Help Library: Help Library: [LG TV screen] The screen keeps blinking and going black when I watch cable TV

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<div class="content-service-view">
        <p class="info-desc">
            You may experience screen abnormalities if the antenna is damaged or the connection is weak.<br>
            If the broadcast signal is unstable, the screen of some channels may flash or not show anything.
        </p>        
<h2 class="tit">Causes and symptoms</h2>
        
<ul class="cause-list">
            
<li>The screen flashes while watching shows on cable or public-access television.</li>
            
<li>I can't see the screen while watching TV on cable/public-access television, and it shows me the "No Signal" message.</li>
            
<li>Some channels flicker or don’t show anything when I am watching cable/public-access television.</li>
        </ul>
        
<h2 class="tit">Try this</h2>
        
<h3 class="sub-tit">Please check the antenna connection status.</h3>
        <p class="info-desc idt">➔ You may experience screen abnormalities if the antenna is damaged or the connection is weak.</p>        
<div class="img-only">
            <img alt="Image to check the antenna connection status on the back of the TV" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=1RBoDoLz3VEh7R3BljKRA&amp;portalId=P1">
        </div>
        
<div class="tip-box">
            <strong class="tip-tit">How to check the signal strength and quality with TV menu</strong>
            
<ul class="bul-list">
                
<li>
                    <strong>[2022 WebOS22], [2021 WebOS 6.0]</strong>
                    Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=Zg8LiXwx6VET6EvtPd61w&amp;portalId=P1"> button on the remote control and select [All Settings] → [General] → [Channels] → [Channel Tuning] → [Manual Channel] → [Cable DTV].
                </li>
                
<li>
                    <strong>[2020 WebOS 5.0 or before]</strong>
                    Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=RYsP5ewBsYY96RZftQvHQ&amp;portalId=P1"> button on the remote control and select [All Settings] → [Channels] → [Channel Tuning] → [Manual Channel] → [Cable TV].
                </li>
            </ul>
            <p><strong>[2022 WebOS22], [2021 WebOS6.0]</strong></p>            
<div class="con-view txt-idt">
                1. Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=bertzQymBuX2dbvjV8hYA&amp;portalId=P1"> button on the remote and select [All Settings].
            </div>
            
<div class="img-only">
                <img alt="Image that enters all settings by pressing the setting button on the remote control" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=yKZVuozV71mtAtZxvC0Qg&amp;portalId=P1">
            </div>
            
<div class="con-view txt-idt">
                2. Select [General] → [Channels].
            </div>
            
<div class="img-only">
                <img alt="selecting Channel Tuning from the General Menu" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=gdNk6WYEfQm2CFoy6aFGVQ&amp;portalId=P1">
            </div>
            
<div class="con-view txt-idt">
                3. Select [Channel Tuning] → [Manual Channel].
            </div>
            
<div class="img-only">
                <img alt="selecting manual tuning among channel tuning" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=wLAqMnnNfqxFQkZBt3YbQ&amp;portalId=P1">
            </div>
            
<div class="con-view txt-idt">
                4. If you’re watching cable, select [Cable DTV].
            </div>
            
<div class="img-only">
                <img alt="choosing cable DTV" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=pUsKSDQKTdiIsB0KS2zfCQ&amp;portalId=P1">
            </div>
            
<div class="con-view txt-idt">
                5. You can see the signal strength and quality of the channel being viewed.
            </div>
            <p><strong>[2020 WebOS 5.0 ] or before</strong></p>            
<div class="con-view txt-idt">
                1. Turn on the TV and press the [Settings] button on the remote control to select [All Settings].
            </div>
            
<div class="img-only">
                <img alt="Image that enters all settings by pressing the setting button on the remote control" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=r3imbeOwrEbwegodYVIw&amp;portalId=P1">
            </div>
            
<div class="con-view txt-idt">
                2. Select [Channels] → [Channel Tuning] → [Manual Channel] → [Cable TV]. (Select when using a cable TV)
            </div>
            
<div class="img-only">
                <img alt="selecting channel tuning in the channel menu" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=yZGAURzcDGN0be7uBIM36A&amp;portalId=P1"><br>
                <img alt="selecting cable TV during manual tuning" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=9DHe0KUo6dOtw5a652dg&amp;portalId=P1">
            </div>
            
<div class="con-view txt-idt">
                3. You can see the signal strength and quality of the channel being viewed.
            </div>
            
<div class="img-only">
                <img alt="An image that confirms the strength and quality of the TV you are watching" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=qTQ2I4GLS3ywaZpR8rsxzQ&amp;portalId=P1">
            </div>
        </div>
        <p class="help-txt">This guide was created for all models, so the images or content may be different from your product.</p>    </div>

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[LG TV screen] The screen keeps blinking and going black when I watch cable TV

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