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a manual for cleaning women selected storiesThe PSU needs a connection to the motherboard to be told to turn on. When you press the power button on your case, it jumps the green wire to a ground, telling the PSU to turn on. When this “jump” is broken, the PSU shuts off. Please keep in mind, that capacitors inside your PSU store enough current to kill (or at least make you feel uncomfortable). While we will not be working inside your PSU, keep safety in mind. Half an inch should be more than ample. The PSU can now be turned on or off using the power switch on the back of the PSU. While a paper clip will work, I highly discourage doing that. Please keep in mind, that capacitors inside your PSU store enough current to kill (or at least make you feel uncomfortable). While we will not be working inside your PSU, keep safety in mind. Depending on how you will be situating this PSU and switch, your wire may only be a few inches or a few feet long. - For this project, I've actually used two different colored pieces of wire. Again, about half an inch should be enough. Needle nose pliers can be used to make a nice, tight loop around the terminals. Make sure you are using a non-lead based solder to avoid lead poisoning.;) Simply plug one wire from the switch into the PSU's green connector and the other wire into any of the black connectors. It doesn't matter which one of the black connectors you use, and it doesn't matter which end of switch is connected to which wire. All that matters is that one wire is connected to green, and one is connected to black. Being able to do this has been extremely helpful to me as a reviewer, however it also comes in handy if you run a high power Thermoelectric Cooler (aka TEC or pelt) that requires the use of a 2nd PSU. Here's a few ideas. You can use a bent paper clip to act as the jumper. Jumper the green and black wires which are pins 13 and 14 on a 20-pin ATX power supply. More details about ATX power supply wiring can be found at this link.http://www.braincity.us/webcms/eaton-5115-user-manual.xml
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We'll assume you're ok with this, but you can opt-out if you wish.Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information. It is mandatory to procure user consent prior to running these cookies on your website. The ATX motherboard’s standby power mode green LED illuminates when the power supply is switched on, but why won’t the computer turn on, with all the hard drives, CD ROMs, and spinning fans, when the ON button is pressed. Keep reading to find out why and how the problem is resolved. Desktop computers have smart power supply systems. They don’t operate like a simple light switch on the house wall, for example. Computers can shut themselves off, enter a hibernation mode (for power saving or unnecessary frustration, depending on when this happens), and rely on circuitry in the motherboard for power supply control. Simply swapping one power supply for another did not fix the problem. First, thank you Wikipedia and its contributors for placing every bit of useful information on the world wide web (WWW) that was once only contained in user manuals and instruction manuals. This pin diagram for an ATX power supply is courtesy of Wikipedia and can be found at. Wikipedia has useful information but it isn’t always directly applicable to the immediate situation. This is an especially fortunate set of circumstances. The original ATX power supply appears to work.http://yjunguk.com/userfiles/eaton-3105-manual.xml Simply swapping out one power supply for another didn’t fix the problem of the computer not powering up when the ON button is pressed. Following the binary search approach, if it’s not the power supply then the problem must be with the switch or with the motherboard itself. On the surface, one problem sounds like a cheap quick fix while the other sounds expensive and time consuming. Pictured below is the ASUS ATX motherboard, purchased right after they embedded the WiFi cards in the motherboard. Yeah, it’s seen a couple of years. If all else fails it will be necessary to tap into some of these connectorized contacts to monitor voltages during the power up sequence. It’s a messy practice and one best avoided, but when other measures fail, it’s a proven way to monitor analog voltages and digital outputs. By FixedHDD Follow More by the author: In this instructable i will show you how to power up an ATX Power Supply without a PC.Just look after the green wire in the cable tree from the PSU.Now it's time for the wire. Bend the wire and close up the little green plug from the big ATX plug to any other BLACK plug. Cause the black is the ground. To come off best you should connect the green with black besides the green. Your PSU should power up immendiatly. You are done! 2 Notes: Use a thicker cabel for this.When you do this make sure that you have some device(s) connected to the PSU. Otherwise your PSU tries to drive the non-existing device an will overheat. Add Tip Ask Question Comment Download Step 3: Extra Options Add a switch instead the wire.Ready to go! BTW: I'm German. Maybe my English isn't so good. Add Tip Ask Question Comment Download Share it with us! I Made It! Recommendations How to Build 8x8x8 LED Cube This worked perfectly, but when I tried to connect a bigger motor (a windshield wiper motor) to my ATX, it didn't work. The ATX generates about 22 amps so it should be working. Does anyone know how this is possible. Thank you! This tutorial is perfect and gets to the point. 0 Diez66 Thank you to the original poster and more so, now, the comenters. Thanks all! 0 Gregori Smith Question Found bad connection from Frt Pnl Switch to Mobo so fixed it but no good; still dead. I thought (maybe) one of the attached devices (SSD, HDD, FDD, etc.) might be shorted causing the supply not to want to start up. Right now it's out of its case and on the shelf waiting for field medics to check it out. Otherwise, can you advise where to get a replacement for it??? Any other ideas? 0 bobdobolina Superb advice regarding the brown wire. I've been struggling with this problem for some time now, so the power supply went off suddenly since I wasn't using the brown wire. Now it works perfectly by following your advice! 2 EdwinM73 Additionally for stable and correct voltage you should also have your psu under 10 of its rated load from startup, i.e. if you have a 750watt psu you should have 75 watts of load minimum, you can just use a Panel Mount Fixed Resistor say 50 to 100 watts, again the psu will turn on with out load but may not give the exact voltages you desire. Hope i helped you all: ) So I have tried this, and still the PSU will turn off as soon as I put load on the 12v 4pin connectors. There is two wires going to the pin. What does this mean. Does this work differently? 0 10241 jleebiz If that doesn't work, maybe you have a dead PSU 0 ginan-tsi Tip So I ended up put a 12v 50w light bulb that used in cars attached to the 5v line (You can use a ceramic resistor too but with heatsink). Without the bulb my charger capacity was only 2,5-3Amps, with the bulb I can charge up to 6Amps. I hope it helps stg! 0 WaqasB1 It starts with a jerk and then turns off. What is wrong with that ? Try hooking up an old cooling fan from a old case as a load. 0 AdamS504 WaqasB1 I use an ATX by Cooler Master (V1000) Thank you. More Comments Post Comment Categories Circuits. This is important! as it could result in a potentially dangerous or even lethal situation due to the high voltages inside the PSU if you decide to dismantle it. Also make sure that the metal box of the PSU is correctly earthed or grounded. You are responsible for your own safety!. The standard PC power supply unit has two safety mechanisms that prevent it from being switched “ON” without the motherboard attached. You can keep the 20-pin Molex connector attached and connect directly into it or cut it off completely and group together the individual wires keeping the same colours together, reds to reds, blacks to blacks etc. You can connect the same coloured wires together using crimp connectors or posts, is the same thing. Some of the other individual coloured wires we need to keep separate as detailed below. When pin 14 is momentarily or permanently connected to ground via a switch, the power supply will turn-ON. Then any standard power resistor below 5 Ohms will do. Remember though that this resistor will get HOT.I used a red LED in series with a 220 Ohm current limiting resistor connected between pins 8 and pin 7, (ground) for this power ready light but anything similar will do, its only indication. If you only have three red wires, another wire (sometimes pink) must be connected to them. But check this first. You can test the output voltages using a multimeter or connecting a 12V bulb into the different sockets to see if the PSU works.The newer ATX12V pin outs and colours are given in the following table for reference. Note that some ATX12V power supplies with a 24-pin motherboard connector may not have the -5V (pin 20) white lead. In this case use the older ATX power supplies with a 20-pin connector above if you need the additional -5V supply. The power supply unit uses switching regulators to maintain a constant supply with good regulation and short circuit protection cause the unit to shutdown and be re-powered immediately if something goes wrong. Also the ATX PSU requires a certain amount of fresh air to keep it cool inside which may not be possible when laid onto a bench. Not bad for something that would otherwise get thrown away but remember, unplug from the mains supply first before you start any modifications as you are the only person responsible for your own safety!. Please fill all fields. But from my school days I had a interest in Electronics. During this lockdown my TV broke. I just wondered to see whether I can try to repair it with the help of a friend who’s field is electronics. But my knowledge of it is the one we had around 60s. In the mean time I came across your site, sort of accidently. It took me back to my Advanced Level in school days. Your language is superb, things are well explained in very simple but clear terms. Thanks very much and wish you all success in all your affairs. I’m hoping to just have one PSU, and inside the case, at that ?? Since you said “small load”, the higher the resistance the smaller the power consumption, which means smaller load. Go to Amazon.com, search for “AT Power Supply Breakout”, then peruse the results and choose the module that “suits your fancy”. It does no good to merely “turn on”, if your load, say on the 12V line, puts the 5V out of regulation and the PSU shuts down. Further some PSU may also need a load resistor on the 3.3V rail as well, but more often high end or server grade rather than consumer grade. Ok, but how can I restart it?? I checked the internal fuse and it’s ok, When I turn it back on I get only.7 VDC from the 12 volt pin. I use this a lot and would love to keep using it. Thx for your help. If that doesn’t do it, you may have blown one of the transistors. But I need pin voltage configuration (ATX Cable 24 pin). It would require a transformer with a higher winding ratio and upgrade at least the capacitors and rectifier diodes, as well as changing the feedback circuit for regulation and the protection sensing. In short, if you want a 36V PSU, buy one ready made to be a 36V PSU. No resister required But how to switch off SMPS with out unplugging mains card every time? The hardware circuit might be located in the PS itself. Let us know what your result is. I’ve connected a digital volt amp meter and selector switch for selecting voltage. For that unit i didn’t need that small power resistance between 5v and gnd. It is immediately stopping without power resistance. I’ve connected a 5w, 22 ohm resistor which was available to me. It is working but not all the time. Sometimes power is getting on but sometimes not. Moreover after completion, when packed everything, it is not at all giving output after starting for a second. What’s the problem? Can anybody help? They state 10 ohm resistor not 22 ohms. Your dummy load is not pulling enough current at 22 ohms. If you have a second 22 ohm resistor or even better 3 of them, connect all in parallel to increase current. Repair the existing charger or purchase a PSU of appropriate voltage. Repairing it would be easier than modifying another psu anyway. What am I missing? Not trying to be a smart A, just trying to understand. And b.t.w. Thanks for all this instruction I am really liking being able to use the power supply for my ultimate project. It makes it much easier to turn it off that way. I pulled a working one out of an old (approx 10 year old) pc. Aside from size everything else should be the same, right. The Model is: PC8046 Will Power Damage. For this reason, we recommend you read this article with which you will learn How to turn on an ATX power supply without the PC motherboard? In this case, you may have seen the term ATX which stands for “Advanced Technology Extended”. ATX refers to a second generation power supply. This device is installed in the computer and converts alternating current from electrical energy into direct current. In this way, devices are protected from voltage surges or power supply problems. Also, some models have a switch that is located at the rear; This mechanism serves to avoid unnecessary consumption of electrical energy by “stand by”. Also, ATX power supplies can be integrated into old and new microprocessors. For this, you can follow the steps that we explain below. With these instruments, you can take the next step. When this is done, proceed to make a bridge between wires 14 and 15 (the green and black wires, respectively). The green wire is used to turn on the power supply when it is connected to ground, while the black wire acts as ground. This way you can determine if the power source is working properly. For this reason, the voltmeter becomes an essential tool when fixing a computer when it does not turn on or boot. These power supply units (PSU) offer fairly well-regulated, well-filtered, and high current sources. ATX PSUs make a decent bench supply. So here, we offer ATX power supply short pins to turn on instructions. These show which color wires on the PSU to short together to start the supply. Unfortunately, you can’t just plug it in to an AC outlet and go. In fact, inside the computer, power up is done via the motherboard. It sends an activation signal to the supply whenever you press the Power button on and off. So how do you create such a signal yourself without a computer. We cover that below. To activate the full-current capable part of the power supply, the motherboard connects the pin with the green wire on it to ground. You can do the same by manually connecting this green wire to any one of the black (ground) wires in the same connector. If no fan, or the fan does not work, measure the voltage with a multimeter. Indeed, you can read across any of the red, yellow, or orange wires and ground (black wires) for 5 and 12 volts. A few supplies may even have a lamp to show that they’re running. A load that draws one or two amps is often sufficient. You can get this lost by connecting a computer fan to the 12-volt output. The red and black wires of any of the accessory plugs offer 12 volts DC. An incandescent lamp also does the loading job nicely. But if you use the supply under constant load, then don’t worry about meeting these minimal load needs. Your constant load does that automatically. E.g. We powered a 5-volt WiFi router with an ATX PSU. It indeed worked quite well, without adding any minimal load. Since computer power modules cost little these days, they make great DC voltage sources. That is, they do as long as the load you put on them draws enough current, but not too much. Especially true if your PSU makes lots of RF hash noise on its output lines. This is a common trait of switching power supplies, particularly those of cheap design. While we use computer PSUs in a pinch, these adapters work best with computers and other IT equipment. But not so much other non-IT equipment, especially when powering these devices indefinitely. But honestly, if you do it right, the risks of damage to load devices is pretty low. We’ve yet to destroy any 12 or 5 volt devices. From Instructables.com. Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage.While an ATX power supply is connected to the mains supply, it always provides a 5- volt standby (5VSB) power so that the standby functions on the computer and certain peripherals are powered. ATX power supplies are turned on and off by a signal from the motherboard. They also provide a signal to the motherboard to indicate when the DC voltages are in spec, so that the computer is able to safely power up and boot. The most recent ATX PSU standard is version 2.31 as of mid-2008.Several direct-current voltages are required, and they must be regulated with some accuracy to provide stable operation of the computer. When the computer is powered down but the power supply is still on, it can be started remotely via Wake-on-LAN and Wake-on-ring or locally via Keyboard Power ON (KBPO) if the motherboard supports it. This standby voltage is generated by a smaller power supply inside the unit. The standby power source was a small linear power supply with a conventional transformer, which was later changed to a switching power supply, sharing some components of the main unit due to cost- and energy-saving requirements.The Apple II, also introduced in 1977, was noted for its switched-mode power supply, which was lighter and smaller than an equivalent linear power supply would have been, and which had no cooling fan. The switched-mode supply uses a ferrite-cored high frequency transformer and power transistors that switch thousands of times per second. By adjusting the switching time of the transistor, the output voltage can be closely controlled without dissipating energy as heat in a linear regulator. The development of high-power and high-voltage transistors at economical prices made it practical to introduce switch mode supplies, that had been used in aerospace, mainframes, minicomputers and color television, into desktop personal computers. Now all modern computers use switched-mode power supplies, which are lighter, less costly, and more efficient than equivalent linear power supplies.In the lower voltage range, around 115 V, this switch is turned on changing the power grid voltage rectifier into a voltage doubler in delon circuit design. As a result, the large primary filter capacitor behind that rectifier was split up into two capacitors wired in series, balanced with bleeder resistors and varistors that were necessary in the upper input voltage range, around 230 V. Connecting the unit configured for the lower range to a higher-voltage grid usually resulted in an immediate permanent damage. When the power-factor correction (PFC) was required, those filter capacitors were replaced with higher-capacity ones, together with a coil installed in series to delay the inrush current. This is the simple design of a passive PFC.The first active PFC circuits just delayed the inrush. Newer ones are working as an input and output condition-controlled step-up converter, supplying a single 400 V filter capacitor from a wide-range input source, usually between 80 and 240 V. Newer PFC circuits also replace the NTC -based inrush current limiter, which is an expensive part previously located next to the fuse.As more peripherals were added, more power was delivered on the 12 V rail. However, since most of the power is consumed by chips, the 5 V rail still delivered most of the power. The ?12 V rail was used primarily to provide the negative supply voltage to the RS-232 serial ports. A ?5 V rail was provided for peripherals on the ISA bus (such as soundcards), but was not used by any motherboard other than the original IBM PC motherboard.Once the output power is ready to use, the Power Good signal tells the digital circuitry that it can begin to operate.In a common variant found in tower cases, the line-voltage switch was connected to the power supply with a short cable, allowing it to be mounted apart from the power supply.For some power supplies the repeated restarting is audible as a quiet rapid chirping or ticking emitted from the device.In ATX-style systems, the front-panel power switch provides only a control signal to the power supply and does not switch the mains AC voltage. This low-voltage control allows other computer hardware or software to turn the system on and off.In order to supply large amounts of low-voltage power to the Pentium and subsequent microprocessors, a special power supply, the voltage regulator module began to be included on motherboards. Newer processors require up to 100 A at 2 V or less, which is impractical to deliver from off-board power supplies.Power supplies for those computers regulate the 5 V output precisely, and supply the 12 V rail in a specified voltage window depending on the load ratio of both rails.Jumpers or dip switches set the output voltages to the installed CPU's specification. When newer CPUs required higher currents, switching mode voltage regulators like buck converters replaced linear regulators for efficiency.Rarely, a linear regulator generated these 3.3 V, supplied from the 5 V and converting the product of voltage drop and current to heat. Later regulators managed all the 3.3, 5 and 12 V rails. Cutting the pulse by the voltage regulator the ratio of the 3.3 and 5 V is controlled. Some of these PSUs use two different chokes, feeding to the 3.3 V rail from the transformer to manage changing loads by pulse with ratio between the 3.3 and the 5 V outputs.Higher maximum power consumption required the buck converters no longer fed from the 5 V and changed to a 12 V input, to decrease the current required from the power supply.Developed by the Server System Infrastructure (SSI) forum, a group of companies including Intel, Dell, Hewlett-Packard and others, that works on server standards, the EPS form factor is a derivative of the ATX form factor. The latest specification is v2.93.As with later versions of the ATX PSU standard, there is also no ?5 V rail.A sufficiently large current can cause serious damage in the event of a short circuit, or can melt the wire or its insulation in the case of a fault, or potentially start a fire or damage other components. The rule limits each output to below 20 amps, with typical supplies guaranteeing 18 A availability. Each rail delivers up to a limited amount of current through one or more cables, and each rail is independently controlled by its own current sensor which shuts down the supply upon excess current. Unlike a fuse or circuit breaker, these limits reset as soon as the overload is removed. When the assignment of connectors to rails is done at manufacturing time it is not always possible to move a given load to a different rail or manage the allocation of current across devices.Both may (and often do) contain current limiting controllers. As of ATX 2.31, a single rail design's output current can be drawn through any combination of output cables, and the management and safe allocation of that load is left for the user. A multiple rail design does the same, but limits the current supplied to each individual connector (or group of connectors), and the limits it imposes are the manufacturer's choice rather than set by the ATX standard.Total power requirements for a personal computer may range from 250 W to more than 1000 W for a high-performance computer with multiple graphics cards. Power supplies are designed around 40 greater than the calculated system power consumption. This protects against system performance degradation, and against power supply overloading. Power supplies label their total power output, and label how this is determined by the electric current limits for each of the voltages supplied. Some power supplies have no-overload protection.Some graphics cards (especially multiple cards) and large groups of hard drives can place very heavy demands on the 12v lines of the PSU, and for these loads, the PSU's 12 V rating is crucial. The total 12 V rating on the power supply must be higher than the current required by such devices so that the PSU can fully serve the system when its other 12 V system components are taken into account.Climate Savers Computing Initiative promotes energy saving and reduction of greenhouse gas emissions by encouraging development and use of more efficient power supplies. 80 Plus certifies a variety of efficiency levels for power supplies and encourages their use via financial incentives. Efficient power supplies also save money by wasting less power; as a result, they use less electricity to power the same computer, and they emit less waste heat which results significant energy savings on central air conditioning in the summer. The gains of using an efficient power supply are more substantial in computers that use a lot of power.For example, a 900-watt power supply with the 80 Plus Silver efficiency rating (which means that such a power supply is designed to be at least 85 efficient for loads above 180 W) may only be 73 efficient when the load is lower than 100 W, which is a typical idle power for a desktop computer. Many power supplies create their 3.3 V output by down-regulating their 5 V rail, or create 5 V output by down-regulating their 12 V rails. The two rails involved are labeled on the power supply with a combined current limit. For example, the 5 V and 3.3 V rails are rated with a combined total current limit. For a description of the potential problem, a 3.3 V rail may have a 10 A rating by itself ( 33 W ), and the 5 V rail may have a 20 A rating ( 100 W ) by itself, but the two together may only be able to output 110 W. In this case, loading the 3.3 V rail to maximum (33 W), would leave the 5 V rail only able to output 77 W. Higher-quality power supplies can be over 80 efficient; as a result, energy-efficient PSUs waste less energy in heat and require less airflow to cool, resulting in quieter operation.Therefore, it is important to match the capacity of a power supply to the power needs of the computer. The curve varies from model to model (examples of how this curve looks can be seen on test reports of energy-efficient models found on the 80 Plus website ).Opposite the wire bundle is the back face of the power supply, with an air vent and an IEC 60320 C14 connector to supply AC power. Historically they were mounted on the upper part of the computer case, and had two fans: one, inside the case, pulling air towards the power supply, and another, extracting air from the power supply to the outside. Many power supplies have a single large fan inside the case, and are mounted on the bottom part of the case. The fan may be always on, or turn on and vary its speed depending on the load.Common certification marks for safety are the UL mark, GS mark, TUV, NEMKO, SEMKO, DEMKO, FIMKO, CCC, CSA, VDE, GOST R mark and BSMI. The CE mark is required for power supplies sold in Europe and India. A RoHS or 80 Plus can also sometimes be seen.The connector has 20 or 24 pins. One of the pins belongs to the PS-ON wire (it is usually green). This connector is the largest of all the connectors. In older AT power supplies, this connector was split in two: P8 and P9. A power supply with a 24-pin connector can be used on a motherboard with a 20-pin connector.Most of them have four wires: two black, one red, and one yellow.In some cases, it can be used as an auxiliary connector for Accelerated Graphics Port (AGP) video cards. Its cable configuration is similar to the Peripheral connector. Each PCI Express 6-pin connector can output a maximum of 75 W. It allows either a six-pin card or an eight-pin card to be connected by using two separate connection modules wired into the same sheath: one with six pins and another with two pins. Each PCI Express 8-pin connector can output a maximum of 150 W. The pin assignment of the detachable cables is only standardized on the output end and not on the end that is to be connected to the power supply. Thus, the cables of a modular power supply must only be used with this particular modular power supply model.The low profile of the power supply fits easily into these systems.For example, genuine Dell power source uses 1-Wire protocol to send data by third wire to the laptop.