Re: You think you've seen all the gutless power brick wonders?
Actually that board looks like it was removed from some scrapped name-brand power brick, rated 2 or maybe 2,5A. Too many good quality parts (e.g ceramic fuse) on there.
The chinese just get a big container of misc. recycled 2-3A power bricks, break open their case and bodge them into their new cases.
Still, that unit will be much safer even with missing PE connection than 90% of the no-name stuff sold on ebay will ever be.
Triple insulated secondary wire plus layer isolation vs. plain magnet...
robert
Senior Member
Last Activity: 01-18-2017, 11:22 AM
Joined: 01-26-2008
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Re: You think you've seen all the gutless power brick wonders?
Looks like they re-used the whole PCB from some smaller though fairly high quality brick...
Actually the best thing they could have done, the transformer looks properly isolated and it might pass EMC, if that ground wire were connected.
Usually, you get a china-designed PCB with near no creepage/clearance and a transformer with isolation so poor it will break down within the first year. putting 230v on the output.Leave a comment:
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Re: Focal Cub 3 won't start
Shorting the Diac: yes, should work, just do it quickly. And carefully, its at mains potential after all...
I would have a good look at the large (47k as it looks) resistor above the VDR. These like to drift upwards. Unsolder to check it.Leave a comment:
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Re: Focal Cub 3 won't start
Looks like the super-primitive self oscillating half bridge design often used in halogen lamp PSU.
No regulation, very little protection.
There is no electrolytic "start up capacitor" so stop looking for that. Check all of the high value resistors on the primary side, these can fail open. The Diac might be faulty too. Also some of the zener diodes on that vertical board might be bad if the FETs ever have failed.Leave a comment:
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Re: Complete recap / restoration of PSU?
Just wondering, whats wrong with the "old" PSU?
Looks unused and appears to be quite well made.Leave a comment:
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Re: Dead High Power HPC-560-A12S
Is there any voltage on +5Vsb?
The standby converter also supplies power to the PWM controller, so if it doesnt work, nothing will.
There will be no "start up" resistor around the CM6800 in a typical PC power supply. There are 2 dividers for sensing line and bulk voltage but these are not used for supplying its Vcc, as it is supplied by a winding on the standby supply.Last edited by robert; 12-23-2015, 09:14 AM.Leave a comment:
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Re: Upgrading Silverstone SX600-G PSU Caps
Look for capacitors with long load life, as this is what matters. So KY*/KZM/KZN series for example with 10k hours@105° for some of the best.
Polymer capacitors have lower rated load life, but use a higher temperature exponent due to a different degradation mechanism, so at realistic temperatures, a 3kh polymer will exceed a 10kh electrolytic. However, replacing electrolytic with polymer usually requires redesign of the control loop for stability under all conditions.
Quality wise similar specd parts of the major...Leave a comment:
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Re: Hantol worst AC Adapter ever!
I highly doubt the transformer fulfills any safety requirements. Approved TIW is very expensive and there is no space for necessary creepage distances with this core shape, so they will just have used normal magnet wire and no clearances whatsoever.
Combined with the fact it doesnt have any grounding (ie. Class II device) it IS dangerous. No way this will withstand the 3kV AC inslation testing needed for a class II device.
Also, no EMI filtering at all. Throw it away, right now.Leave a comment:
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Re: is this a good way to use polymer caps?
Rip the same track from one CD, with the same software, with several drives, and then run a binary compare over the resulting files.
And then dont tell us binary identical files sound different.Leave a comment:
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Re: New Capacitor brand
SSL? Looks like Samsung. Especially if its green.
And yes, its crap. Now sold under the name of Samwha, which is well known to anyone repairing TVs...Leave a comment:
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Re: Maxdata 101910 same as Viewsonic
Checked the 3.3V (switching) regulator on the logic board?
Its among all these green Teapo caps, output had a 6.3v/1000uF Rubycon on most of the units i repaired, but some had a Teapo there which was faulty.
Also, try manually pulling the ON/OFF line to the inverter high (to 3.3V), the light should be on then. If not, check the inverter.
If it still doesnt work, the logic board probably is toast, once you ruled out bad contacts or shorts as source of the problem.
Just recently thrown out a 19"...Leave a comment:
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Re: CAPXON replacement caps for PS
Yes, Nichicon HE is all right. Long life and known good quality.Leave a comment:
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Re: Could I replace 2.5v 820uf fake polymers with Sanyo WG 6.3v 1000uf?
Huch?
Capacitors used in crystal oscillators are in the range of 5 to 30pF. Thats small ceramic capacitors, these also come with closer tolerances.
Electrolytics never ae used as part of an oscillator circuit, only for power supply bypassing, where their value isnt so critical (after all, with +-20% tolerance, it cannot be).Leave a comment:
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Re: CAPXON replacement caps for PS
Good quality 85° as in, for example:
BHC ALC10
BC 050,053
Epcos B43511
Hitachi HP3
Nichicon LGU, LLC
Panasonic TS-UP, TS-UQ
and a lot more. Also, most large screw terminal capacitors are rated for 85°, too. And all these last very long...Leave a comment:
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Re: CAPXON replacement caps for PS
Pretty much any of the capacitors in your list are okay.
I would just pick the TS-ED, since the price is okay and these are well known high quality parts.
Since audio equipment doesnt operate at high average power levels, stress isnt that great (CapXon doesnt need any to fail, time is enough). If its running very hot, 105° rated capacitors would be a good idea, otherwise any good quality 85° unit will be sufficient.Leave a comment:
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Re: Konig CMP-PSUP450W
The output inductors (large toroid cores) are discolored from overheating. Iron powder cores are irreversibly damaged by too high temperatures, so these inductors need replacement.
However, its a typical piece of sh!t power supply, so the correct place for it is the trash bin.
Repairing a $15 PSU with $10 of parts and at least 2 hours for winding new inductors just isnt worth it, just get a better one instead.
Not much of a line filter, no soft start NTC, cheapest parts possible.Leave a comment:
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Re: Old PCB in new 12cm case
Did that with a old Enermax 460W unit (first or second active-PFC series, these with that rigid silver-screened ATX cable).
The fan was getting even louder then it already was, so i needed to replace it anyway.
At the same time, i had a "550W" LC-Power (iirc), that exploded upon plugging it in the first time (no wonder with the main filter caps installed backwards!), that had a fairly strong case with good ventillation and space for a 12cm fan.
Transplanting the enermax board (and its line filter module) into this case...Last edited by robert; 06-14-2010, 05:30 PM.Leave a comment:
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Re: dead arcade (peter chou) power supply
Cant be all that impossible to repair such a PSU.
Check every transistor and diode (best if you have/have access to a curve tracer, but standard test should do ususally), then replace the 494.
Also test all the larger resistors on the primary side, would not be the first time some increased their resistance or opened up without showing it, preventing the supply from starting.
As you said that it could run, i would rule out shorted diodes on the secondary side, also faulty switching transistors.
Oh, i just...Leave a comment:
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Re: Power supply build quality pictorial. part 2
Not a computer PSU, but this one shows how it can be done properly...
Majority of caps are OS-CON, topped with a few NCC KMF and Ruby YXF.
The Alucore-PCB heatsink/heatspreader is sort of an innovative idea, never saw this before.Should be quite good from a thermal point of view with the transistors soldered, also no screw to come loose....Leave a comment:
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Re: P4V533-MX only uses 1500uF caps!
First pic really shows the quality of Elite. Cant even get consistent length...
As for replacing all the OST 1000/6.3 with 1500/10V WG:
The OST all are used as filter capacitors for 3.3/5v, e.g no place where they could affect the stability of a voltage regulator with their much lower ESR.
I replaced the green KZE for good measure, also because one seemed to be damaged from removing the ATX connector.
...Leave a comment:
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