Good morning I bought a used samsung smart tv model UN40ES7500 but in "good condition", all its functions work perfect just like all usb, ethernet and hdmi ports. Your problem lies on the screen. that stops working half or completely but still listening. That failure can go weeks without the present as it may be that the unexpected present and you have to turn off or turn on the TV to remove it or leave it off for a while. I hope you can tell me what the problem is and if you have any solution thank you PD: Annex photos of the error.