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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.
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
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.
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