Lowrance went dead today

I have a Gen3/12 inch unit and today while fishing I turned around and looked at it and the screen was black. First thing I thought was fuse popped but I was fixing to come home and thought I would check it then.
I have the same unit in the 9 inch version so when I got home I plugged it up to the same power cord as my 12 inch unit and it came right on and worked as it should so that told me it wasn’t a power issue.
I can’t get the 12 inch unit to do anything.If I could get it to boot up I would do a hard reset but it just seems to be dead and won’t do anything.
It’s out of warranty.
Any thoughts?

I could be wrong! but doesn't a 12" draw more amps than a 10"? if so check the battery, it could be getting weak.

Go ahead and try the hard reset, nothing to lose.

The 12 inch is wired straight to my cranking battery that cranks a 150 4 stroke so I don’t think it’s the battery.

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Originally Posted by speckfinder

Go ahead and try the hard reset, nothing to lose.

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Can’t get it to turn on so I can’t do a hard reset

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Originally Posted by striperking

Can’t get it to turn on so I can’t do a hard reset

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The reset itself turns it on, worth a shot. If it doesn't come on, ???

What was the voltage on the 9 with the screen brightness on max when you plugged it in the 12s spot? From many years of boat and ice fishing Lowrance's shut off at around 10.5 volts (volts pulled up on the screen) if the nine shows low age voltage with screen on bright,the 12 might not start. I'd check wire connections and the battery, my big motor will still start fine right before my Lowrance's shut off.

Are you sure it didn't get put into dark/night mode by accident? Plug it back in and power it up like normal. You won't be able to see it on, but give it normal time it takes to boot up. Once you've waited ample time press the power button quickly a few times. If it is in dark/night mode the screen should lighten back up. Hope this is your problem and it helps you out.

Unfortunately I think it’s dead. I have talked to a couple people about it including Lowrance and everybody has the same thoughts.I’m going to check voltage tomorrow. I know it’s not in dark/light mode because I was standing at the back of the boat (not touching it)looking at it while longlining and it was working fine and then just went black. I can’t even see the backlights behind the control buttons light up when I try to power it up.

Was hoping it was something simple. Sorry it didn't help you out.

Sent from my SM-S908U1 using Crappie.com Fishing mobile app

Voltage check ,before you give it to the morgue….
My 2 cents , sounds like a slight drop to me , hopefully that is all it is ….
If the mother board took a time out it is likely toast

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Originally Posted by striperking

Unfortunately I think it’s dead. I have talked to a couple people about it including Lowrance and everybody has the same thoughts.I’m going to check voltage tomorrow. I know it’s not in dark/light mode because I was standing at the back of the boat (not touching it)looking at it while longlining and it was working fine and then just went black. I can’t even see the backlights behind the control buttons light up when I try to power it up.

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Did you try the hard reset?

I’ve done everything.Voltage is perfect
Can’t do a hard reset because it won’t power up.
Tried to do one.
It acts like it don’t have any power going to it.
I’ve tried it at 2 different power stations and I checked power at both 12.45 volts
It’s got to be the mother board or something internal

There's a company that works on them (clearcast) I think it's named,you could call them and check on fixing it...If you decide not to fix it and it were mine I'd be taking it apart;) and looking for broken wires were the power comes in,and other places...some times there's used mother boards on eBay..
I had the GPS quite on a gen2 a few years ago took it apart and all that was wrong was the wire ribbon had came off it connection.

I took it apart after talking to Lowrance.Didn’t see any visible sign of anything wrong. I don’t have a way to check the motherboard but I suspect that’s the problem.
It’s still under the prorated warranty but IMO Lowrance made me a stupid offer of $50 diagnostic plus $1350.00 replacement fee and shipping with only a 6 month warranty.
Everybody has these head units on sale right now for around $1800 with full warranty because they are closing them out to introduce there new units for 2023

Did you check voltage at open end of wire that hooks to unit? Battery volts and unit volts way be way off sometimes.

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Originally Posted by darcie1

Did you check voltage at open end of wire that hooks to unit? Battery volts and unit volts way be way off sometimes.

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Checked both

Lookup Rudolph Electronic Repair also