ABOUT SMPS AND TROUBLESHOOTING  

ABOUT SMPS AND TROUBLESHOOTING


SMPS IS Switch Mode Power Supply. It is mainly used to convert AC to DC.SMPS are of two types AT and ATX.In AT SMPS system we have to manually Shutdown the computer. After giving Shutdown command “It is now safe to turn off your system” message appears then press the power button to shut down. In ATX SMPS shutdown is automatic, that is just give the Shutdown command. Now we are using ATX Smps.


TO CHECK WETHER SMPS IS WORKING OR NOT


Take a small piece of wire and connect one end in GREEN wire port and other in the GREY. Switch ON the supply if the fan in the smps is working the smps is good. If not open the cover and check whether the Capacitors inside the Smps is bulged on the top. If bulged replace the capacitor with the same value of the earlier.Check the voltages with a multimeter.



SMPS CONNECTORS


Amphenol connector gives power supply to Mother Board


Mole x gives power supply to IDE drives



Mini Molex gives power supply to floppy drive.



SMPS WIRES IN ATX



WIRE VOLTAGE FUNCTION



Black 0 Ground

Blue -12 Serial Data

Brown/Violet +3.3 Sensor

Gray +5 Power good supply

Green +5 Power supply on/off

Orange +3.3 D Ram Refreshing

Purple +5 Stored by voltage

White -5 Refreshing Ram

Yellow +12 Motor Rotation

Red +5 Logic circuit