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Understanding Power Supply in Computers: Voltages, Measurement, and Replacement

This presentation covers essential aspects of computer power supply systems. By the end, you will be able to identify input and output voltages, measure DC output voltages, explain power distribution within a computer, and demonstrate proper methods for removing and replacing a power supply. Additionally, you will learn to compute the power consumption of a PC, specifically focusing on Intel Pentium II power requirements. Gain insights into ATX and AT motherboard connectors, voltage types, and the significance of the Power Good signal.

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Understanding Power Supply in Computers: Voltages, Measurement, and Replacement

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Presentation Transcript

  1. Presentation 2 – The Power Supply

  2. Objectives At the end of this presentation, you will be able to:

  3. Identify the input and output voltages of the power supply. • Demonstrate the proper method to measure the DC output voltages of the power supply. • Explain how power is distributed throughout the computer. • Demonstrate the proper method to remove and replace the power supply in the computer. • Compute the power consumption of the PC.

  4. intel pentium II The Power Supply.

  5. The Power Supply AC Receptacle FAN On/Off Switch

  6. Power Supply Input Voltage • 100 to 125 VAC @ 60 Hz • 200 to 250VAC @ 50 Hz

  7. Motherboard Form Factors • AT-Type • ATX-Type

  8. AT Motherboard 13.5” 12”

  9. 9.6 ” intel pentium II ATX Motherboard 12 ”

  10. ATX Mother-board

  11. ATX Power Distribution

  12. Power Supply Output VoltagesATX-Type • +5 Volts • +12 Volts • -12 Volts • -5 Volts • +3.3 Volts

  13. ATX Motherboard Power Connector

  14. 20-Pin Power Connector

  15. 24-Pin Power Connector

  16. 2 X 2 Connector 2 X 10 ATX Connector

  17. Edge View of Motherboard.

  18. A Second 2 X 2 Motherboard Power Connector Supplies Processor Core Power (+12 Volts)

  19. AT Power Distribution

  20. Power Supply Output VoltagesAT-Type • +5 Volts • +12 Volts • -12 Volts • -5 Volts

  21. Power Connector

  22. Motherboard Power Connectors Black Wires P8 P9

  23. Some connectors are held in place by a latch. Latch

  24. +5V -5V +5V Ground +5V Ground P9

  25. -12V +12V +5V Ground Power Good Ground P8

  26. The Power Good Signal • +5 Volt signal generated by the power supply. • It indicates that the power supply has passed its self test and that its output voltages have stabilized. • Usually occurs within first 0.5 seconds. • Prevents the system from running under bad or unstable power conditions.

  27. Large Molex Connector

  28. 4-Pin Molex Connector +12V Ground +5V

  29. Berg Connector

  30. 4-Pin Berg Connector +12V Ground +5V

  31. Grasp the connector by the shell… Never by the leads.

  32. Replacing the Power Supply

  33. Disconnect the AC Power Cord.

  34. On-Off Switch

  35. Power to Motherboard

  36. The Power Supply is held in place by four screws.

  37. Power Supply

  38. Reinstall the power supply.

  39. End

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