Try a short HDMI cable. Use one like this: https://www.amazon.com/AmazonBasics-High-Speed-HDMI-Cable-Standard/dp/B014I8SIJY?th=1
I have no cure since this issue has dogged the PS for years. You find this happens on some but not all sets so it's the same issue to me. Sometimes a short cable clears it up.
I have a LG 37LF66 37in LCD TV and unfortunately I have an issue with it!
I play my Playstation 4 through it a lot, sometimes I can play it for hours and sometimes I can play it for 10 minutes and I'll have this issue.
Basically, I will be playing a game/watching something and the screen will start to flicker and eventually go off all together and it comes up with no signal.
I have tried HDMI 1 and HDMI 2 and the same thing happens.
I don't think it is my Playstation because I have used this on other TVs and not had the problem on those.
It doesn't happen whilst watching normal DTV either, it just seems to be the HDMI.
Has anyone else had this problem before? Please help if you can! It's very frustrating.
Thanks in advance.