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The Garmin Nuvi 255W is a GPS (Global Positioning System).

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plug on back defective

the plug, (socket) on back is faulty i think, because the cable wont plug in securely so gps keeps coming on and off, power.

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I had this same problem I removed the board and heated it to reflow the solder then reasembled and all was well. Heated it with a heat gun at the port and used heat dissipation tape around the port to protect everything else

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joe, if the cable is no longer properly fitting the usb port, you most likely will have to replace it. It is a standard 5 pin mini-USB connector. Use this guide to get to the board so you can solder a new connector to it.

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joe crwdns2934231:0crwdne2934231:0
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