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that is a master control board failiure, it is caused by having your TV on all the time, when the TV gets warm, you need to shut it off and let it cool down(that caused your problem) call sony and order a replacement part, it will take you about 20-40 minutes to install yourself.
In standby mode (red led on/after the led stops from blinking), press "Display", "5", Volume (-)", "Power on" on the remote control in sequence, self diagnostic screen will be display, let me know the what is on the screen to diagnose where the fault came from.
Many problems with this unit with the HV transformer (flyback) and also a regulator ic in the power supply. Sorry, nothing easy for this type of problem. You will need a tech to diag. and repair this problem.
You may have had a failure in the high voltage/ horizontal output circuit. Since the problem was at first intermittent, it sounds like
something was breaking down in the above circuits and finally completely failed.