Electronics Repair Questions? Ask an Electronics Technician
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If the GPS is over a year old, warranty coverage would no longer apply, and repairs would be charged to you.
The flat-rate fee for Garmin to repair an Approach S4, would be $99.00.
That may not be a fee you would wish to pay; if so, I understand.
Here is the page with all information about servicing your Garmin Approach S4:
Does this provide the information you require?