What changed from when it worked until now when it doesn't? Has anyone worked on any wiring? Most of those cameras are electrically connected to the third clearance light on the rear of the trailer. If that's true, then the only way for the camera to be energized by the brake light would be a fault in the wiring. If both of these are true, then when you apply the brakes the clearance lights would come on. To test this interaction I would suggest a simple procedure, place the tow vehicle in park with the lights off. Turn on the 4 way hazards as that will flash the brake light circuit. If the monitor goes on and off with the hazards then there's a serious wiring issue. If it doesn't coincide with that then pull the emergency breakaway pin on the trailer. If the camera works then someone wired it into the break circuit. The above is dependent on the camera being the issue, not the monitor. I don't own that brand but all the monitors that I've seen are like modern LCD televisions. If the signal drops out the screen turns blue and a "no signal" or "signal lost" text will appear on the screen. If the screen goes dark then power is lost to the monitor not the device connected to it.
Hope this helps.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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