You have just bought a new LG TV and, as a result, you are experimenting with its various features.Being the first time you use a TV of this brand you still have to get used to it a bit and, for this reason, you still don't know how to behave with regards to HDMI cables and connections with other devices.That's how things are, right?Then let me help you clarify this.First of all, even before we get into the actual procedure on how to put HDMI on LG TVs, let me explain one thing: not all HDMI cables are the same.There are, in fact, several generations of HDMI that support different standards, resolutions and frame rates.The versions range from the first, HDMI 1.0 (which supports a transmission speed of 4.9 Gb / s, up to 165 Mpixel / s of video stream - 1080p at 60 Hz - and 8-channel audio) to the last, which consists in HDMI 2.1 (video resolutions up to 10K, 120Hz refresh rate, 48Gbps bandwidth, and eARC audio).More info here.Are you wondering why all this information?Here is the answer: if your new LG TV is highly performing, and you want to connect a console such as PlayStation 5 or Xbox Series X / S to it, to make the most of the features of both devices, you will need a latest generation HDMI cable. , i.e. 2.1, which supports high resolution and console frame rate.In addition, HDMI 2.1 cables are backwards compatible: they are adapted for use even in devices with older versions.Once this important aspect has been specified, I just have to wish you good reading and good continuation!Having made the necessary clarifications, the time has come to move on to the operational part of the matter and find out how to put HDMI on LG TVs.The first thing you need to do, therefore, is to physically proceed with the connection: locate the HDMI port of your TV located on the back or on the side of the same.Normally all TVs have at least one HDMI Standard Type A input (the most used type).In correspondence with the port (or ports) you will find the writing HDMI or HDMI IN and the number of the input (eg HDMI 1 / HDMI IN 1).At this point you must check that the device you want to connect also has an HDMI Type A (HDMI Standard) output, alternatively it could be Type C (Mini HDMI) or Type D (Micro HDMI).In this case you need the correct cable to make sure everything works as it should, otherwise you will end up with different connectors than the input and output ports of the devices.If the cable you have is correct, you just have to connect one end to the output port of the device and the other to the HDMI input port of your LG TV.In the case of Type A HTMI cable the two ends are identical, both have 19 pins and have a measurement of 3.9 mm x 4.45 mm.It also doesn't mean that your TV's HDMI inputs are identical.Often, one of the inputs has HDMI (ARC), an acronym for Audio Return Channel.This is a standard, introduced with HDMI 1.4, designed primarily for connecting audio peripherals.Its purpose was to eliminate the presence of multiple audio cables, bringing everything together in the HDMI 1.4 or higher cable.So, in principle, the ports don't have big differences between them and both can be used, but the HDMI (ARC) input should ensure better audio quality.Do you want to replicate the audio-video signal on two screens instead?So, in this case, you can use an HDMI splitter, which is a device that has one input port and several output ports.This allows you to replicate the signal from a single source to multiple devices, such as two TVs.Your TV, on the other hand, has only one HDMI input port but you want to connect multiple devices without having to connect and disconnect cables every time?So, in this case, you need an HDMI switch, that is a device that has, therefore, a variable number of input ports and only one output port.Once the device and TV are correctly connected via HDMI cable, you must select the correct source of the audio video stream on the TV to ensure that the signal is displayed on the screen.The source, in fact, is the channel on which the signal is located and corresponds to the HDMI input to which you connected the cable.To select the source, therefore, you have to act via the TV and the remote control.The most immediate way to do this is to turn on the TV, then press the Input button on the remote control (usually represented by the symbol of a cable) and, from the menu you see appear on the screen, select the HDMI [number] item using the directional arrows.On some types of TV, moreover, only the HDMI input in which the presence of a device is recognized will be accessible via the on-screen menu, so you don't even need to remember the number of the port you use.Once this is done, you will immediately see the audio-video signal of the connected device appear on the LG TV screen.In case you want to go and act on the settings of your connection between TV and device connected via HDMI, there are some things you can do.First, press the Settings button on your remote control (usually represented by a gear icon) and, from the menu you see appear on the left of the screen, go to the All settings option, using the directional arrows.At this point select the General item and, among the various options present, move with the directional arrows to the SIMPLINK item (HDMI-CEC) and press the OK button on the remote control (the central one) twice: the first to access the setting , the second to move the lever to ON, taking it from Disable to Enable.When you do this, you will see the Auto Power Sync setting appear on the screen, which is turned on automatically.With this setting you can control the devices connected via HDMI from the remote control: if you turn off the TV and you have a device connected via HDMI compatible and synchronized, it automatically turns off the device as well and vice versa.If you turn off the device, such as the DVD player, the TV also turns off.Not all devices are compatible, but the possibilities increase in case of LG products.Some TVs also have the HDMI ULTRA HD DEEP COLOR function (to have HDR) which can be activated by following the path Settings> General> Devices> HDMI Settings and, next to the HDMI ULTRA HD DEEP COLOR item, by moving the relative lever.Finally, you can change the name of the entrance and its icon.To do this, press the Input button on the remote control and, from the menu that appears, go to the All inputs option and press the OK button.At this point, in the screen you see, locate the HDMI 1/2/3 item and press the one you want to change.Then, moving with the directional arrows, press the Change icon button, to select another icon from those present, and on the Input Label item, to change its name using the on-screen keypad.Have you followed all the instructions but, in any case, the audio-video stream has problems or, directly, does not work?So first check that you have selected the right source and / or try to use another cable as the one you have is likely to be faulty.Alternatively, the port could be faulty, so you can try using another one.If that doesn't work, it could be a TV problem that requires expert assistance.In this case you can connect to the LG support web page, select the type of product (TV and Audio Video> TV) and, through the side menu, select the items Troubleshooting - Video or Troubleshooting - Audio, to check the more problems. common and methods to solve them.Alternatively, still via the support web page you can consult the manual of your TV through the Manuals and Documentation icon, request a home repair through your LG account or contact the assistance through the various channels offered.If you want to speak directly with an LG operator you can call 199 600 099, which takes care of assistance on all LG products except for smartphones, active from Monday to Friday, from 09:00 to 18:00 and on Saturdays. from 09:00 to 13:00.If you prefer an email contact you can use the dedicated form, fill in all the fields relating to the type of product and your personal data and, finally, type the request specifying the subject, providing a clear description of the problem and, if necessary, attaching files useful for solving the problem.The last method of communicating with LG assistance is to use the chat, reachable through this page of the official LG website.The live chat, directly with an operator, is available from Monday to Friday from 09:00 to 17:30, while the chat with virtual assistant is available every day, 24 hours a day.Salvatore Aranzulla is the most widely read blogger and IT popularizer in Italy.He is known for discovering vulnerabilities on Google and Microsoft sites.He collaborates with computer magazines and edited the technological column of the newspaper Il Messaggero.He is the founder of Aranzulla.it, one of the thirty most visited sites in Italy, in which he responds with simplicity to thousands of computer-related doubts.He has published for Mondadori and Mondadori Informatica.