How to Fix a LCD Monitor Power Problem

Last Updated: March 11, 2023

It is estimated that there are around one billion personal computers around the world, and with every single desktop computer, there is also a monitor attached to it. Every day, hundreds of computer monitors break down, and if you have a LCD monitor that you bought fairly recently and have questioned why it won't turn on anymore, it's most likely a power problem that can be fixed to save you hundreds of dollars. This guide will specialize on the computer monitor model LG L196WTQ-BF, 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.

Steps

1
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.
2
Lay the monitor down carefully, backside up. Remove the other 4 screws that are holding down the case.

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3
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.
4
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.
5
Once the cover is removed the main body of the monitor can be seen.
6
Remove the side panel.
7
Remove the tape and unplug the cable that is located at the top. This is the display panel signal cable.
8
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.
9
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.
10
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.
11
To remove the power board you must remove the 4 screws listed by the picture.
12
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.
13
Now using a soldering iron you can remove the bad capacitors. 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.
14
Now fit the capacitors according to the placement and solder them in.
15
Now reverse through this guide to reassemble the monitor.

Community Q&A

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.
Question

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

XxN00B Slayer456456Xx

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.
Question

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.

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