yes friend i checked that switch and the smps shows 5v standby power when connected to power and when i short the two wires its fan rotate for just one rotation and stops i checked it with some load on 5volt and 12 volt rail like cd-rom ..
I AM FACING PROBLEM WITH A 450W COMPUTER ATX SMPS THE PROBLEM IS WHEN I START THE SMPS WITH SHORTING ITS GREEN AND BLACK WIRE IT'S COOLING FAN ROTATES FOR WHILE AND STOPS IN THAT CASE HOW TO TROUBLESHOOT THE PROBLEM ? PLEASE TELL ME STEP BY STEP TROUBLESHOOTING. I HAVE CHECKED THAT THE 5V STANDBY IS OK. THANKS IN ADVANCE..:grin:
Hi peter,
It is normal to have +5v at the time of starting it is used as starting pulse to turn on the smps. .....
ATX power supply have a small so called standby power supply, independent from main power converter; this standby power supply assure 5Vsb to keep standby status of a PC and also to provide start-up voltage to main power converter (after start-up, IC control and drivers are supplied from 12V output); this small power supply start-up imediatly ATX power supply is connected to grid and can't be stopped/started from an external switch or by mainboard (don't have any start/stop mechanisme, to avoid any errors in suppling 5V standby to PC).
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