Question about Lowrance LMS 332c Mapping Sonar/GPS Receiver

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I have a lowrance lms332c and the unit powered off , was able to restart.shortly after powered off again and now has nothing.checked fuse and fuse is ok.

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  • Anonymous Jul 30, 2008

    Same problem just happend to me. Unit turned off by itself. I turned it back on and then it shut off 5 sec later. Then I tried again, this time shut off in 2 sec. Then would not turn on anymore.

  • Clarke of LA Aug 12, 2008

    8-12-08 - I purchased on of these units a year or so ago. The first one when out in the same manner as described after about 4 months. I returned to Lowrance and they sent me another one. This past weekend the same thing happened again. I think possibly Lowrance possibly has a problem with this particular unit. I had an LMS240C and never had a problem with it but purchased a new boat and wanted an in-dash color one. Will return this unit to Lowrance as well.

    Clarke in Louisiana

  • bill in la Apr 07, 2009

    I'm on my second unit as well. The thing shuts down when it gets warm. I found it goes down quicker in the sun, but since I don't fish at night, the unit is worthless. My replacement unit has died with the same problem as the first. Lowrance should recall all of these things since they are unreliable.



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Try to hold in the page button and power button at the same time to reboot your unit, But you may or may not lose waypoints,

Posted on Aug 12, 2008


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1 Answer

Why won't it turn on?

get a can of contact cleaner and disconnect all wiring one at a time and spray them down as you go along . stuff on boats do not like corrosion of any kind .

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Fuse Blows

does the unit works at all?

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Lowrance LCX power up problem

On Lowrance LCX-19 and I would assume other LCX series units.
The T3 Transformer shorts out and when the sonar kicks in it causes the unit to go over current and will eather cause the unit to reset and start again or blow the fuse. If you have the ability you can re-wind the transformer.

The primary is 46 turns of 24awg inverter duty magnet wire,
The secondary is 164 turns of 26awg inverter duty magnet wire.

Be sure to keep the same winding direction as what you take off as it may be phase sensitive. Be sure to use mylar tape between the primary and secondary windings.

Just a note this board has very heavy power planes and is very hard to solder/de-solder on.

If you have any questions or need help you can contact me at

on Jul 20, 2010 | Lowrance LCX-19C GPS Receiver

1 Answer

How do you reset the lms334c?

Hi, continually hold down the zoom in and zoom out buttons while you turn the unit on, keep holding them down until the screen fully loads. Regards Phil.

Jul 07, 2012 | Lowrance Lms332c Lms334c (Lowrance)

1 Answer

Our unit will not power up

Hi urcvrdha,

You have an elaborate unit! I like these. Your problem sounds more electrical than software related. Try taking all power off the unit for about 30 minutes, then powering up again. Of course, check your fuses. If you get the unit back up to the main menu, and things are not working properly, go to the various "reset" options in your manual for that mode of operation.

If it does not succeed in getting power, I recommend contacting your local Marine/Lorrance dealer for service.

If you don't have your manual handy, download one here:

I hope this adds a little information to your problem search. Thanks.

Regards, Bill

Sep 16, 2010 | Lowrance LMS-332C GPS Receiver

1 Answer

I have a lowrance LMS 332C GPS. After 5 years I

The LGC-2000 is bad would be the most likely cause, but if this started right after you changed the cables, Try connecting the NMEA 2000 network to a different power source than the main power. If you still have the original cables, and you didn't have the problem before, try using those again to make sure there isn't anything wrong with any of the new cables.

But most likely, the LGC-2000 is toast and you will want to contact Lowrance support to see about getting it repaired/replaced.

Jul 04, 2009 | Lowrance LMS-332C GPS Receiver

1 Answer

Unit will not power up

I too have lowrance unit which is the reverse. it is powering up by itself as opposed to not powering up,despite checking fuses/lines which are ok. If you are lucky enough to be under warranty, take it back. If unlucky, you too, like me have paid big bux for something that has perhaps lasted only a few years and should last a lot more, given what you perhaps paid for it.
Technical expert advise is that initially the unit will power up by itself but now has progressed to not powering up.You may have a problem with the keypad failing. the bubble type press pad. The wiring shorts and the unit jumps voltage across the keyboard which "tricks" the unit into thinking that you have pressed the power key. After a period of time the unit problem will just progress to not powering up at all. basically the unit has ulitmately failed with time. Short of perhaps definitely stating the unit hasnt been hit or dropped, i suggest if you are in Oz, contact lowrance service in Sydney who are happy to help. they have a possible solution whereby you send in the unit, and they check it.
Generally if not deemed repairable they will replace it with a new similar unit. the only catch is you are up for X (few hundred dollars). this might seem a bitter pill, but you are only charged about a third or half of what a new replacement unit would cost. they give you an updated current model similar to what you have. Im prepared to take that option as it is a cheaper alternative to starting again and paying top dollar. Ive never experienced a power up/down and short of yelling at my son thinking he was playing with the unit, i will have to eat pie and realise with these sort of temperamental gadgets they can fail in the un normal way. Hope it helps. Kahuna 430

Apr 21, 2009 | Lowrance Lcx 28c Hd 7" Gps Fish Finder...

1 Answer

Keeps blowing fuses

It has a short in the wiring which is "not user fixable". I think the wires are crossed. Take it back, they need to repair or replace it. I suggest you replace it. Take the GPS with you show you can show them the problem. If you bought this on line call Lowrance and find the nearest repair center. Repair it yourself and you loose the warentee.

Aug 21, 2007 | Lowrance LMS-480MDF GPS Receiver

2 Answers

Powerin up - screen goes blank after a few swconds -

had same problem. the cause was corrosion in the boat wiring. the power wire was corroded 95%thru. there was enough voltage to start the unit but when the sounder kicks in the voltage dropped below minimum and the unit shut off. took a LOOOONG time to find.

Nov 15, 2006 | Lowrance LCX-19C GPS Receiver

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