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Garmin GPSMAP 740s

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Worked fine in fall now it will not turn on, so I either need to fix it or replace it

1)where would you take it for repair 

2)what would you replace it with 

yes there is power to the unit 

yes I have checked the connection no corrosion 

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  • 2 weeks later...
On 6/2/2023 at 5:20 PM, Quonnie said:

Yes I checked and replaced fuses

i will try the 30 second reset next

Looking to replace this unit

i am going to stick with Garmin and would like to use the cables and transducer I already have it is a 19 pin cable, rerunning cables is a pain 

any suggestions for a replacement 

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13 hours ago, RedSoxTicket said:

There is a coin cell battery in the unit that could be dead, measure with a voltmeter and replace it needed.

I will look today but when I called Garmin they said there was no battery 

but I will look today 

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2 mins ago, Quonnie said:

Found it

tiny tiny battery 


If you DIY, get soldering iron to hot temperature prior to soldering the wire to the battery so that minimum time is needed in order to prevent the battery popping to over heat.

Also use some type of adhesive like glue gun to adhere the battery in place

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