Thanks for stopping by.
4 Flash error indicates an issue with the fan and/or power supply.
90% of the time - the fan is to blame. Check to see if it is working - or clogged with debris. Check the filter too - as if it is dirty, may have lead to the fan's failure.
If the fan does not report properly - the PSB will shut down to prevent damage to the lamp.
These TV’s are completely different, you have a fan error. One of your fans either are not spinning at all or one of them is slow. I would order both fans, they are cheap.
Even if you fix the problem by cleaning the fan, I have found that the fan will eventually fail, so replacement is easy and more permanent.
There is a "squirrel cage" behind the large rear fan, behind the lamp power supply. Check it - give it a bump or wiggle to see if the fan is locked up.
Use some compressed air and blow out all the fans really good, and you may get a little more life out of them.
If you require further - Just Ask.