I managed to disassemble it, remove the lamps and the damaged inverter plate. My original idea was to turn on parallel with the input of the external source, the 12V led strips that take the place of the lamps. I could turn on the strips, but I got a self-diagnostic message from the monitor, telling me it had no signal (obviously it was connected to a PC). I assumed that maybe the charge of the LED strips was quite large, leaving without the necessary current to the board to function properly, so I ended up placing two external sources with 12V outputs and 5 A and 4.5 current To the other (one for the board and one for the LEDs). But I want to try to turn on the backlight directly from the board. My question is: what pin of the connector that was going to the old inverter should I hang? What should I place there to not load the pin too much? A transistor? A buffer stage? I had thought of a fet, because of the high input impedance, or an integrated type ULN2803. In case of placing a fet, would the gate directly excite with that pin, would the source go to ground, and between 12V and the drain would it place the parallel of the LED strips?