The TV turns on the lamps for 15 seconds, lamps go off for 10 seconds and on again and stay on. The logo light stays on, do not blink or change. Voltages coming out of the Power supply board are all checked, there is noticeable variation to the posted voltages on the board. The screen remains black all the time. I disconnected the t-con to see if that makes a difference but not change at all. I connected a video player and nothing changed, there is no sound coming out of it. Power bottom works, I used a flashlight to see if there was a menu hidden on the dark screen and nothing. How can I know if the logic board is broken for sure, since the power bottom works and the lamps too. Thanks for your help and I am not doing my posts right, please correct me.
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I bought some stuff to try to repair it and learn as many things as possible about computer repairs but nothing worked so far. When the black screen appeared, my legion 5 pro was connected to my external monitor...
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