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Basic Computer Troubleshooting – Merofuture

Table of Contents

Set Dead Problem

  • Check the power cord.
  • Open cover opposite I/O shield.
  • Check the SMPS, shots green and black wire.
  • Measure the output voltage of SMPS.
  • Remove all connectors and expansion cords.
  • Remove the motherboard from casing and put it on soft cloth, paper.
  • Connect back the SMPS power connectors and shorts the power switch.
  • If the motherboard doesn’t start replace it.
  • Replace the motherboard.

No display problem

  • Check the monitor.
  • Check the power cord of CPU.
  • Remove the cover opposite of I/O shield.
  • Firstly clear BIOS/ CMOS.
  • Check the voltage of CMOS battery.
  • Remove all expansion cords and connectors.
  • Remove the motherboard from casing.
  • Remove the RAM with new one. Try using different slot.
  • If there is VGA cards use a new card tray again.
  • Check the processor working or not.
  • If not replace it and check the display again.
  • If the above step doesn’t solve the problem and replace the motherboard check the display again.

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Auto restarting problem

computer auto restarting

  • Check the AC voltage.
  • Check if the is operating system. (F1, Del, F10, ESC, F6, F12)
  • Check if the CPU fan is connected properly or not and is running fast and smoothly or not.
  • Check the output voltage of SMPS using multimeter.
  • See if the hard disk reinstall the operating system and check if the system restart frequently or not.

SMPS (Switch Mode Power Supply)

  • Switch mode power supply is used to switch the alternating current (AC) voltage into direct current (DC) voltage which is required for our computer system to work. It is placed inside the casing of the computer and from it connections are given to all parts of computer including motherboard, hard drive, CD/ DVD drive, processor etc.
  • Block diagram of SMPS
  • SMPS block diagram
  • Orange – 3.3 V – 29 A
  • Yellow – +12 V – 20 A
  • Blue – -12V – 0.8 A
  • Red – +15 V – 2.5 A
  • White – -5 V – 0.5 A
  • Purple – +5 V – 2 A (Stand by (SB))
  • Black – Common
  • Green – PS on
  • Grey – +5 V – PG (Power Good)
  • Power Good (PG)
  • It checks all the output voltage of the SMPS and examines whether it works property or not within 0.1 – 0.5 seconds.
  • The power good signal prevents a computer from attempting to operate on imporper voltage and damage itself.

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