Chosen Solution
When I perform a factory reset of the TV (by continuously pressing UP key on the remote and power button on the TV once), the TV operates normally for around 12-15 minutes. Then the display turns off and red light on the TV blinks 6 times (which I found out stands for backlight error). There are no areas on the display that seem dimly lit when the TV is operational. I tried disconnecting and re-connecting all the cables from the different boards just in case it was an issue of a bad connection somewhere. No help from that. Resetting only solves the problem temporarily. This is what the self-check shows:
Even if the led strips light up, I noticed the Sony bravia from recent 2017 and up ha e some sort of check feature on the main board. It searches for correct voltage in the led strip and if the voltage is off higher or lower it shuts down, you need to change the led strip this will solve you problem but first you should buy the power supply tcon and mainboard first, If that doesn’t solve the issue you should replace the led strips those led strips are always going bad. Additionally please buy your boards from shopjimmy.com not ebay. Ebay boards cant be trusted the sellers are not pros they will sell a board without knowing if it works or not or if you will buy a board from eBay buy a board from a power seller with 100% feedback.
Since the back light works for a period of time, we can assume that the LED strips are working. I would look at the power supply or the LED driver area for a problem. This could be as simple as a poor connection that fails once it heats up or a component failure. Without access to the TV and some testing with meters etc, this will be tricky to locate. Both the Tcon and back light errors can arise from power problems. I would start there. Post a photo of the boards. Perhaps something can be seen. Keep us posted on progress. Dan
Sometimes you can bypass the issue by disconnecting and grounding the backlight error wire.
