Hello there and welcome to Just Answer. My name is ***** ***** I will be assisting you today. I am an engineer with over 30 years of electrical and electronic training, repair and installation experience. I will try and answer your question accurately and precisely so that we can get you on your way.
If you purchased the Garmin last March then it is still under warranty. You will need to send the unit to Garmin and they will repair/replace and send it back to you.This is initiated online from THIS PAGE.Please go to that page, follow the instructions and let me know if you have any questions.I'll be here.
For out of warranty repairs, Garmin charges a flat rate of $130 (US) for a Dezl 770.You would initiate the repair online by clicking HERE and following the prompts.Please let me know if you have any questions.Steve