default Re: the gutless, bloated, and fried power supply hall of shame

Quote:
Originally Posted by PeteS in CA View Post
I think the second "+5V" column is for the -5V output. IMO, the chances the -12V and -5V outputs are capable of 1A are pretty low if they are regulated by a 78xx 3-T regulator.

The Semko and Nemko marks are pretty badly done, .

I'd guess the realistic output power at 250W-300W. Do NCC KMH series large-can lytics have black sleeves? Or the usual NCC brown?
Always brown. Same with KMM, KMQ and KMG.
pc7fan is offline   Reply With Quote
Old 01-16-2021, 02:16 PM   #1663
ben7
Capaholic
 
ben7's Avatar
 
Join Date: Jan 2011
City & State: Trenton, NJ
My Country: USA
Line Voltage: 240/120V 60Hz
I'm a: Hardcore Geek
Posts: 3,989
Default 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"
"Trained Service Personal Only."

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"
Secondary caps: 16V, 470/560/820µ ( ), "RLE2"
UL: E329462 (UL now requires you to register with them in order to see the listings! Bummer! So, MFG is unknown to me...)

Has screwed-together case (great for repairing!), synchronous rectification, polymer capaci- oh... a popped polymer!
The cap was installed the wrong way around in the factory! (Yes, this PSU was new, worked for a few minutes then popped, according to the guy I got it from. Poly cap pushed out the bung and short-circuited.)




^ You can see that the capacitor was installed backwards, based on the silkscreening (and PCB traces - not shown here).

P.S. Popped poly-cap odor is interesting! It smells like a combination of burnt fireworks and new car tires,... but with a notable sweetness.

-Ben
Attached Images
File Type: jpg P1016182_Cover.JPG (1.26 MB, 12 views)
File Type: jpg P1016187_bulged1.JPG (1.10 MB, 191 views)
File Type: jpg P1016189_bulged2.JPG (1.07 MB, 193 views)
File Type: jpg P1016206_MainsFET.JPG (404.7 KB, 14 views)
File Type: jpg P1016213_SyncRectFET.JPG (454.3 KB, 11 views)
File Type: jpg P1016215_Controller.JPG (489.8 KB, 13 views)
File Type: jpg P1016220.JPG (1.27 MB, 12 views)
File Type: jpg P1016224.JPG (956.8 KB, 12 views)
File Type: jpg P1166339.JPG (592.8 KB, 16 views)
File Type: jpg P1016185.JPG (1.14 MB, 15 views)
ben7 is offline   Reply With Quote
Old 01-16-2021, 03:23 PM   #1664
ben7
Capaholic
 
ben7's Avatar
 
Join Date: Jan 2011
City & State: Trenton, NJ
My Country: USA
Line Voltage: 240/120V 60Hz
I'm a: Hardcore Geek
Posts: 3,989
Default 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 PI coil; dunno about the ESR, but it measured OK capacitance-wise.)
UL: E161451

Was a pain to crack open, unlike the cheapo PSUs. I slightly damaged the case, but after recapping with NCC KYB (what I had on hand), it is good now for field testing/diagnosing purposes. After all, this PSU has a special 4-pin connector, and costs ~$60 new from a reputable source.





-Ben
Attached Images
File Type: jpg P1166292.JPG (1.20 MB, 5 views)
File Type: jpg P1166295.JPG (480.3 KB, 8 views)
File Type: jpg P1166297.JPG (1.79 MB, 9 views)
File Type: jpg P1166302.JPG (1.24 MB, 185 views)
File Type: jpg P1166304.JPG (856.7 KB, 186 views)
File Type: jpg P1166321.JPG (2.12 MB, 5 views)
File Type: jpg P1166322.JPG (1.53 MB, 5 views)
File Type: jpg P1166325.JPG (904.1 KB, 5 views)
ben7 is offline   Reply With Quote
Old 01-16-2021, 04:10 PM   #1665
ben7
Capaholic
 
ben7's Avatar
 
Join Date: Jan 2011
City & State: Trenton, NJ
My Country: USA
Line Voltage: 240/120V 60Hz
I'm a: Hardcore Geek
Posts: 3,989
Default 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 "VOLTAGEDE": 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 450V, "Nichicon HE" (FAKE - See pics!)
Controller cap: 47µ 50V "KSC"
Secondary caps: 2x 25V 1000µ "KSC"
UL: No safety certification markings at all!

Note that the LED in this unit is the unusual oval type...!


"CAUTION:
INDOOR USE ONLY.
FOR USE WITHIT EQUIPMENT ONLY."
Did they mean "without" equipment?




^ Burnt SMD resistors.

Here is the interesting bit:
A fake Nichicon HE!

^Horrible print quality, done in *silver* ink (unlike white on real Nichies) on black sleeve.


^Does this date code mean anything to you?!
1930, 2030? There aren't even 58 weeks in a year!
Maybe it is a secret code for "BULLSHITE!"


^ Wrong vent stamp, and poorly shrunken sleeve.


^ Wrong bung, and the leads appear to have been messed with.
Perhaps this was removed, re-sleeved, re-leaded (lead extensions welded on), then sold as "new/genuine"?
It measures about 63µF, for what it's worth!

Also, BTW... I opened this PSU with my bare hands.
Yes, my bare hands. No tools, no dropping nor throwing. Just a squeeze.
It was THAT easy to crack the plastic! (It mostly broke along the seam, but some of the actual shell broke along with it!)

-Ben
Attached Images
File Type: jpg P1166345.JPG (1.20 MB, 188 views)
File Type: jpg P1166347.JPG (1.26 MB, 3 views)
File Type: jpg P1166350.JPG (828.4 KB, 190 views)
File Type: jpg P1166354.JPG (994.9 KB, 7 views)
File Type: jpg P1166360.JPG (788.9 KB, 8 views)
File Type: jpg P1166361.JPG (1.07 MB, 6 views)
File Type: jpg P1166365.JPG (932.8 KB, 6 views)
File Type: jpg P1166371.JPG (1.26 MB, 7 views)
File Type: jpg P1166373.JPG (1.31 MB, 183 views)
File Type: jpg P1166376.JPG (614.9 KB, 7 views)
File Type: jpg P1166381.JPG (3.10 MB, 190 views)
File Type: jpg P1166386.JPG (634.2 KB, 186 views)
File Type: jpg P1166387.JPG (1.77 MB, 184 views)
File Type: jpg P1166396.JPG (1.98 MB, 183 views)

Last edited by ben7; 01-16-2021 at 04:17 PM..
ben7 is offline   Reply With Quote
Old 01-16-2021, 08:26 PM   #1666
ben7
Capaholic
 
ben7's Avatar
 
Join Date: Jan 2011
City & State: Trenton, NJ
My Country: USA
Line Voltage: 240/120V 60Hz
I'm a: Hardcore Geek
Posts: 3,989
Default Re: the gutless, bloated, and fried power supply hall of shame

Yet another faulty 12V 5A PSU ... this one has some absolutely filthy 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), 16V 680µ "LH.Nova" LE
UL: E329462


^ This is how the PSU was from the case. Very warped PCB.


^ It was difficult to take a picture of this, but you can faintly see the spot where the case has warped/melted/sunken. In fact, it is melted all along the heatsink for the primary side transistor, and especially so just above the transistor! Ouch!


^ Popped cap. Disappointing - no crazy Super-Nova here...


^ Mains bridge rectifier solder joints cracked, plus splattered solder balls everywhere!
...baa-a-a-aad! :sheep:


^ Mosfet has turned PCB a different color, and the joints are cracked. More splattered solder balls, too.

Now for the last one ... [properly] hold onto your soldering iron!

^ Mains input jumper link. Do you even solder?!
(It's in the place of an NTC thermistor. It's not a fuse; there is a fuse on the other mains leg.)

-Ben
Attached Images
File Type: jpg P1016231_Label.JPG (987.6 KB, 7 views)
File Type: jpg P1016233_Warp.JPG (571.4 KB, 183 views)
File Type: jpg P1016238_Popped_LH.Nova.JPG (1.13 MB, 178 views)
File Type: jpg P1016252_Melted.JPG (904.9 KB, 174 views)
File Type: jpg P1016265_VeryBadJoint.JPG (904.2 KB, 173 views)
File Type: jpg P1016271_BadJointDiodeBridge.JPG (857.5 KB, 184 views)
File Type: jpg P1016276_Controller.JPG (524.7 KB, 6 views)
File Type: jpg P1016285_OverheatedTraces_SolderPoor.JPG (1,008.6 KB, 175 views)
File Type: jpg P1166406_PrimaryFET.JPG (494.5 KB, 6 views)
File Type: jpg P1166409_SecondaryRect.JPG (457.6 KB, 6 views)
ben7 is offline   Reply With Quote
Old 01-17-2021, 09:44 PM   #1667
ben7
Capaholic
 
ben7's Avatar
 
Join Date: Jan 2011
City & State: Trenton, NJ
My Country: USA
Line Voltage: 240/120V 60Hz
I'm a: Hardcore Geek
Posts: 3,989
Default 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 ADAPTOR"
"PSU-1250-D4"

100-240V 50/60Hz 1.6A
12V 5A

"Trained Service Personal Only"

Rectifier: KBP310
Controller: GR8875N
Primary FET: SNF8N60
Secondary rectifier: MBRF20100CT
Primary cap: 120µ 400V, "Richcap" (Blown)
Controller cap: 22µ 50V "Richcap" (Bulged)
Secondary caps: 2x 1000µ 25V "Richcap" TM (Both bulged, one slightly)
UL: E473260

It smells charred ... just look at that PCB turning dark brown! It cooked the PCB around the mains bridge rectifier! (Excess RMS current due to bad cap(s)?)
On top of that, the output cable has two conductors, one red and one black; here you can see it has gotten so hot that the red wire has turned dark brown. (The barrel jack was not melted, FYI)








"WARNING:
CENTRO POWER
PS-D1205-D4-R1
2017/07/22"

BTW, keen eyes will note a damaged trimmer pot there... I did that during disassembly. But you can see, the electrolyte caused it to rust under where the plastic adjustment head was.
In addition, the one very bulged 1000µ cap has imprinted the shape of it's vent on the cover, pushing it out a little - ouch!

Also, sorry for the bad pics on this one, the lighting was especially bad here!

-Ben
Attached Images
File Type: jpg P1176420.JPG (2.61 MB, 175 views)
File Type: jpg P1176426.JPG (1.70 MB, 173 views)
File Type: jpg P1176428.JPG (1.26 MB, 169 views)
File Type: jpg P1176444.JPG (1.34 MB, 10 views)
File Type: jpg P1176450.JPG (1.68 MB, 9 views)
File Type: jpg P1176454.JPG (1.23 MB, 174 views)
File Type: jpg P1176464.JPG (1.39 MB, 169 views)
File Type: jpg P1176489.JPG (1.29 MB, 170 views)
File Type: jpg P1176496.JPG (1.06 MB, 5 views)
File Type: jpg P1176502.JPG (1.69 MB, 7 views)

Last edited by ben7; 01-17-2021 at 09:52 PM..
ben7 is offline   Reply With Quote
Old 01-19-2021, 01:54 AM   #1668
momaka
master hoarder
 
momaka's Avatar
 
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,385
Default Re: the gutless, bloated, and fried power supply hall of shame

BEN!!!!!!!!!!!
You're back!
Haven't seen you around here in ages. Always good to see your PSU posts.

Quote:
Originally Posted by ben7 View Post
This PSU is not that bad, however, it came with a fatal factory defect ...
...
Has screwed-together case (great for repairing!), synchronous rectification, polymer capaci- oh... a popped polymer!
The cap was installed the wrong way around in the factory! (Yes, this PSU was new, worked for a few minutes then popped, according to the guy I got it from. Poly cap pushed out the bung and short-circuited.)
That's a shame.
It really don't look to be too bad of a PSU otherwise.

Quote:
Originally Posted by ben7 View Post
P.S. Popped poly-cap odor is interesting! It smells like a combination of burnt fireworks and new car tires,... but with a notable sweetness.

Reminds me of when the judges comment on the food they are served in Iron Chef / Chopped TV shows.

Quote:
Originally Posted by ben7 View Post
Channel Well Technology
KPL-060F
...
Secondary caps: 2x 16V 1000µ SAMXON GK (blown)
Not surprised here.
Samxon aren't really that bad compared to other caps. But flyback converter PSUs really do stress output caps a lot more than regular continuous output designs. So for flyback, it's gotta be Japanese caps if you want the thing to last.

Quote:
Originally Posted by ben7 View Post
This one is not the worst out there, but it's pretty darn shameful I'd say!
...
A fake Nichicon HE!
https://www.badcaps.net/forum/attach...2&d=1610833288
^Horrible print quality, done in *silver* ink (unlike white on real Nichies) on black sleeve.
Concur.
If it uses counterfeit brand caps, it sure must be shameful. I'd rather see even Chang/Chong/Cheng/X than these... though the difference may not be that big really, and the result is guaranteed to be the same in the end - i.e. blown caps sooner rather than later.

Quote:
Originally Posted by ben7 View Post
^Does this date code mean anything to you?!
1930, 2030? There aren't even 58 weeks in a year!
Maybe it is a secret code for "BULLSHITE!"
Now that's funny!
Those Nichicon date codes are sooo easy to decipher and understand... yet the copycats failed to do even that. Then again, given the obviously bad fakery, it looks like they didn't try very hard to begin with.

Quote:
Originally Posted by ben7 View Post
UL: No safety certification markings at all!
Which is interesting, because at a glance, the PCB appears to be well-designed in terms of spacing and isolation distances. But that's where the good ends. The bad: secondary heatsink is extending over to primary side and is not covered/isolated and sitting to close to primary-connected components. Same appears to be going on with the primary heatsink over the secondary side. And to top it all of, the blue EMI/RFI cap between primary (-) bus and secondary ground appears a bit too thin, suggesting it may just be a regular 1 or 2 KV -rated ceramic instead of proper Y2-class. So most likely, this adapter would fail a proper hi-pot test.

Quote:
Originally Posted by ben7 View Post
^Does this date code mean anything to you?!
1930, 2030? There aren't even 58 weeks in a year!
Maybe it is a secret code for "BULLSHITE!"
Quote:
Originally Posted by ben7 View Post
"AC/DC ADAPTOR"
"TS5-6W"
Made for your MONITER

Quote:
Originally Posted by ben7 View Post
^ It was difficult to take a picture of this, but you can faintly see the spot where the case has warped/melted/sunken. In fact, it is melted all along the heatsink for the primary side transistor, and especially so just above the transistor! Ouch!

That's scary. The primary must have been drawing a crazy amount of power to do that. Surprised the primary controller didn't catch that. Then again, if OPP and other protections are not set properly, perhaps that's why.

Quote:
Originally Posted by ben7 View Post
^ Mains bridge rectifier solder joints cracked, plus splattered solder balls everywhere!
Maybe the guy who set up the wave solder machine read some "Western" guide with temperature instructions in Fahrenheit and then copied the same values on a machine that has settings in Celsius?

Quote:
Originally Posted by ben7 View Post
Now for the last one ... [properly] hold onto your soldering iron!
https://www.badcaps.net/forum/attach...5&d=1610848475
^ Mains input jumper link. Do you even solder?!
Oh, it's fine! Mains electricity can jump over small gaps like that, so why does it even matter?

Quote:
Originally Posted by ben7 View Post
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.
...
UL: E473260
I guess that goes to show that UL-listed doesn't necessarily mean designed well. In this case, the primary PWM controller really should have sensed something is going on.

Quote:
Originally Posted by ben7 View Post
In addition, the one very bulged 1000µ cap has imprinted the shape of it's vent on the cover, pushing it out a little - ouch!
Nice!

Thanks for posting these. Was a really fun read for sure.
momaka is offline   Reply With Quote
Old 01-19-2021, 06:42 PM   #1669
goodpsusearch
Badcaps Veteran
 
Join Date: Oct 2009
City & State: Thessaloniki, Greece
My Country: Greece
Line Voltage: 230VAC 50Hz
I'm a: Knowledge Seeker
Posts: 2,020
Default Re: the gutless, bloated, and fried power supply hall of shame

welcome back ben!
goodpsusearch is offline   Reply With Quote
Old 02-05-2021, 09:18 PM   #1670
ben7
Capaholic
 
ben7's Avatar
 
Join Date: Jan 2011
City & State: Trenton, NJ
My Country: USA
Line Voltage: 240/120V 60Hz
I'm a: Hardcore Geek
Posts: 3,989
Default Re: the gutless, bloated, and fried power supply hall of shame

Thank you for the warm salutations, momaka and goodpsusearch.

Quote:
Originally Posted by momaka View Post
Which is interesting, because at a glance, the PCB appears to be well-designed in terms of spacing and isolation distances. But that's where the good ends. The bad: secondary heatsink is extending over to primary side and is not covered/isolated and sitting to close to primary-connected components. Same appears to be going on with the primary heatsink over the secondary side. And to top it all of, the blue EMI/RFI cap between primary (-) bus and secondary ground appears a bit too thin, suggesting it may just be a regular 1 or 2 KV -rated ceramic instead of proper Y2-class. So most likely, this adapter would fail a proper hi-pot test.
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 INDEED are using recycled/re-sleeved capacitors!
The sleeves are the same and they all have the welded-on lead extensions, but the bungs are different. On one unit, the bung is like that of an NCC (Nippon Chemi-Con) cap. Interestingly, it hasn't bulged, but it seems to have gone high-impedance or has been abused (?overheated externally?), as its sleeve cracked. This PSU also had a slight melt/droop on the external case, and the PCB was browned, but not as badly as the PSU-1250-D4 (Not "SUPERNIGHT" branded) in one of my previous posts.
They all measure 60-70µF. One cap has slight corrosion around the negative lead.

All the other caps are the same across all 3 units. I measured them also:
The PWM chip electrolytic is 47µF, but they all measure about 20µF or so. The output caps measure about 1800-3000µF, which suggests to me that they are failing (despite not bulging) due to high leakage current. (They're rated 1000µF 25V, KSJ brand.)


^ Three different bungs. One black-bunged cap has an "X' vent and the others have the "Y" vent.


^Unit overheated, melted case (not shown), switching FET shorted and the re-sleeved capacitor has evidently seen better days.

-Ben
Attached Images
File Type: jpg P1316552.JPG (974.1 KB, 132 views)
File Type: jpg P1316558.JPG (821.5 KB, 4 views)
File Type: jpg P1316561.JPG (661.9 KB, 5 views)
File Type: jpg P1316567.JPG (867.3 KB, 4 views)
File Type: jpg P1316575.JPG (1.08 MB, 4 views)
File Type: jpg P1316526 - Copy.JPG (894.5 KB, 142 views)

Last edited by ben7; 02-05-2021 at 09:31 PM..
ben7 is offline   Reply With Quote
Old 02-06-2021, 05:23 PM   #1671
Xan03
Member
 
Join Date: Jan 2021
City & State: Germany
My Country: Europe
I'm a: Knowledge Seeker
Posts: 31
Default Re: the gutless, bloated, and fried power supply hall of shame

Did a little writeup on a dead bequiet PSU over in the other thread, but I figured I might as well post this other one from the junk box as well before disposing of it... this is a bequiet Pure Power L7 430W bought in 2011. This one never saw much use other than for occasional testing.






Perhaps not as terrible as much of the other stuff in this thread, though the c(r)ap selection mainly consisting of CrapXon and Teapo isn't exactly great... reason this one is fried is that one time I was trying to patch up some traces on an old broken Slot 1 board and used this PSU for testing; after doing so it turned itself on just upon plugging in the ATX connector and promptly released some hefty magic smoke . I was actually hoping to find which part had exactly burned up but no luck.

I'll note this unit received overall very positive reviews locally back in the day, praising its build quality amongst other things. That little screwed on PCB does look pretty rough though... in the end this was only a ~40€ unit though so can't expect too much I guess.
Attached Images
File Type: jpg l7_7.jpg (2.74 MB, 6 views)
File Type: jpg l7_1.jpg (3.15 MB, 133 views)
File Type: jpg l7_2.jpg (2.96 MB, 131 views)
File Type: jpg l7_3.jpg (2.72 MB, 5 views)
File Type: jpg l7_4.jpg (2.69 MB, 131 views)
File Type: jpg l7_5.jpg (510.8 KB, 133 views)
File Type: jpg l7_6.jpg (3.00 MB, 5 views)

Last edited by Xan03; 02-06-2021 at 05:33 PM..
Xan03 is offline   Reply With Quote
Old 02-06-2021, 10:34 PM   #1672
momaka
master hoarder
 
momaka's Avatar
 
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,385
Default Re: the gutless, bloated, and fried power supply hall of shame

Quote:
Originally Posted by ben7 View Post
It turns out, they INDEED are using recycled/re-sleeved capacitors!
Sad to see what we've come to in this world

I am all about re-using and up-cycling when possible... but some things just need to be buried and left to RIP. Those crappy recycled caps should go under this category.

That said, the bung on one of them with the extruded "T" stamp looks like it indeed might have been some legit known-name brand before, as you noted.

I guess you should give it to your local electronics recycler for them to send it back to China... or wherever else they still send these things nowadays... and after some time, maybe it will be back in another crappy no-name adapter

Quote:
Originally Posted by ben7 View Post
The output caps measure about 1800-3000µF, which suggests to me that they are failing (despite not bulging) due to high leakage current. (They're rated 1000µF 25V, KSJ brand.)
Yeah, that's most definitely high leakage current / electrolyte "eating" the aluminum foil. Give them the full rated voltage printed on their sleeve and watch them pop. I bet very few (if any) will survive. (And that's if their sleeves weren't telling a lie about the rated voltage, which could be the case too.)

Quote:
Originally Posted by ben7 View Post
^Unit overheated, melted case (not shown), switching FET shorted and the re-sleeved capacitor has evidently seen better days.
In other words, nothing is salvageable from this adapter.

Quote:
Originally Posted by Xan03 View Post
Did a little writeup on a dead bequiet PSU over in the other thread, but I figured I might as well post this other one from the junk box as well before disposing of it... this is a bequiet Pure Power L7 430W bought in 2011. This one never saw much use other than for occasional testing.
Save the X2 and Y2 caps, along with the line chokes - these can come in handy when fixing other PSUs. If you have a desoldering iron with vacuum (or just manual vacuum pump), try saving the rectifiers too - they make nice upgrades for monitor power supplies that have undersized rectifiers.

Last edited by momaka; 02-06-2021 at 10:36 PM..
momaka is offline   Reply With Quote
Old 02-10-2021, 08:25 PM   #1673
momaka
master hoarder
 
momaka's Avatar
 
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,385
Thumbs down YT-1208 power adapter

Here’s a really lame one:

It’s a “YT” –branded (read: no-name) power adapter that was included with the programming boards we had to buy for one of our university classes (some years ago back when I was in uni.)

Let’s look at the label:

Well, there’s not much to it. A bunch of symbols on the bottom indicate that this is a double-insulated device ( ), for indoor use only, and not to be opened (risk of electric shock.) OK… what about safety approvals? - Bah, ain’t nobody care about those!
This aside, the adapter is rated for 110-240 VAC input and 12V, 1 Amp.on the output. The red ink marker was actually someone crossing out the “12V” print and writing “15V” below it… which is correct – the adapter does output 15V. I suspect these adapters were bought in bulk for the class and modified by the teacher who teaches (and manages) that class, since he also designed the programming boards too (which were full of cheap Chinese parts and what seemed to me fake Rubycon caps, BTW…) This teacher was also the only one I’ve ever had problems with in my academic life (calling my project “bull----“, literally)… but that’s another story. (It ended OK once I had the dean involved, that’s all I’ll say here.)

Anyways, let’s look inside this no-name adapter…




Well, at least it was easy to open with just a single screw! Case is quite crappy and made of rather cheap, thin plastic. Input filtering is… where? We just get a small glass fuse and thin (24? AWG) input wires acting as a secondary fuse.
“Bridge rectifier” is just four 1N4007 diodes. Input cap is a 400V, 10 uF unit made by Chong (CD11x series… or whatever that means.) Startup cap is a 35V, 47 uF and also Chong CD11x. But hey, on the positive side, at least there is a PWM-FET IC in there: an ST VIPer22A. As for whether or not it’s a genuine ST part or not… I heard you like Russian roulette?

That aside, isolation is probably the biggest concern with this adapter. First, note how small the transformer is. Of course the PCB silkscreen has marks for a bigger one, but a smaller one was used. And to make matters worse, there is a 1 nF 1 kV -rated ceramic cap between primary ground and secondary ground. Such cap is used for reducing EMI and RFI. Because of the way it’s connected, it has to be rated Y1 or Y2 class… which this one is NOT.

Let’s move to the output/secondary side…
Output rectifier is an SB3100 (3 Amp 100V Schottky), with the output DC filtered by a 16V 1000 uF 10x18 mm cap and a 16V 470 uF 10x13 mm cap - both being Chong “LOWESR” CD110x series. A PI coil is also present between them. Finally, the output wires: 20 AWG, 600V. – Yes, “they” used 600V –rated wires on the output but only 300V on the AC input. Perhaps this is to protect the AC line from getting shocked by humans?

Last but not least… remember that red marker I talked about on the label that indicated the adapter as being 15V? Well, have a look here:

^ I don’t know if this “work” was done by said teacher above (or he might have had students do this for him “for experience purposes”, as from what I learned he also had certain parts of the programming boards done this way.) But either way, that’s a craptastic job for sure. I wonder how many adapters arced over and burned out from this hack job.

So the above mods were done to convert these adapters to 15V for the programming board we used. On that note, I haven’t tested what output current it can sustain. But if I remember correctly, I had no problems pulling up to 500 mA a few times out of it. I also remember a few slightly more careless students who happened to short the output on these power adapters on their breadboard. Miraculously, none of the adapters blew and only shut-down gracefully. So looks like that VIPer22A PWM-FET IC is doing its job properly. Too bad it can’t do anything about the lame small transformer and poor isolation with the 1 KV ceramic cap. And while I’m complaining here, I must say that red LED indicator lamp is brighter than a 1000 suns! This may not be a bad thing, though – at least you get a bright RED (warning?) light you that the adapter is plugged in, as if saying DANGER! DANGER! Don’t leave me plugged in!

On that note, I haven’t been using this power adapter for anything other than a few brief tests and nothing where I was grounded. I simply don’t trust it. With those caps, the non-existent input filter, and that lame pri-sec isolation, this thing probably won’t be used in anything critical. However, I might re-build it one day just for fun - that is, get new caps, replace the 1 KV ceramic cap, install input filtering + new wires, and see if the transformer primary and secondary windings are isolated properly from each other, along with remove those resistor hack-jobs. Oh, I mustn’t forget taming the output of that red LED. No idea when (if ever) I’ll try that, though. But just throwing the idea out there, as the design with the VIPer22a IC is otherwise decent. At least this one is not a silly single or 2-transistor self-oscillator without any protections.
Attached Images
File Type: jpg YT power adapter [YT-1208] (1).jpg (92.4 KB, 116 views)
File Type: jpg YT power adapter [YT-1208] (2).jpg (78.2 KB, 118 views)
File Type: jpg YT power adapter [YT-1208] (3).jpg (251.8 KB, 115 views)
File Type: jpg YT power adapter [YT-1208] (4).jpg (191.4 KB, 120 views)
File Type: jpg YT power adapter [YT-1208] (6).jpg (92.5 KB, 122 views)
File Type: jpg YT power adapter [YT-1208] (7).jpg (92.6 KB, 120 views)
File Type: jpg YT power adapter [YT-1208] (5).jpg (189.7 KB, 116 views)
momaka is offline   Reply With Quote
Old 02-13-2021, 01:42 AM   #1674
Behemot
Badcaps Veteran
 
Behemot's Avatar
 
Join Date: Dec 2009
City & State: Prague, 50°4'52.22"N, 14°23'30.45"E
My Country: CZ
Line Voltage: 230 V/50 Hz
I'm a: Knowledge Seeker
Posts: 4,582
Default Re: the gutless, bloated, and fried power supply hall of shame

Quote:
Originally Posted by Xan03 View Post
Perhaps not as terrible as much of the other stuff in this thread, though the c(r)ap selection mainly consisting of CrapXon and Teapo isn't exactly great... reason this one is fried is that one time I was trying to patch up some traces on an old broken Slot 1 board and used this PSU for testing; after doing so it turned itself on just upon plugging in the ATX connector and promptly released some hefty magic smoke . I was actually hoping to find which part had exactly burned up but no luck.

I'll note this unit received overall very positive reviews locally back in the day, praising its build quality amongst other things. That little screwed on PCB does look pretty rough though... in the end this was only a ~40€ unit though so can't expect too much I guess.
Yeah it's an old FSP platform so on the better side, just their capacitors choise is dubious since…ever
__________________
Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

Exclusive caps, meters and more!
Hardware Insights - power supply reviews and more!
Behemot is offline   Reply With Quote
Old 02-14-2021, 07:37 AM   #1675
ben7
Capaholic
 
ben7's Avatar
 
Join Date: Jan 2011
City & State: Trenton, NJ
My Country: USA
Line Voltage: 240/120V 60Hz
I'm a: Hardcore Geek
Posts: 3,989
Default 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 about 130µ and its sibling measures ............ ~4300µ.

But what's "special" here, is the primary 68µ 450V cap.
It's another fake Nichicon, with a "Y" shaped vent, concentric-circle bung, "HE" series, silver print (instead of white), welded-on leg extensions, and wildly incorrect date code.
However ......... This one has hemorrhoids!

(Dunno why it pooped itself, looks like the bung melted and bubbled only in a localized area. The top of the cap is not bulged, and the legs are still firmly in place; I've seen this before on high voltage electrolytic caps, but the legs always corrode through and fall off.)


https://www.youtube.com/watch?v=CKjaFG4YN6g

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

Quote:
Originally Posted by momaka View Post
... I suspect these adapters were bought in bulk for the class and modified by the teacher who teaches (and manages) that class, since he also designed the programming boards too (which were full of cheap Chinese parts and what seemed to me fake Rubycon caps, BTW…) This teacher was also the only one I’ve ever had problems with in my academic life (calling my project “bull----“, literally)… but that’s another story. (It ended OK once I had the dean involved, that’s all I’ll say here.)
Haha, fake teacher, fake caps!
Lemme guess, the project had too much toxic masculinity?
It's no wonder why our schools are crap these days - we pay the highest prices for the least amount of "teaching."
At least half the teachers (in my experience) try to be more like slave-masters than anything else. If you don't do exactly as told, you'll get a bad grade. "Critical thinking" be damned!

-Ben
Attached Images
File Type: jpg P2146665.JPG (730.1 KB, 10 views)
File Type: jpg P2146688.JPG (889.0 KB, 7 views)
File Type: jpg P2146693.JPG (950.0 KB, 97 views)
File Type: jpg P2146702.JPG (1.11 MB, 95 views)
File Type: jpg P2146724.JPG (938.2 KB, 95 views)
ben7 is offline   Reply With Quote
Old 02-17-2021, 03:29 PM   #1676
PeteS in CA
Badcaps Veteran
 
PeteS in CA's Avatar
 
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz
I'm a: Professional Tech
Posts: 3,127
Default Re: the gutless, bloated, and fried power supply hall of shame

Quote:
But what's "special" here, is the primary 68µ 450V cap.
It's another fake Nichicon, with a "Y" shaped vent, concentric-circle bung, "HE" series, silver print (instead of white), welded-on leg extensions, and wildly incorrect date code.
I don't need to look at HE series datasheets to know the available voltage ratings don't go as high as 450V. The HE series is very good, but that is a very poor counterfeit, and a recycled used part to boot.
__________________
PeteS in CA

Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.

Where might is right
There is no right.
- Sophocles in "Antigone"
****************************
All that is gold does not glitter,
Not all those who wander are lost;
- J.R.R. Tolkien, The Fellowship of the Ring
****************************
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
PeteS in CA is offline   Reply With Quote
Old 02-22-2021, 05:44 PM   #1677
zunasthegreat
Member
 
Join Date: Dec 2017
City & State: Euro-Fail
My Country: EU
Line Voltage: Li-On
I'm a: Hobbyist Tech
Posts: 53
Default Re: Another Supernight

Hmm that "cap maze" looks familiar, its probably some low quality OEM. Most common now as ChongX or ChengX.
Attached Images
File Type: jpg IMG_20210223_013811.jpg (554.3 KB, 15 views)
zunasthegreat is offline   Reply With Quote
Old 02-24-2021, 01:05 AM   #1678
momaka
master hoarder
 
momaka's Avatar
 
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,385
Default Re: the gutless, bloated, and fried power supply hall of shame

Quote:
Originally Posted by PeteS in CA View Post
I don't need to look at HE series datasheets to know the available voltage ratings don't go as high as 450V.
^ Exactly!

Quote:
Originally Posted by ben7 View Post
Haha, fake teacher, fake caps!
Well, I wouldn't go as far as calling him a fake teacher. He actually knew his stuff, at least when it came to programming microchips (what that class was.) Problem was his ego - if you didn't learn or do everything exactly the way he wanted you to learn it or do it, he'd disregard you and even become mean to you... which is what happened in my case, as I found a way to do one of the projects without using his software button de-bouncing routine (since it wasn't stated anywhere on the project requirements sheet that this had to be exactly there). Instead, I implemented my own way, which worked perfectly... if not better, since my code ran in predictable timed loops rather than going haywire with interrupts and crazy line calls/goto's like his.

Anyways, long story short, he didn't want to admit that my code actually worked and even refused to look at my project based on that assumption. This would have meant to re-take the class... and I was about to graduate, so "I ain't 'aving it" (as PhotonicInduction would say in some of his videos, minus the hammer part lol... though I almost got mad enough that time to kick his a**), so things got pretty ugly between us (verbally) until I got the dean involved. But anyways, glad that's over, and I guess this POS power adapter is the only thing that will remind of what I had to do to get done with that silly class... or silly teacher, rather.

Quote:
Originally Posted by ben7 View Post
At least half the teachers (in my experience) try to be more like slave-masters than anything else. If you don't do exactly as told, you'll get a bad grade. "Critical thinking" be damned!
Interesting.
For me, it was really just that one teacher for the most part. I mean, I've also had a few others with a somewhat elevated ego's too, but not in that uni/school (mostly just in high school) and not anywhere close to that level. This guy was ridiculous. He'd even say it outright regularly in class when anyone asked questions about doing something in a different way,
"Don't argue with me, this is how it is because I tell you so."

Last edited by momaka; 02-24-2021 at 01:08 AM..
momaka is offline   Reply With Quote
Old 02-24-2021, 03:23 AM   #1679
Agent24
I see dead caps
 
Agent24's Avatar
 
Join Date: Oct 2007
City & State: Hiding inside a plated-through hole
My Country: New Zealand
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 4,683
Default Re: the gutless, bloated, and fried power supply hall of shame

Quote:
Originally Posted by momaka View Post
This guy was ridiculous. He'd even say it outright regularly in class when anyone asked questions about doing something in a different way,
"Don't argue with me, this is how it is because I tell you so."
Did he offer the class Kool-Aid as well?...
__________________
"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHorn
Agent24 is offline   Reply With Quote
Old 04-19-2021, 01:07 PM   #1680
Topcat
The Boss Stooge
 
Topcat's Avatar
 
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 14,008
Default Re: the gutless, bloated, and fried power supply hall of shame

Here's a super junky PSU, reported here at Per's request!

The junker in question is a "Manhattan PUF405S" ATX power supply.





While this supply was working when I pulled it from a system that was given to me, it's definitely a cheapo. The first thing I noticed were the very thin/flimsy wires. I peered inside and noticed about 1/3 of the space inside the case was empty....and this thing weighed less than a happy meal....



Opened up.....and even more embarrassing!! Rated at 405w, look at those puny sinks....





Then WTF is this goofy air deflector on the fan?!? Never seen anything like that on all my years....







More of the puny sinks. Secondary caps are Samxon GF series, known to be a bit problematic....but these appear to be good...



Now to scope the outputs.... They were a little noisy, but not the worst I've seen. When warmed up, the noise did settle down a little.....





The top is CH-A; the 12v rail...the bottom on CH-B; the 5v rail.



Recapping it would likely smooth that out....but this one is just not worth it....I just wanted to autopsy it.
Attached Images
File Type: jpg psu_5446.JPG (263.5 KB, 27 views)
File Type: jpg psu_5447.JPG (341.4 KB, 27 views)
File Type: jpg psu_5448.JPG (260.3 KB, 27 views)
File Type: jpg psu_5449.JPG (285.3 KB, 30 views)
File Type: jpg psu_5450.JPG (223.0 KB, 32 views)
File Type: jpg psu_5451.JPG (297.6 KB, 31 views)
File Type: jpg psu_5452.JPG (266.6 KB, 35 views)
File Type: jpg psu_5453.JPG (295.4 KB, 31 views)
File Type: jpg psu_5454.JPG (279.6 KB, 28 views)
File Type: jpg psu_5455.JPG (407.6 KB, 27 views)
File Type: jpg psu_5456.JPG (425.1 KB, 27 views)
File Type: jpg psu_5457.JPG (241.7 KB, 28 views)
__________________
<--- Badcaps.net Founder & Owner

Badcaps.net Services:

Premade Capacitor Kits
Badcaps.net Capacitor Master List


Motherboard Repair Services


If you've come here in search of replacement capacitors or repair services, please use the links above.
----------------------------------------------
Badcaps.net Forum Members Folding Team
http://folding.stanford.edu/
Team : 49813
Join in!!
Team Stats
Topcat is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums © 2003 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 11:49 PM.
Did you find this forum helpful?