External HDTV not working after 10.13.6 update

zamerini wrote:

The build number is 17G6030

You have the most up to date build for your model.

You can Try a SafeBoot in an effort to clear cache https://support.apple.com/en-us/HT201262

  Takes noticeable longer to get to the login screen, does a 5-10 minute disk repair before it fully boots up, and certain system caches, dynamic loader cache,  etc.  get cleared and rebuilt. 

With your same Apple ID you can sign up for a free Developers Account and start a conversation with Apple engineers

by filing a Bug Report: https://bugreport.apple.com/

You can try and fall back with a Time Machine backup and restore your machine to regain connectivity.

How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250

zamerini wrote:

It looks like the same question as the topic

https://discussions.apple.com/thread/8466498

but with my macbook pro 2011, none of the proposed solutions worked.

the "infamous" update 10.13.6 I can't connect the mac to the TV.

I tried to connect it to a VGA monitor with the adapter and it works, but with the TV nothing to do. It doesn't detect it at all.

Has anyone encountered the same problem with HDTV?

Was this the update to the update? build number  17G6030.

About the security content of Security Update 2019-002 High Sierra

https://support.apple.com/en-us/HT209635

The screen shot was only an example—no one said you had the beta.

If you click on the Version it will show the build number—this is what we are after.

zamerini wrote:

The cache flush seems to have worked.

Thank you

Good computing zamerini ! Thanks for your report, much appreciated.