Question about Lowrance GPS

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I have a Lowrance LMS 320 GPS/Sonar and the screen does not light up. Power to the unit is there. Have tried soft and hard reset. Unit is 4-5 yrs old.

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  • Anonymous Mar 18, 2014

    Lowrance

  • Anonymous Mar 21, 2014

    Unit sat for 4 yrs previous owner had 2 neither screens show anything.

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Are saying you can't read the screen at night, or is it hard to read the screen anytime?

If you tap the power key, you should here a beep and the screen should get brighter. If you hear the beep and there is no light, then the internal light has failed.

If you can't read the screen in normal light conditions try viewing it under a bright light at various angles. You may notice that the screen is just barely visible. If this is the case you may be able to fix the problem by adjusting the contrast. Try tapping bthe power key and then tap the right or left side of the track pad. It may take several taps to see the results. If left or right doesn't work, try up or down.

Posted on Jul 21, 2008

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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:
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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.

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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.

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Turn the unit off.

At the same time press the Pages and Power button. Hold both down until you see the square box come up in the screen. You should have your factory settings again. May need to try a few times.
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