Re: LG 23EA53 black screen after one second, it works after 5 minutes, high pitched s

Hi, Rattlesnake!
Yesterday I have the same fail.
Change de external switching! In my case the output voltage drop down to 16 V when it is connected.
I use now a old notebook switching that it have outvoltage 18.5 V, and work very well.
I hope this help you.
Best regards!