Chosen Solution
Toshiba 55l7200u tv has flashing green light with Toshiba across center of screen. won’t power up. have done all the suggested solutions of unplugging and holding down the power button to no avail. That has worked in the past but it doesn’t now. its been an ongoing issue for awhile. Any more suggestions besides replacing it. thanks Chaz
@chazby Toshiba is even more paranoid then Apple and has their service manuals and schematics locked down tight. They protect those with an army of attorneys and black helicopters. So, we can not expect any help from them. At first and knowing of Toshibas history with issues like your TV has, it could be a Network issue. It may try to connect but is failing. So, always make sure that you are disconnected from any. Since you already checked the Firmware etc. the only other thing I would suggest at this time, is a new main board. There are no schematics which means we could not even tell you how to fix it. There might be some voltages printed on the power board connector to the main board and you can check those with a multimeter and see if they are correct. You can also post images with your QUESTION of those boards/wiring so we could at least try and assist you further Adding images to an existing question
