Sorry to hear you are having difficulties but I am here to help. Keep in mind the answers I give depend entirely on the responses you give in return. So please be insightful and patient and maybe together we can solve your problem. Realizing the answers may not be pleasant for you to hear but you are requesting my expertise and I hope you will honor your good faith promise.
Are you using an HDMI cable?
Please tell me how your signal is coming to your tv. Is it a converter? Is it coming directly into the tv? Is it terrestrial? Remember my answers can only be as effective as the question is posed.
It is apparent now that you have a television problem. Could be explained by the inverters not able to continue to provide enough energy to keep the display illuminated or it could be the display itself telling the system control to shut the set down because it is malfunctioning. Inverters can be observed they are the boards to the left and right of the display and are attaching to the backlight connectors, but if the problem is the display it usually becomes cost prohibitive. Thank you for allowing me to answer your question. Please accept as this is how I get paid and consider leaving positive feedback. Do not hesitate to ask if you are in need of further assistance.
You will note in my previous answers I was not blaming the initial power supply system. What I just described to you is the inverter power supply system.
Without getting very lengthy with the processes it takes to illuminate the display on your product. Let me just say that the inverter power supplies must be operational to provide current and excitation voltage for the backlight portion of the display. They can actually illuminate the display but when not able to provide enough current flow will de-illuminate the display intermittently and it can even be a result of the display itself momentarily failing and the main signal board shutting the set down. Without specific voltage checks and a proficient knowledge of DVM techniques I am just giving you what is possible. Fiddling with a remote control however long did not technically address the resolve.
The next procedure requires you to take the back off and take some voltage measurements when the set fails. If you do not have the tools and are not proficient with a DVM I would suggest taking it to a professional servicer for diagnosis.