I run a hds 9 gen 2 and gen 3 12 at console with a 7 and 9 gen 2 up front. Was fishing today and the 9 on the console went dark. For some reason I flipped the accessory power off. When i flipped it on and turned on the units, all 4 will power up, show the hds lowrance logo brightly, then show it dimly, then go dark. Not as dark as when they power off but dark. My sonic hub runs though the 9 on the console and still plays music when its on, but no picture on any screen. All 4 are running off my cranking battery, and it fires right up. Even when my cranking battery hadn't had enough power to start the engine, they still ran (story for another time). Anyone experience similar issues or have heard of it? Thanks

I’m guessing, but if nobody else responds then it’s a Hail Mary. I believe you can control all the screens brightness through nmea, you might have the one graph glitching the others. Maybe leave it off and see if the others power & run at full brightness.

Turned the accessory power off? ...meaning you just cut power to all 4 units while they are running? That is absolutely asking for trouble. Read the manual; they are computers with an operating system that should always be shut down in an orderly fashion using the "power off" command.

Did they end up at low brightness level? I believe you can step through levels of brightness with short presses of the power button after giving the unit time to boot. Check your manual for that. There's no telling what you did with the loss of power.

To test if anything on the network is causing it, remove all cables from a unit except the power cable, then power it up. If it's dim, check the brightness level per above.

Thanks flippin out. It was that dang brightness level just turned down all the way. Up amd running again. Owe ya a cold one. Thanks yall

It got me too. Years ago, I had one power up like that when I first went out. I ended up with a raincoat draped over me to see the screen to see how to find the settings. THAT is why I now remember the short-cut of short-pressing the power button - a fact I didn't know at that time.