Help library: Help library: [LG TV] Troubleshooting a Red or Black and White Screen

[LG TV] Troubleshooting a Red or Black and White Screen

Troubleshooting TVS/SOUNDBARS 08/14/2025

<div class="content-service-view">
<p class="info-desc">If you notice that the entire screen appears reddish when the TV is connected to the set-top box, it may be due to a poor HDMI cable connection.</p>

<h2 class="tit">Causes and Symptoms</h2>

<li>The connection to your set-top box is bad.</li>
</ul>

<h3 class="sub-tit">Have you checked the HDMI cable?</h3>
<p class="info-desc idt">➔ Try reconnecting the HDMI cable to the set-top box.</p>

<div class="tip-box">
<strong class="tip-tit">Reconnecting the HDMI cable to the set-top box</strong>

<div class="con-view">
Turn off the power of the TV and the set-top box, disconnect the HDMI cable on the back of the TV, and reconnect it.
</div>

<div class="con-view">
Also, remove the HDMI cable from the set-top box and reconnect it, if feasible.<br/>
Make sure that you use an HDMI cable version 2.0 or later.
</div>
</div>

<h3 class="sub-tit">Have you checked the HDMI cable using [Quick Help]?</h3>
<p class="info-desc idt">➔ Try using [HDMI Check] in [Quick Help] in the TV Settings to diagnose the condition of the HDMI cable.</p><p>The [Quick Help] feature allows you to check if the HDMI cable is faulty or not. (Only applies to products released in 2019 and later)</p>

<div class="tip-box">
<strong class="tip-tit">Running [Quick Help] in the Settings menu</strong>

<div class="con-view">Press and hold the [9] button on the TV remote for more than 1 second and select → [Check TV Status] → [Check RF/HDMI] → [Start Diagnosis] → [Learn More]</div>

<div class="con-view">
① Check Items
</div>

<div class="con-view">② Check TV Status</div>

<div class="con-view">③ Check RF/HDMI</div>

<div class="con-view">
④ Start Diagnosis
</div>

<div class="con-view">
⑤ Learn More
</div>

<div class="img-only">
<img alt="Select Status Diagnosis in rf/hdmi check" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=A4Dw3hq5NuS3Gqvnu82Sw&amp;portalId=P1"/>
</div>
<strong class="tip-tit">About HDMI cables (faulty cables)</strong>

<div class="con-view">
If there are any abnormalities discovered from the test, replace the HDMI cable with a genuine cable.<br/>
If the problem does not occur in the picture test, please contact the set-top service provider. (e.g., cable TV, Skylife, IPTV)
</div>
</div>

<h3 class="sub-tit">Does the screen appear black and white even after checking the HDMI </h3>
<p class="info-desc idt">➔ Go to [Settings] and start [Picture Test] to check if the picture works normally.</p>

<div class="tip-box">
<strong class="tip-tit">Running [Picture Test] in the Settings menu</strong>
<p><strong>webOS 5.0</strong></p>

<div class="con-view">
[2020 WebOS 5.0] Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=JvVGr53dw24BkzCg02cw&amp;portalId=P1"/>
button on the TV remote and select [All Settings] → [Support] → [Additional Settings] → [Picture Test].
</div>

<div class="con-view">
Turn on the TV and press the [Settings] button on your TV remote.<br/>
Select [All Settings] in the [Settings] menu.
</div>

<div class="con-view idt">
① Select [Support] and then ② [Additional Settings].
</div>

<div class="con-view">
Select [Additional Settings] and then ③ [Picture Test] menu.
</div>

<div class="con-view">
Perform [Picture Test] to check the screen condition.
</div>

<div class="img-only">
<img alt="Perform [Picture Test] to check the screen condition." src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=Oi2zcGBdPCGKXWsGerl5kA&amp;portalId=P1"/>
</div><br/>
<p><strong>[Prior to 2019] WebOS</strong></p>

<div class="con-view">
[2019 WebOS or before] Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=psjG2wBMQkPHIcNRkbak6w&amp;portalId=P1"/>
button on the TV remote and select [All Settings] → [Picture] → [Picture Test].
</div>

<div class="con-view">
Turn on the TV and press the [Settings] button on your TV remote.<br/>
Select [All Settings] in the [Settings] menu.
</div>

<div class="con-view idt">
① Select [Picture] and then ② [Picture Test].
</div>

<div class="con-view">
Perform [Picture Test] to check the screen condition.
</div>

<div class="img-only">
<img alt="Perform Picture Test to check the screen condition." src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=95uRNwRiNx3S3iXuNWLw&amp;portalId=P1"/>
</div>
</div>
<p>
If the image on the test screen appears okay, it indicates that the issue lies with the broadcast signal and not the TV itself.<br/>
If the problem does not occur in the picture test, please contact the set-top service provider. (e.g., cable TV, Skylife, IPTV)<br/>
If the problem persists in the picture test, please contact LG Electronics Service Center.
</p>

<div class="tip-box">
<strong class="tip-tit">Note</strong>
<p><strong>[Products released in 2020 or later] WebOS 5.0 or later</strong></p>

<div class="con-view">
There is an [Accessibility] function in your TV that can enable black and white display during TV operation.<br/>
If the [Grayscale] option is enabled in [Accessibility] in the TV Settings, disable it.
</div>

<div class="con-view">
Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=nEG4u2XxmpPkSAYKTfyiYg&amp;portalId=P1"/>
button on the TV remote and select [Accessibility] → [Grayscale] → [Off].
</div>

<div class="img-only">
<img alt="On/off selection screen in access" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=82F2H36YuWsaBevNoQcNmA&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>

</body>
</html>
	
</div>

*Required question

Article Feedback Article Feedback

1. Was this information helpful?*

Please fill out the required field.

YES NO

Need immediate help?

2. How would you improve the information?*

Please fill out the required field.

Characters left : /

Submit

Thank you for your feedback!

Help library

[LG TV] Troubleshooting a Red or Black and White Screen

Contact