Repair an LCD Monitor Power Problem at Home

Easily replace bad capacitors on an LCD monitor to fix power issues

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Last Updated: April 19, 2023

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.

Steps

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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.
Remove the other 4 screws that are holding down the case.

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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.
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.
This is the display panel signal cable.
This is the control panel cable. This cable has a lock, so it must be pressed and taken out at the same time.
this also has a lock and must be pressed to release. This four cables are the back light plugs.
You must remove the power cable that is going to the driver board shown by the arrow.
The capacitor list and location for this specific model is listed below. The locations should be listed on the board itself.
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.
Fit the capacitors according to the placement and solder them in.
Reverse through this guide to reassemble the monitor. You should now be able to power on your LCD monitor.

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Question

My Acer LCD powers off after 15 minutes. I already changed the big capacitor but it didn't help. Do you have any other suggestions?

Community Answer

You may try re-checking the heat sink of your Secondary Diode and/or the Power IC.

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My LCD monitor is brighter than normal and the pictures are changing slowly. What should I do?

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Community Answer

You may need to turn down the brightness of your monitor. Then put it in sleep mode. Turn off your computer. Then turn back up your computer, and monitor.

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My flat screen LCD monitor is showing random colors. How do I fix it?

Community Answer

Invert colors may be on, so you may need to go into settings and deactivate it. If this doesn't work, contact your tech support.

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Tips

Some soldering irons do take a long time to heat up, so it is recommended that you plug in after you remove the monitor casing.

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If your having trouble removing the casing, pick a spot where you might see the least damage and use a lot of torque on the screwdriver to create a pocket of space. This is a lot better then damaging multiple areas.

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For computer parts like these, it is recommended that you ground yourself before starting to remove any static electricity that might cause harm to the hardware.

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Warnings

The power cable should be unplugged at the start and every step of this guide.

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Things You'll Need

For Monitor LG L196WTQ-BF LCD monitor, the capacitors needed are:
- 2 x 1000uf 25v caps at C206 and C202
- 2 x 1000uf 16v caps at C205 and C208
- 1 x 680uf 25v cap at C203
- 1 x 470uf 25v cap at C207
Slotted (straight) screwdriver and Philips screwdriver
Soldering iron and solder