Question about Navman F20 GPS Receiver

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Have a navman F20 satnav which was low on charge. When plugged into mains initially showed battery charging in black and white then blank screen so left it charging for 24 hours. When switched on again straight away showed full battery with X on terminal then blank screen. will not now switch on. Any ideas?

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  • Teresa Lomax Jul 14, 2018

    Nothing is happening won't switch on

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If its showing a white battery with a cross then its not charging. Try using the car charger and see if it shows a battery without the cross.

Posted on May 03, 2010

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Hi it won't turn on and I don't no why it's on charge at mo but we don't no if it's charging as before it came on and then went dead is there anyway you can help please Newman f20

Posted on Jul 14, 2018

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Posted on Jan 02, 2017

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When i turn my satnav on open page comes on and then it showes a picture of satnav charging from a laptop and will not go to anything else can u help me please thanks graham


Hi Graham,I had exactly the same problem with my Nav Man S50. After the icon of the lap top my screen went blank. I updated it via the soft ware provided but no updates were available. In fact the problem turned out to be the on/off switch. Although it was glowing red it was not charging. I simply placed a pen into the switch and it worked.
Hope this will help.
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How do I charge my garmin 1300 gps


You can charge it using the car charger that came with it by plugging it into the cigarette lighter socket of your car and the narrow end into the back of the satnav. You need to have power going to the cigarette lighter socket. On some cars that means that the car has to be running. There's a little led (light) on the plug which shows when it's receiving power. Charging this way takes about 4 hours.

You can also charge the satnav using an optional mains charger which also takes 4 hours.

Finally you can charge it by connecting it to the USB port of a computer for 8 hours. Both the computer and the satnav need to be on.

There's a battery state indicator on the screen of the satnav which shows if the battery is charged or not, on the screen which shows WHERE TO and VIEW MAP. It only shows when the satnav is not connected to a power source so you need to stop charging it to view it.

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screen shows computer to navman all the time

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Manuals are available from download on the Navman Wedsite. (Google Navman)

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Probably the plug on the navman has suffered what we call dry solder joints from inserting and pulling out the charger you need a tech to fix it. soldering is nesessary shouldnt be too expensive I fixed mine its about half an hours work if not too damaged inside

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No solution but exactly the same model and exactly the same problem. When I put the car charger on the unit, it goes off and then comes back on and ust shows a computer as though the only option it can handle via usb is a computer connection. Interestingly, it still charges, but just becomes useless as a satnav as there are no maps, directions or any scree functionality at all.

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1 Answer

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The problem is that most of the chargers have the output of 5V/0.5A. The charger for NAVMAN (C30 in my case) has 5V/1A. And that is causing the trouble. The GPS is undercharged and is switching off itself. Buy one which specify the output power: 5V/1A. Hope I solved your problem

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