My lms 332c wont stay on tried soft reset turn it on goes off what to do?

Lowrance LMS 332C Installation And Operation Instructions Manual

Hello
I don't know whether you have made a factory reset to this device or not. If not, set it first and see whether it helps you. To make it factory settings:
[1] Press 'MENU""MENU" (down arrow to system setup) "ENT" (down arrow to RESET options/ ENT
[2] The unit asks if you want to reset all the options. Press [<---] to YES and then ENT. All options are reset, and the unit reverts back to map page at 4000 miles zoom range. Any recorded sonar logs of GPS data will be unchanged. OK.

Say to god

Here's my LMS 332c circuit board. I'm showing where the power source is on the lower right, and where I believe the first two ribbon cables that lead to the power switch on the front panel (upper left). Can anyone tell me how to disable the internal power switch and where? I want to install external switch and bypass the internal. I can solder and not afraid to try since this unit is out of warranty and is not functional as is with powering on/off and screen flashing randomly. Thanks!

Try setting up the speed in the overlay data menu again:
1. Press MENU, arrow down to OVERLAY DATA and press ENT
2. Highlight the option for speed (WATER SPEED or GROUND SPEED) and press ENT
3. Highlight the REMOVE button and press ENT
4. Highlight (PRESS ENT TO ADD) and press ENT
5. Arrow down to SONAR DATA and press ENT
6. Arrow down to WATER SPEED and press ENT, a check will be displayed in the box
7. Press EXIT twice

If the speed is still flashing, the data is still invalid. Try resetting the unit completely:
1. Turn unit off
2. Press and hold the PAGES and POWER key until the "DO NOT RELY..." alarm appears
3. Set up the overlay data for speed again: 1. Press MENU, arrow down to OVERLAY DATA and press ENT; 2. Highlight (PRESS ENT TO ADD) and press ENT; 3. Arrow down to SONAR DATA and press ENT; 4. Arrow down to WATER SPEED and press ENT, a check will be displayed in the box; 5. Press EXIT twice

If the speed is still flashing, good chance the speed sensor is bad even though the wheel still spins. Install the latest LMS-332 updates from http://www.lowrance.com/en/Products/Marine/Full-Size-SonarGPS-Chartplotter-Combos/LMS-332C/Downloads/LMS-332C-Software-Update/ and set up the overlay data again.

If it turns out that the speed sensor is bad, just use speed from the GPS. This can be set up from the overlay data menu as GROUND SPEED.

(note: the overlay data must be set up for each page individually. So if you set up speed to be displayed on the map screen, it will not also be set up on the sonar page)

I have this problem as well! Mine is on the LMS 332C

I am guessing that the card you are using is a NAVIONICS chart? There have been some Lowrance units that were made around the same time that have had problems recognizing a Navionics chart right from power up.

Make sure the LMS-332 has the latest firmware version which can be downloaded from http://www.lowrance.com/en/Products/Marine/Full-Size-SonarGPS-Chartplotter-Combos/LMS-332C/Downloads/LMS-332C-Software-Update/

If the update doesn't help, this is going to be a compatibility problem with the LMS-332 and that particular card. You will need to replace the card or upgrade to a newer unit...but probably can just get used to removing and replacing the card when you turn the unit on.

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.

Here you can buy the DVD for $13:
Bennett Training DVD For Lowrance LMS-332C
Here is the user manual:
LMS-332C and LMS-337C DF Owners Manual
Do not forget to rate the solution appropriately.

Many thanks.