LG Monitor No Signal? Troubleshooting Guide

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LG monitors are one of the most used monitors in the market for their sheer variety in terms of specs and prices. However, that being said, they are not immune to most monitor problems, one of the most common being a “NO SIGNAL” sign.

For users who see this for the first time, it can seem scary, but in reality, it is anything but. A NO SIGNAL issue is a frequent and common occurrence with monitors, whether from LG or not. 

So, today, I am here to show you why you can get this NO SIGNAL error sign and what you can do to solve it. The details provided here are specifically for monitors from LG. Still, in some cases, they might also work for other brands. If the cap fits, wear it! 

What Causes the NO SIGNAL Error on LG Monitors?

Before we can jump into how to solve this error, we will take a brief look at the causes or sources of this problem. Being such a common issue means there is more than one reason for this error.

  • The power supply – not having enough power to power the monitor can lead to this error. 
  • Incompatible cables – the wrong connection means a weak signal. 
  •  Incorrect input selection – when the cable and input selection do not match up, that can be the cause your error. 
  • Resolution settings – having the wrong resolution selected can be too much for the monitor to handle, resulting in the NO SIGNAL error. 

Fixing LG Monitor NO SIGNAL error

Here we will jump into the details for each of the mentioned causes to see how we can solve these problems. While there is no specific order, I would recommend moving in ascending order because that is how I have seen most people receive their results fastest. 

Solving the Power Supply Problem!

One of the more common reasons I have personally seen this NO SIGNAL error resurfacing is because there is a problem with the power supply. This is why you should try this one before moving on to more complex problems. 

First, you should check that the PC is well connected to the power supply and that the connection is secure. You can also try checking the port to be absolutely sure. 

If you switch the main supply power off and then on, and the problem is gone, there you go! But if it is still there, then we will try this trick that you are probably tired of hearing. 

It is time to restart the computer. Now, we know everyone tells you to do this for everything. But there is a reason why it is such a popular solution – in most cases, this simple action actually does the trick. 

Before you turn it off, there is a little trick to doing this in a way that makes it most effective. First, you must turn off the monitor and unplug the computer. 

Wait for around half a minute, and then plug everything back. Here, make sure to turn on the monitor first and the computer second. 

What to Do When the Cables are Incompatible?

When the cables connecting the monitor do not work, that is obviously an issue. In the first step, we have already checked that the main power supply works. This means now it is time to check all the other cables. 

With time and usage, cables tend to lose their grip, so do not be alarmed if you find that you have a lost cable or two, especially if they are old. We will start checking all the other cables connected to our monitor.

A secure connection is the first thing to check here. Making sure that the connections at both ends are strong means that the connection is secure. Check this by slightly pulling on one end at a time. If it comes off, the connection is unsafe, and vice versa. 

Next, unplug these connections and then reconnect them. This will ensure that even if there is a connection problem, it does not remain. 

While reconnecting, check to see any visible obstructions in the site. Unfortunately, this could also lead to losing connection and, eventually, the error sign. 

If that has no effect, you should next check if any cables are damaged. This means frayed wires, tears and wears from usage, etc. If you suspect wires are damaged, a simple way to check is to replace the cable. 

Another possible trouble is not with the cable itself but with the connection. If you are currently using an HDMI connection, try swapping it with another, such as a DP cable. If there is an issue with the connection port, then this will solve it. 

The last thing to check here is the display cable being used. When purchasing the monitor, you should have received a DisplayPort cable along with the monitor. You must use this to ensure there are no issues with the display. If you do not have this, pick up a new one! 

I Selected an Incorrect Input, Now What?

If our monitors are set to the wrong input, the wrong message is being sent to the monitor, making it display the NO SIGNAL message. So we must use the correct input, for which we must first find the input cable. 

Almost every LG monitor I have seen, they support HDMI and DVI. DP, and VGA cables. These are common and readily available, making them very accessible too. After finding and identifying your cable, it is time to find the input button. 

This input button can be found in the bottom right corner on the back side of the monitor. In some cases, I have also seen this button located at the center on the backside. In either case, if you cannot find it, simply look at the back of the monitor. 

Once located, you have to now press this button, which will open an options tab on the monitor. Amongst these options, you will find all the possible cable connection listed above, and you have to select the one you are currently using (aka the one you saw right before checking the input button).

How to Adjust Resolution on an LG Monitor?

Our monitors do not come with one but a range of display resolutions. What happens here is that this resolution information is sent to the PC. Suppose the graphics card on our PCs has a higher resolution set. In that case, this information does not match what the monitor offers. And this mismatch results in the NO SIGNAL error. 

The quickest and easiest way to fix this is to reboot your PC using Safe Mode. I will suggest Safe Mode simply because while in this mode, the PC uses a lower resolution on its own. When the resolution has been lowered, it usually falls back into the resolution range our monitors come with, getting rid of the problem at hand. 

But this does not mean that you have to keep using Safe Mode. Once rebooted, you now have access to your monitor again. So, head right into the resolution settings and select a lower resolution than before as default. 

This will ensure you do not have to keep staying in Safe Mode, and the probability of this NO-SIGNAL error surfacing (for this reason) lessens.

How to Troubleshoot if Everything Fails?

This is the very last step of the process, where we disconnect our monitor and connect it to a different PC entirely.

Why? Because it allows us to see if the problem really lies within the monitor or the PC. If none of the above steps has worked for you, then this is the last check before you can take it to a professional. 

If the problem persists after connecting to a new PC set-up, there is clearly a hardware problem with the monitor. In this case, take it to a professional who can open it up and see what’s wrong. In the worst case, you might have to get a new monitor. 

If the problem goes away with a new set-up, then, unfortunately, the trouble lurks within your PC. This time you have to take the PC to a professional technician to have it checked. 

My Last Words

I admit that was not exactly short. But I think it is better to understand the problem at hand properly as it gives you the chance to fix it so that it does not happen again. 

I would also like to say that getting this NO-SIGNAL error message is something most people have dealt with at one point or another, so don’t let it scare you. 

Follow these steps (preferably to save time), and you will surely find a solution somewhere in there. In case you don’t, it is only a short trip to the technicians!

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