Question about Northstar Explorer 657 Gps/Chartplotter/Sounder Combo With Tm Transducer

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I Have a 657 northstar the depth comes up and works then it just stops with no reading at all it was comeing up with low power so put new battries in it has 13.8 volts and still doing the same thing Regards Scott

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I had the same problem with my 657 I found it was moisture inside the unit that was causing the low voltage alarm to go off pull it apart and let it dry out inside

Posted on Sep 09, 2011


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Posted on Jan 02, 2017


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1 Answer

I cannot get a gps fix on my north star explorer 657.used to work okay .

replace the gps receiver if its external if internal good luck

Aug 26, 2013 | Northstar Explorer 657...

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Colour codes of output data cable explorer 650

From the owners manual (page 78, link below) NMEA out (+) is the white wire and NMEA (-) or ground is the black wire.


May 14, 2012 | Northstar POWER/DATA CABLE FOR EXPLORER...

1 Answer

Northstar Explorer 657 GPS/ Fishfinder Screen went black

It appears that the back-light, a Cold Cathode Fluorescent Tube about 3mm diameter, is not working.
There are two likely causes.
1. Tube has failed.
2. High Voltage supply circuit has failed.

I'm currently pulling my unit apart to determine the cause. I suspect the tube is the problem but I will post more when I have it apart

Does anyone know what the correct operating voltage of this Cold Cathode Fluorescent Tube is? Northstar could not provide me with a service manual.

The screws are 1/16" or similar Allan Screws (about 1.6mm internal between flats). They usually can be undone with a 1/16 Allan Key but some of the screws can't be unscrewed with this key.

I'm having difficulties uploading the photos at the moment but I will try and fix that.

Jul 31, 2011 | Northstar Explorer 657...

1 Answer

I need a new scren wer can i get one


I'm afraid your best bet here would be to contact the manufacturer directly. Here's the customer contact page:

Hope is is helpful to you and good luck!

Sep 09, 2010 | Northstar Explorer 657...

2 Answers

Black screen

If it is connected to the boat motor check the voltage that is coming from the engine and clean the battery post. This solved the screen flickering.

If you don't want to do that just call Northstar customer support and see what they suggest.
Phone (Toll-free) 1-800-628-4487 or (Direct) 603-324-2042
That will get you better support.

Jun 09, 2010 | Northstar Explorer 657...

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