To diagnose Macs circa 2012 with screen defects due to manufacturing by LG, use the `ioreg` command:<p><a href="https:&#x2F;&#x2F;github.com&#x2F;SixArm&#x2F;sixarm_unix_shell_scripts&#x2F;blob&#x2F;master&#x2F;macbook-pro-retina-screen-manufacturer" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;SixArm&#x2F;sixarm_unix_shell_scripts&#x2F;blob&#x2F;mas...</a><p><pre><code>    ioreg -lw0 | 
    grep \&quot;EDID\&quot; | 
    sed &quot;&#x2F;[^&lt;]*&lt;&#x2F;s&#x2F;&#x2F;&#x2F;&quot; | 
    xxd -p -r | 
    strings -6</code></pre>