Attached from a battery (4 x AA NiMH - it would be nice to add a 5V regulator) a standard USB power/data cable causes the GARMIN NUVI 205W GPS to go into USB MASS STORAGE MODE (for data transfer) just as if it was attached to a computer. The commercial car charger through the same mini-usb port allows the unit to work in navigate mode. How can I modify the cable so that the NUVI sees it as power only?
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The Garmin will automatically go into 'PC connect' mode when a standard 5v 500 ma charger is connected. This is the same as a PC or laptop. To get the unit to function when driving/charging with the PC request you need to use a 5v 1500ma (1.5amp) charger. That way it can tell the difference. Standard chargers are 500ma and you will need to read the label for power output.
Recharging the battery is done by connecting the nuvi to a vehicle power cable in the car through the vehicle power accessory outlet or cigarette lighter. The unit can also be charged via a powered USB port off your computer via the USB power/data cable or an AC power adapter through the USB power/data cable.
Don't try and charge the battery directly, as it is a lithium battery it can explode if not charged correctly. You can try connecting (soldering) wires to the circuit board where the socket was connected to feed in 5V from the power adaptor or USB lead.
The Magellan 1200 and several other brands have this problem related to the use of the Mini-B USB connector. Early units where the USB connector was attached only by the solder points suffered catastrophic mount failures. Many times the separating connector stripped the copper clad from the board resulting very difficult repair. Problems prior to total separation were:
intermittent USB data short to power resulting in the unit shutting down. Intermittent opens to USB power resulting in failure to charge the battery or incomplete charge abnormal wear or damage to the USB connector which resulted in pressure catches not holding allowing cable to become disconnected.
I have previously addressed this on another solution involving how to repair, reattach, and secure the USB connector to the board. As in most cases, an ounce of prevention is worth a pound of cure. As I was doing volunteer duty for the RED CROSS, we had approximately 30 of these units. After the tedious repair of the first units to fail from heavy usage, we subsequently gathered the remaining units for modification to prevent failures. It was quite simple. 1.remove 4 screws and the back cover. 2.clean the ground side copper cladding. 3.check the alignment and security of all attachments and connection traces. 4.lay a line of solder the length of the USB connector on the cleaned area of the ground pad as extra re-enforcement also re-solder any connecting points showing signs of stress or cracking. 5.place a piece of cellophane tape over the top of the USB connector after it cooled ( large enough to cover the connector and trace attachments ). 6.On the back cover, where it goes over the USB connector add a small amount of two part epoxy on both sides of the plastic hold down stanchion. 7.Place the cover in place before the epoxy hardens and let it set, once set/hardened re-install the 4 screws.( the cellophane tape will prevent the epoxy fouling the USB connector, which in turn will allow you to remove the back for other maintenance. ( I will attempt to find my pictures and post them later ).
Garmin Support has stated that a fully discharged battery can only be recharged from a computer USB connection, i.e. car 12V and AC adapter do not work. Make sure that your USB computer cable has a true mini-USB connector which conforms to the USB standard, i.e. with a 5-pin connector. There are cheap cables available in many stores which do not conform to the USB standard and have only 4 pins - look for the official USB logo on the packaging to be sure that you get the 5-pin connection.
Note also that a computer USB connection is only a trickle charge, with 500mA available at best, if no other devices are attached to the same USB Root Hub, so leave it connected for 2-3 hours to be sure.
Wiring diagram pinout for Navigon GPS charge and concurrent use
5 Volts Direct Current
Conneted to Pin 4 (GND) as pure short, no resistor
Ground, shorted to pin "X"
Use of standard mini-b will place unit in
Data Exchange/Synchronization mode. Use of mini-b with a 4-x pure short
will allow use of Navigation software and concurrent charging. USB power
source must be 1000 ma or above.
Sounds like you both have a battery problem. I experienced a similar problem when trying to charge via the USB-cable connected to my computer. Ended up buying an original charger (expensive) and the charging went smooth. The car charger should in any case work fine, so probably your battery is not very healthy.
Try holding your finger on the battery symbol for about 10 sec. The unit will then switch to a technical page. There you can observe the battery and charging voltage. When I plug in my computer USB-cable, I read around 4,4V and that is not sufficient for charging my battery. When connected to the original charger, this voltage rises to about 5V which gives a nice charge. When unplugging charger, the unit displays the battery capacity. If the charging voltage is OK, but battery capacity drops quickly after you unplug charger cable, the battery is probably bad. (Of course you have to charge is for some time) I think around 4V battery voltage give 100% capacity. 3,9V gives about 90% capacity. This will not solve your problem, but can give you an idea about what is wrong. Good luck.