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I'd suggest calling Lowrance.. Those guys are very helpful with step by step support... I just purchased a used boat with a 525c df on it and been troubleshooting some problems with it. Central time zone and best to call right when they open or turn on the phones at 8:15.
Hope its not to late, before you replace (buy a new one) call Lowrance. I have a 525 and working through some problems and they advised me that they would replace my unit for $200 no questions asked. To answer your question not 100% positive but I did see a recent question where Lowrance lost his unit and sent him the 525 as a replacement and the connections were different. I believe my 525 has a 5 pin system with one notch. Does yours have a external gps module? The 525 does!
This may or may not offer help but on the lowrance site it has very simple step by step instruction to solving this problem. The first step is to make sure your getting power to the new 4000 series. With a 12v tester you can do this. On the gps unit there is 3 different power sources. One is main power, two is sonar and three is power to data. One you have power going to the 4000 then proceed to other options. I hope you didnt pay full price for your 4000. Lowrance has a replacement process and replaced my 2000 for a 4000 for $120 (2 day shipping). Back to your situation... Out the back of the data will the a cord that connects into the bottom of the T, and the a resistor on one side and the 4000 on the other side.
Make sure that you have powered the NMEA 2000 network. The display
unit's power cable has a set of red, black, and sheild wires that need
to be hooked up to a 12VDC power source. There is a power diagram
somewhere in the manual that should show this.
Make sure that
you have the NMEA 2000 network connected properly. If it is a newer
version LMS-525, it should just be a single 15ft cable that has two female
ends, the module plugs into one end, and the other end plugs into the
back of the display. If it came with some T connecters and 120Ohm
Terminator caps, then make sure you have that hooked up correctly.
There should be a diagram in the manual for that as well but you just
connect the two T's together like TT, put the 120Ohm terminators at
each end, and run the extensions to the display and GPS module.
is a decent troubleshooting guide for checking to make sure power is
getting to the module at
If this doesn't tell you anything, most likely the GPS module is bad.You will need to contact Lowrance support to get it repaired/replaced. You can call them at 800-324-1356 or email them at http://www.lowrance.com/en/Support/Product-Support/Contact/
Does the image come back by itself if you slow down or stop and wait? If not, make sure you are not leaving the coverage area of the chart you are set to. In the LCX-20, that Navionics chart is split up into several sections, if you have one section selected and are on the border and then leave that area, the map usually goes all white depending on your zoom level. If you are on a border like that you will have to learn to quickly switch the charts from the MAP DATA menu.
If the map does catch up when you slow or stop, and just can't redraw fast enough...
Make sure the LCX-20 has the latest updates which can be downloaded
from http://www.lowrance.com/en/Downloads/Product-Software-Updates/ These updates often add additional Navionics support.
Most likely though, this is just going to be the way it is with that particular map and the LCX-20. If you zoom out it will be much much better. So if updating doesn't help, zoom out. Experiment to see how close you can be zoomed in while running above 20mph. If you can get a good zoom level to where the map can keep up and you can still see the information you need then you should be good to go. If not, use the LakeMaster card or go get a different mapping option...or upgrade your display unit.
I had the same problem with my handheld Lowrance Hunt C. After
installing the card and locking it in place, I had to slide the card
"out" toward the locking mechanism. It barely moves, but worked after
that. Whenever I load the card, I now slide it out or wiggle it and it works every
I had the same problem with my handheld Lowrance Hunt C. After installing the card and locking it in place, I had to slide the card "out" toward the locking mechanism. It barely moves, but worked after that. Whenever I load the card, I now slide it out and it works every time.
All of my lowrance products ar very particular to cards. Both my I-finder and my X-15MT would not read cards that other readers would read. I finally have three cards that work and guard them very carefully. PS. I found this via Lowrance troubleshooting and received great help from a tech there. You can check the cards before registering them by placing them in your unit and see if it shows the card present.