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Dimming LCD monitors


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I have two Samsung 17" monitors used in my boat, at night time they are so bright I hardly can see anything but the screens. One of them is used as a chart plotter and second monitor as a radar screen. The challange here is to dim down the AC voltage out of the inverter pcb. I did not find schematics of these inverters, however I find the input connectors to be 0V, 12V and a on/off pin. I dont think there are any brightness adjust on this inverter.
If some of you have been playing with this before please give me a hand, maybe I should buy new inverters to make it work?

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