Chosen Solution
The issue start with horizontal lines on the right side of the screen and after a few off/on and reset, there is nothing, no sound or picture. I opened the back of the tv and notice the main board would reboot every 90s or so. Even with all cables disconnected (except for power signal and the one to power supply), it reboots every 90s. Is this an indication of a bad board or it reboots because of no load? When things are connected, it reboots because of other things cause it to reboot? Here is some voltage measurement on the connectors CN201 pin 1, 5-7, 10-15: 0V pin 2: 3.81V pin 3: 5.11V pin 4, 8, 9: 12.66V CN301 pin 1,2, 9-14: 0V pin 3-8: 24V CN203 pin 1-7: 0V
Tri LE it’s a bit confusing. The pin you are talking about would be on CN201 pin #3 which turns the power supply on. If it gets signal but does not turn on it is most likely a bad power supply. Check the other voltages on CN201 and CN301 and let us know what you got. It will also help if you post some pictures of your boars and point out where you measure and which LED is blinking. It is possible that it just shows that it is sending a signal/trying to connect etc. Both main and power board for this model are pretty much unavailable at the common places. That tell me that there are some issues with those boards. You can get repair kits for both boards to replace the most commonly failed components. you may need to consider something like that.
