There are many failures in a monitor, and unfortunately many of them cannot be repaired; However, a flaw that many people suffer from is that the monitor does not turn on when you press the power button, but that does not necessarily mean that the device is dead, as the button could simply have been damaged and Simply changing it would be enough, or it could be some other kind of problem that also has a solution.
What should you watch out for if your monitor won’t turn on?
The monitor power button is by far the most used of this device, as the redundancy is worth it, it is used to turn the device on and off. Even if your monitor is of good quality, that does not relieve it of problems due to wear and tear in use, and obviously a power button on a monitor does not have the quality, for example, of a key. on a keyboard that’s built to withstand millions of keystrokes.
What we mean by this is that the first thing you need to consider is whether the ignition button it behaves appropriately whether it is not “dancing” and, if it is one of those that has a light when the monitor is on, whether that light is on or not. There is a good chance that the button has been damaged from use and the solution would be as simple as changing its mechanism for a new one, usually a simple spring or, if the button “dances” a lot, it is. probable that one of the plastic pins that hold it and by 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 lights up when pressed, there are a lot of bulletins that the problem lies with the power supply to the monitor, and more precisely in his capacitors, because if they are not in good condition, they could be the culprits that the current does not reach the monitor and it will not turn on. An electric capacitor stores the 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 need to do, and in advance we warn you not to do it if the monitor is under warranty (obviously in this case use the warranty to get it repaired or get a new one) is to disconnect the monitor. monitor from any cables and remove the screws on the back to be able to remove the outer case and access its interior. Identifying bad capacitors is easy – just visually inspect them and verify that none are swollen or burnt.
Once the bad condition capacitors are located, the next step is obviously to change them, and for that you will only need a fine tip soldering iron And a small 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 can thus remove them. Before removing the capacitors, we recommend that you make a note of what position each is in and with what polarity, and then, when replacing them, leave everything as it is.
Once out, the easiest way is to take them to an electronics store so that you can purchase the same ones, although you can also just note the microfaradios (µf) and the volts (V) of each to buy them. You should know that when it comes to getting a replacement, the microfarads should be exactly the same while the volts can be the same or higher, but never lower.
Once you have the capacitors, which won’t cost you more than a few cents per unit, you will simply need to insert them into the holes in the PCB where you originally removed them from and apply heat with the iron. solder and tin, solder them again. It is important to do this by inserting them in the correct polarity and for this we signal it when removing them. Once the tin is dry and cool, it is advisable to cut off the excess pins on the opposite side of the PCB so that it does not come into contact with anything.
This process is quite simple, even if it is true that it requires a little “handyman” for that, but for very little money one can give a second life to a monitor which does not turn on but whose panel continues to function well.