I don't believe those hours that the manufacturer says it has to withstand the OLED panel. There are many allegations in the network that wear begins almost immediately after the first month, but becomes visible after 1-2 years. I'm not an expert, but in my experience it probably is.
The warranty expired a few months ago (at the end of last year) In addition, there is no damage, except for the dark picture, which was dark from the beginning, not as now, but still dark. I know that I can hardly prove such damage, I also know that in such cases they usually say that the cause is improper operation. Therefore, I do not think to wasting my time and nerves looking for warranty service.
I am interested in the A90J because now in my country, there is a very good offer, probably because of the upcoming premiere of the new models. But if, even with this top Sony model, it is likely to lose some of its qualities in two years, it will be too disappointing for me.