SMPS Problems and Solutions

SMPS Problems and Solutions

SMPS

SMPS Internal

What is SMPS ?

SMPS - Switched Mode Power Supply. An SMPS is  a Device to efficiently provide a regulated output voltage, from  different level of  the input voltage.S MPS transfers power from a source like the electrical power grid to a load  (Eg: Computer).

SMPS Connection Diagram

The SMPS in a conventional desktop system is designed to convert the 220V AC, 50HZ into +5V, -5V, +12V and +3.3 V DC

Diagram -SMPS

Tips For Power Supply Service

1. Be sure that the line- voltage  switch(120/220 Vac) is set correctly for your region.

2. Do Not Use a Splitter

3. Be sure that each output is within tolerence(Volatge tolerences are usually +or-5%

4. Verify that the power-supply connectors are attached to the motherboard drivers

5. Check the AC Input voltage with the help of a Multimeter

Troubleshooting SMPS

Problem 1: The Power doesn't come on.

Solutions

1. Check the Power from the wall socket

2. Check the Voltage Setting On the CPU

3. Check the  Power switch  of the Cabinet and  Front Panel of MotherBoard

4. Check the Power Supply Connections to the Motherboard

5. Check the SMPS without connecting it to the motherboard, you could see the two wire green and black which you have to short them (using any piece of wire/paper clip) in the 24 pin motherboard connector of the SMPS.

  Problem 2: The PC Powers on after the second or third try

Solutions 

1. Check the  Power switch  of the Cabinet

2. Replace  SMPS  (Get a Better Quality SMPS)

 Problem 3: The PC Powers on but nothing happens after that (no beep)

Solutions 

 1. Remove the last hardware component installed and check again

2. Replace  SMPS  (Get a Better Quality SMPS)

3. Check the power cables to the  Devices(Harddisk, DVD Drive etc)

 Problem 4: The PC Powers on beeps and stops. NO Power On Self Test (POST)messages

Solutions 

1. Check with another SMPS

2. This may be a Motherboard Problem.

 Problem 5: The PC Powers on runs POST but there is no display

Solutions 

1. Check the Monitor and the VGA Cable Connectons

2. Check with another SMPS

3. This may be a Display Card Problem

 Problem 6: There is a squealing/whistling/whining noise from SMPS when the PC starts

Solutions 

1. Check the SMPS Fan

2. Component problem with SMPS. Replace it 

Problem7: The PC freezes or reboots suddenly

Solutions 

1. Check the SMPS Fan (May be overheating Problem)

2. Replace the SMPS