Re: Need help diagnose dead Sunshine ATX235 power supply
I disagree, because i did fixed many ( many ) ATX psu's of many types, i do not remember finding one with 23V or even close on the pin 12 of 494/7500, the most i found was almost 14V on one case, the majority had between 12 and 13V, all of them measured with the main converter off. As i have said the power for the IC comes from an auxiliary secondary of the auxiliary converter and it is regulated, indirectly yes, but still regulated by the turn ratio of the 5Vsb secondary to this one, the regulation depends on the leakage...
Marianelforum
Dj Marik
Last Activity: 10-25-2017, 07:50 AM
Joined: 07-29-2016
Location: Dambovita
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Re: Need help diagnose dead Sunshine ATX235 power supply
Based on what?...Leave a comment:
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Re: Need help diagnose dead Sunshine ATX235 power supply
I am not an expert, just a knowledge seeker as yourself, it's just that i've seeked it maybe a longer time than you...
Let's clarify a few thing first. The main converter is the one that powers up when you connect the green wire to a black one, and delivers the main outputs ( +12V, -12V, +5V and +3,3V ). The auxiliary converter is the one that powers up just as you connect the unit to the line voltage, meaning that is always on, and it delivers the 5Vsb output, it also powers up the main converter's controller...Leave a comment:
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Re: SATA /PATA external supply ?
I do not think insults helps anyone, maybe @Kaboom should be a bit more moderate, still Bianchi sometimes you are realy testing people's patience with your atitude. You really should be more modest and pay closer attention to what other say.
Good luckLeave a comment:
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Re: SATA /PATA external supply ?
You keep complaining about that and use it as an excuse not to learn basic electronics, but you still want to fix stuff, that in it's self is a contradiction
Electronics can only be a hobby, one wich you play with in your spare time, but even a hobby requires some research. Electronics can also be a job in it's self, if you really like it then you pay close attention to it, to the learning process, ( wich as it has been said, never stops ), sooner or later results will come, for example for me it started as a hobby from...Last edited by Marianelforum; 08-17-2016, 11:07 PM.Leave a comment:
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Re: SATA /PATA external supply ?
Well if you would have paid enough attention to the learning process in the university you would have understand what i am saying, in fact you would have most probably avoided at least some mistakes... Anyway, it is not my intention to belittle you, but just to point out important stuff.
This converter is as i said flyback, and basically they invest energy in the transformer core ( rather in the air gap ) when the power mosfet is switched ON, and delivers that energy in the form of power for the load when the mosfet is switched OFF,...Last edited by Marianelforum; 08-17-2016, 12:09 PM.Leave a comment:
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Re: SATA /PATA external supply ?
I am sorry if i seemed to come hard on you, but you are experimenting with what is in fact a complex converter, first of all it is a flyback converter, that in it's self says plenty, the flyback converter involves complex calculation in the design part, everything depends on everything for good working order, i could fill more than a couple a pages with just the transformer calculations. Self-oscillating flyback converter like the one you are working to fix is even more complex, you do not have the luxury of an controller IC wich provides a stable...Leave a comment:
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Re: SATA /PATA external supply ?
You still do not understand, it is absolutely mandatory to have exactly 0,22 Ohm resistor there, ( i said this more than once but you have ignored me ) maybe 0,33 Ohm could work, but never, and i say again, never 22 Ohms. Try and read carefully, and keep in mind what other people say, do not ignore their advices.
I do not know of what diode you are using now but i sai again ( and for the last time ), you need an ultrafast rectifier diode with a voltage rating of at least 600V, t here are loads of choices, try to search datasheets for...Leave a comment:
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Re: Need help diagnose dead Sunshine ATX235 power supply
Your pictures are not clear enough to be of much help, but you said that after changinc some caps you found a good 5Vsb voltage, have you checked again the voltage at pin 12 of the 7500 IC after changing those caps?
You should follow back the trace for the controller power, put the black wire of the dmm on the output ground, and with the red one, probe at different points of the power trace back to the auxiliary transformer's secondary, you should find a rectifier diode from one of it's pins leading to a filter...Leave a comment:
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Re: Transistor replacement for L240AS-00
It is the "gate", and not the base, because it is a mosfet transistor, and not a bjt one, it is good to avoid making this confusion in the future....Leave a comment:
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Re: Delta Electronics: DPS-410DB A issues
Awsome job fixing it, did you recap it?Leave a comment:
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Re: SATA /PATA external supply ?
I understand and maybe even patially agree, but learning cannot come only from experiments, there has to be a good theoretical base, it allows you to look at things from another perspective, and also it prevents you from making basic ( and often costly ) mistakes.
The converter only seams simple from the component count point of view, but that's just an illusion, as a matter of fact this converter involves complex math and calculations in the design part, it is a fragile balance between component vallues and working parameters....Leave a comment:
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Re: Need help diagnose dead Sunshine ATX235 power supply
In the opening statement you have posted some ESR measurements and concluded that they are all normal, but to me they all seam wrong, for example the 470u/16V on the 12V rail, you sayd you got 0,2 Ohms, but as you probably know a smps filters it's outputs with low esr caps, and 0,2 Ohms is not a low esr standard vallue, you should always want less than 0,1 Ohms for that vallue ( 470u ), preferably under 0,05, especially on the larger capacity ones. Another example is the small caps, over 3 Ohms for 1uF cap does not seam a...Leave a comment:
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Re: LC 600h-12 v2.31
Half bridge converters usualy have 2 series 200-250V caps, this one has only one 400V, this is a clue that suggests a forward converter, i do realise there are half bridge converters with only one 400V cap, but they do use two 1-2,2uF/250V in series, and i do not see it in the pictures, so again i would have said forward converter from the start, what i do see is that it seams to have an active pfc as well. I too think it is well worth recapping, but as it has been sayd, clean the dust, and make sure the cooler is in perfect working order.Leave a comment:
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Re: SATA /PATA external supply ?
Most of the cheap ATX power supplies have that optocoupler, what you want to see is that "817" code, and there are loads of psu's with it.
R1 establishes a current loop for the self oscilating flyback converter, it needs to be the exact vallue in ohms, so .22 of an ohm ( 0,22 Ohm ), the power rating could be other vallue as long as it is not a lower one.
You cannot use a nomal diode for RCD snubber on a high frequency switch mode power supply, 1N4007 is way too...Leave a comment:
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Re: Delta Electronics: DPS-410DB A issues
Indeed there is a second board with EMI filters and active pfc:...Leave a comment:
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Re: Delta Electronics: DPS-410DB A issues
Greetings and thank you for the imput.
Indeed knowing that the PG imput on the motherboard is a digital one, i have concluded that it could either read the 3,3V PG signal as high or as low ( 1 or 0 ), meaning it could either start or not, so i've tested it and the computer seams to work ok, the voltages read in the setup menu ( bios ) are nearly perfect all of them, no suspect noise or other visible problem, so i suppose the psu is ok, that makes me happy, and maybe it will help others as well, i've failed in finding any info...Leave a comment:
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Re: Delta Electronics: DPS-410DB A issues
I will upload them here too if it is absolutely neccesary, anyway, for now nothing said here helps me... My question was a general one, the pictures are beside the point.Leave a comment:
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Re: Delta Electronics: DPS-410DB A issues
Indeed, i do not understand why they do not go full size when clicking on them... Here is the direct link:
[url]https://s6.postimg.org/pynu1gmld/014.jpg[/url]
[url]https://s6.postimg.org/koiva62ch/015.jpg[/url]
[url]https://s6.postimg.org/ihemm8x29/016.jpg[/url]Re: Delta Electronics: DPS-410DB A i.../015.jpg[/url]Leave a comment:
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Re: Delta Electronics: DPS-410DB A issues
Greetings.
As anticipated the fixing part was not a problem for this psu, all went as planned, here is a photo with the board just after the fixing was done:
[url=https://postimg.org/image/rqgswd5y5/][/url]
After some do cleaning:
[url=https://postimg.org/image/4qa5k184d/][/url]
[url=https://postimg.org/image/3lg3enlnh/][/url]
As you can see a good number of parts had to be changed, especially the caps, all the electrolytic capacitors has been changed with new ones ( and i do mean...Leave a comment:
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