How to replace a power supply on an LCD monitor

Written by shoaib khan
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How to replace a power supply on an LCD monitor
A damaged power supply unit will cause an LCD monitor to malfunction. (Computer LCD monitor isolated on white background image by Dmitry Rukhlenko from Fotolia.com)

A power supply in an LCD monitor provides power for the screen to turn on and display images. When the power supply unit (PSU) goes bad, the monitor starts to malfunction or does not power up. One of the main reasons why power supplies malfunction is because of damaged capacitors; oftentimes, replacing the broken power supply is a simpler option than trying to fix the capacitors.

Skill level:
Moderately Challenging

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Things you need

  • User manual
  • Screwdriver
  • Flat-tipped implement

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Instructions

  1. 1

    Unplug the monitor power cable. You should never attempt to disassemble an electronic component without first detaching it from its direct power source.

  2. 2

    Remove the screws from the back of the monitor and along the edge of the screen. Depending on manufacturer and model, LCD monitors will have screws located on different parts of the monitor's body. Once the screws are off, use a flat-tipped tool, such as a knife or a screwdriver, to pry the monitor open by dislodging the two halves; be careful not to tear wires connecting the two halves.

  3. 3

    Locate the power supply unit and take its metal casing off. Once again, different models of LCD monitors will have the unit placed in different locations. With the casing undone, unplug cables running from the power supply to other internal components. Mark the cables that you unplug from the power supply--you will have to plug them back in to the new unit.

  4. 4

    Dislodge the power supply from its dock. In some monitors you might have to undo screws that hold the power supply unit in place. Remember the orientation of the unit as it was placed, because you will have to insert the new unit in exactly the same way.

  5. 5

    Insert the new power supply into the dock and screw it in place. If you do not have a new power supply, read the label on the existing one to order a new one from the manufacturer or from a third-party supplier. Obtain a power supply unit that is compatible with your LCD monitor; never try to use a generic spare. After installing the new unit, plug in the cables exactly as they were in the old unit.

  6. 6

    Put the power supply casing back on and reassemble the LCD monitor frame. Gently clasp the two halves of the monitor shut, making sure you have reattached all cables that you unplugged to take the monitor apart. Close the casing, tucking away all cables neatly so they do not get in the way of the monitor casing.

  7. 7

    Put all the screws back on. Once done, you should have no leftover pieces (screws or cables).

Tips and warnings

  • Refer to your LCD monitor user manual for any recommendations or advice from the manufacturer regarding disassembly. Take note of where the screws are and the locations of any locking mechanisms used to attach the two halves of the casing. Follow instructions (if any) closely.
  • Do not attempt to replace the power supply unless you are absolutely sure the part is malfunctioning. Power supply units are dangerous components, because they might cause serious injury or damage the monitor beyond repair if handled improperly.

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