How to modify an at atx computer power supply to a 315v bench power supply halfbridge topology power supply mod. This design for an external adapter lets you use the power supply without modifying it. Troubleshooting and repairing atx power supply by jestine yong. Everyone sometimes needs an adjustable power supply. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage most modern desktop personal computer power supplies. If youre using this pinout table to test power supply voltages, be aware that the voltages must be within atx specified tolerances. Pc atx psu quick repair electronics repair and technology news. The universal psu kit is a power supply replacement designed by reactivemicro to be installed by the end user. Specifications the design closely follows the atx12v version 2. How to convert a computer atx power supply to a lab power supply. We carry high quality and hard to find power supplies for all manufacturers. The result is a high capacity power supply that can output 3.
The panasonic vcr power supply schematic is available in both pdf and gif format. The atx motherboard has a stacked io connector panel mounted on the motherboard. An annotated schematic of 250w atx power supply with active power factor correction \pfc\. The atx standard allows power supplies and cases to be commodity parts, dramatically reducing the cost of computer design. A power supply unit or psu converts mains ac to lowvoltage regulated dc power for the internal components of a computer. The best is still using the orginal board for testing.
Mode power supplies works the power mosfet technology and atx power supplies. I have a computer repair shop, and this power supply is one of the items i always have in stock. Service manuals, schematics, eproms for electrical technicians. All posts tagged atx power supply repair one zener diode found cracked and another shorted in cctv smps. The primary culprits are multicore cpus that can consume anywhere from 10w to 50w or more per core, for a total cpu consumption as high as 200w in a single processor system. Lessons learned from the success of this standard show why standardizing parts is important. How to convert a pc power supply to a desktop power source. Troubleshooting and repairing atx power supply brought to you by jestine yong i hope that you have enjoyed the short report of the easy way to understand switch mode power supply. By converting the cheap free atx power supplies that can be found in any. Applicable documents the following documents support this design guide as additional reference material. It is designed to replace the old power supply pcb with a new, modern solution while reusing the old power supply enclosure. On semiconductor is providing this reference design documentation package as is and the recipient assumes all risk associated with the use andor commercialization of this design package.
Some psus have modular cables, so you only need to fit the cables to you need, resulting in a neater build and better. Converting a pc power supply murray state university. Desktop power supply from a pc updated march, 2009 see the narrative and disclaimer at the bottom of the page do you have an interest in converting one of these. Find an exact match to the power supply you are looking for by using our power supply cross reference. This athena apmps4atx40 400 watt atx power supply takes up little space since it is only 4 inches deep. Scope this document outlines a reference atx power supply that complies with the atx specification, version 2. The btx standard builds on this, and the standards work should do likewise. The standard computer power supply unit psu turns the incoming 110v or 220vac alternating current into various dc direct current output voltages suitable for powering the computers internal components and with a little bit of imagination it is possible to convert atx psu to a bench power supply. Bench power supplies are expensive and therefore we usually use whats available. Automatic or manual recovery is allowed for other conditions. Slightly modifying the output voltage of a pc power supply. Below is the complete pinout table for the standard atx 24 pin 12v power supply connector as of version 2. Computer power supply troubleshooting atx pc power. Power supply design guide for desktop platform form.
In this document, i show you a repair article with high voltage. This power supply has atx design and 200w performance. Any atx power supply can be plugged into the adapter. On a socket 7 atx motherboard, the socket is placed a further distance from the expansion slots, allowing for long boards to be placed in easier. This is the full text index of all service manuals, schematics, datasheets and repair information documents. Everything else free delivery possible on eligible purchases. A completed 145 watt atx power supply with switch, binding posts, labels and feet. Atx atx12v 24 pin power supply connector pinout connector or cable wiring scheme bookmark this page 24 pin molex 442060007 connector at the motherboard atx12v 2. Troubleshooting and repairing atx power supply by jestine yong free download as pdf file.
I was drawed diagram, when i repaired this power supply. Cpu power supply not working, how to repair computer power supply. This instructable will show you how to make a professional looking bench power supply. This power supply was designed for atx and provides a power output of 200 watt. A dummy load can be made from a couple lamps that you can buy at any auto parts store and an. Highefficiency 255 w atx power supply reference design documentation package. Turn a computer power supply into bench power make. Updated typical power distribution tables for all power supply form factors and updated minimum loads.
The most well known power supplies of a high current low voltage are at or atx supplies from. Fullsize desktop systems use atx12v power supplies, as do most mini, mid, and fulltower systems. Highefficiency 255 w atx power supply reference design. It was the first major change in desktop computer enclosure, motherboard and power supply design in many years, improving standardization and interchangeability of parts. It is intended to provide additional power supply design information not detailed in. Protection plan documents will be delivered via email within 24 hours of purchase. Atx service manuals and schematics fulltext search. Another important cause of completely dead systems is using an atx power supply that does not provide enough current on. Customer atx power supply came in with the complaint of intermittent no power. How to modify an at atx computer power supply to a 315v.
To open downloaded files you need acrobat reader or similar pdf reader program. The ac supply power may be connected via housing port 3 or 6 or both for supply redundancy. Atx power supply service manuals and schematics fulltext. Modern personal computers universally use switchedmode power supplies. In my sophomore year of college at the university of minnesota, i started into my main electronics classes, and needed a good power supply for working on the lab projects at home in my room.
The fact that it has so many connectors makes this power supply extremely universal and compatible with lots of hp and dell systems. Here i bring you wiring diagram of pcs power supply of dtk company. Not only that, some filter capacitors also became bulge because of the heat accumulated inside the power supply. A step by step guide about 200 watt atx pc power supply function here you have the schematic diagram of atx pc power supply from dtk company. Files are decompressed supported zip and rar multipart archives text is extracted from adobe acrobat pdf or plain text documents so that you are able to perform searches inside the files. The latest revision in effect of the following documents forms a part of this document to the extent specified. Fortunately, its not difficult to fix pc power sup plies. This document defines a 250w atx12v power supply for an 1u system typical conditions to which an atx power supply may be subjected. Some will shut down after few seconds fan rotate for a while and stop you can either use dummy loads like used motherboard, hard disk and even atx power supplies tester to test out the power supply. Atx12v power supplies are the largest physically, available in the highest wattage ratings, and by far the most common. Notes on the troubleshooting and repair of small switchmode. You can read the actual repair extension program text in the. And today the 26 of october i was finally ready to check the inside of this switching power supply. Atx atx12v 24 pin power supply connector pinout and.
The integrated circuit tl494 utilised in this design is a very common power. With the introduction of this third generation, highefficiency atx power supply, on semiconductor has shown that with judicious choice of design tradeoffs, optimum performance is achieved at minimum cost. Apple imac g5 power supply repairs according to jim. An entry level atx power supply for a pci express gaming pc these days is 600w, and power supplies ranging from 750w to w are no longer unusual. Future references to the atx specification in this document imply version 2. Home atx power supply repair pc atx psu quick repair. Probably the most common failure that can occur in a computer is the power supply failure, and this is understandable. Ill show you all switch mode power supplies repairing secrets and how you. Atx power supply, modular power supply, microatx power. It is a very good power supply and fits most traditional desktops. Before i talk about option number three, i would like to point out that when you buy a used.
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