ATX Smps troubleshooting is not as hard as it seems. By using a proper check listing system, you can certainly troubleshoot and fix an ATX switch mode power supply without much fuss.
Now let me share with you my step-by-step checklist…
Oh, and in case, you need more in-depth instructions - detailed, easy to follow photos, diagrams and things like that – then you should check out the following smps repair manual.
I've been using this manual as my reference for repairing all types of smps including video game consoles, notebooks, LCD TVs etc.
Take a look here (opens in new window).
Now, let's take look at the following ATX smps troubleshooting checklist...
• Switch on power supply and conduct necessary measurement. If overvoltage is the cause, then you'll see increments in the 5 and 12 volts line.
• Remove the casing. The components are likely covered with linen and dust. Get rid of those using a brush and mini vacuum.
• Examine the power supply fan. This is fairly obvious, but some folks might overlook it. Always check the fan when conducting ATX smps troubleshooting. Overheating is one of the leading causes of smsp failure.
• Dual Schottky barrier rectifiers are found in many ATX power supplies. AC wave is changed to DC volts via this barrier rectifier so you should examine this as well. Use an analog meter with the setting at X10K ohms.
• Examine components carefully. The cause of failure can be attributed to common component issues like decayed glue, components damaged/dislodged etc.
• Once you've detected the problem - let's say one or more capacitors are not working then replace them according to specification. The capacitors are easy to replace.
• As for decayed glue, you should gently scrape them off the components and clean using quality thinner solution.
• Connect the smps to an unused motherboard (to be on the safe side) along with hard disk to measure the overall performance including output voltages.
If everything is well and good, you may connect it to the actual CPU. If it works for the unused motherboard, then it should work for your intended CPU.
Once again, if you need a manual on repairing smps complete with easy-to-follow pictures and diagrams, just go to this site.
