Repair an LCD Monitor Power Problem at Home

RugSmug

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posted on 12 years ago — updated on 1 second ago

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If you have a LCD monitor that won't turn on, it's most likely a power problem. If you have a soldering iron, you can fix your monitor's power problem with a few capacitors. Fixing your LCD monitor's power issue at home can save you hundreds of dollars, and isn't too difficult if you're familiar with electronics. This wikiHow guide will teach you how to repair an LG L196WTQ-BF LC monitor with a power problem, but most monitors will follow similar design and can generally be fixed using the same instructions. Note: For other monitors, different capacitors will be needed.

Things You Should Know

Most LCD monitor power issues are due to bad capacitors.
You'll need to purchase new capacitors for your monitor, which vary by model.
Remove the bad capacitors and solder their replacements onto the power board.

Remove the stand. It uses four screws and can be easily removed from the back of the monitor. This is shown by the red arrows in the picture.

Lay the monitor down carefully, backside up. Remove the other 4 screws that are holding down the case.

Inspect the back of the monitor. This next part is the hardest step, and this might damage the edges of the screen cover, but usually they aren't visible. The monitor cover is made up of 2 plastic covers joined at the sides and in order to open you must force a separation. The picture shows that the screwdriver was placed in the middle of the covers and made a small space. The screen is held down by plastic locks around the screen and you will use the screwdriver to open these locks, this is why the slotted (Straight) screwdriver is mandatory.

Remove the cover from the back of the monitor. Using this small space, turn the screwdriver to cause the locks to come undone, using this technique you must go around all the sides of the monitor. This step gets easier and easier as you progress, so if you're having trouble starting don't worry it will get easier.

Once the cover is removed the main body of the monitor can be seen.

Remove the side panel.

Remove the tape and unplug the cable that is located at the top. This is the display panel signal cable.

Remove the tape and unplug the cable that is located at the bottom. This is the control panel cable. This cable has a lock, so it must be pressed and taken out at the same time.

Unplug the cable that is located to the side. this also has a lock and must be pressed to release. This four cables are the back light plugs.

Turn over the metal casing to reveal the driver board and power board. You must remove the power cable that is going to the driver board shown by the arrow.

Remove the power board by removing the 4 screws as shown by the picture.

The capacitors are located at the bottom right, and the cluster is shown in this picture. The capacitor list and location for this specific model is listed below. The locations should be listed on the board itself.

Remove the bad capacitors with a soldering iron. Flip the power board and use the soldering iron to the metal stubs that relate with the capacitors that needs to be removed. This should create a new hole for the new capacitors to fit in.