Arshia

It may be a software glitch or firmware problem. Since you've tried most basic measures, I have to recommend a reset factory, but that is too harsh, first contact the support team and see what they have to offer.

Even if the eco and power-saving modes are turned off, the screen saver might activate based on other settings or inputs not being detected. you should first check your TV's screen saver settings to ensure it isn't set to activate too quickly. These settings are usually found in the "General" or "Picture" section of your menu. Also, verify that your TV is recognizing input signals properly; sometimes, if the TV doesn't sense an active input, it might default to a screen saver.