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How to fix a monitor that won’t turn on when you press the button

There are really many possible failures that a monitor can suffer, and unfortunately many of them cannot be repaired; However, a fault that many people suffer is that the monitor does not turn on when pressing the power button, but this does not have to mean that the device has passed away, since the button could have simply been damaged and simply changing it would be enough , or it may be another type of problem that also has a solution.

What should you watch if your monitor won’t turn on?

The power button of the monitor is by far the most used of this device, since redundancy is worth it, it is used to turn the device on and off. Even if your monitor is of good quality, this does not exempt it from problems due to wear and tear with use, and obviously a power button on a monitor does not have the quality of, for example, a key on a keyboard that is designed to withstand millions of keystrokes. .

What we mean by this is that the first thing you should look at is whether the power button he behaves properly, that he does not “dance” and, if he is one of those who has a light when the monitor is turned on, whether this light is turned on or not. There are many possibilities that the button has been damaged by use and the solution would be as simple as changing its mechanism for a new one, usually consisting of a simple spring or, if the button “dances” a lot, it is likely that a of the plastic pins that hold it and with sticking it we will have solved it.

If apparently the button is in good condition and especially if it is one of those with light but nothing turns on when pressed, there are many ballots that the problem lies in the monitor’s power supply, and more specifically in its capacitors, since if they are not in good condition, they could be the culprits that the current does not reach the monitor and that it does not turn on. An electric capacitor stores charge and releases it according to the demand of the device, and over time they spoil quite easily if they are not of good quality.

How to change a bad capacitor in a monitor?

The first thing you should do, and in advance we warn you not to do it if the monitor is under warranty (obviously in this case make use of the warranty to get it repaired or give you a new one) is to disconnect the monitor from any cable and remove the screws from the back to be able to remove the outer casing and gain access to its interior. Identifying bad capacitors is easy: just visually inspect all of them and check that none are swollen or burned.


Once the capacitors in bad condition are located, obviously the next step is to change them, and for this you will only need a fine tip soldering iron And a little tin. At this point we recommend that you slightly heat the pins of the capacitors to be replaced so that the tin with which they are attached to the PCB melts and thus be able to remove them. Before removing the capacitors, we recommend that you write down in which position each one is and with what polarity and then, when replacing them, leave everything as it was.

Once taken out, the easiest thing is to take them to an electronics store to be able to buy the same ones, although you can also simply write down the microfarads (µf) and the volts (V) of each to buy them. You should know that when it comes to getting a replacement, the microfarads must be exactly the same while the volts can be the same or higher, but never lower.

Once you have the capacitors, which will not cost you more than a few euro cents each unit, you simply have to insert them into the holes in the PCB from where you initially removed them and applying heat with the soldering iron and tin, solder them again. It is important to do this by inserting them in the correct polarity and for that we point it out when removing them. Once the tin is dry and cold, it is advisable to cut the excess of the pins on the opposite side of the PCB so that it does not make contact with anything.

This process is quite simple, although it is true that it does require a little “handyman” for it, but for very little money you can give a second life to a monitor that does not turn on but whose panel continues to work well.