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One possible cause is that your battery is low or the battery can no longer hold a (good) charge. In this case, the TomTom is shutting down because there's not enough battery to keep it running, even though it is plugged into a power source.
To determine if the battery is the cause, try to charge the TomTom battery .... using a (USB) connection to your computer, or a direct power source (i.e. while the TomTom is not being used). Let it charge for a few hours until the batter charge indicator shows that it is fully charged (or just leave it charging overnight).
Then, unplug the TomTom from the "charger" and power it up. If the TomTom (battery) doesn't hold a (good) charge, the device will shut down within a few minutes, e.g. 10 mins or much less.
When you (then) plug the device into a power source, and it doesn't stay on (i.e. it keeps shutting down after 10 seconds), you can safely conclude that the battery is the cause of your problem.
The device can be run from the lighter plug without being charged first. The obvious answer is: plug in the device again; when the car is key is in and electricity switched on, it should charge again.
Most Tomtom devices also come with a standard USB cable or charge cradle with non-standard connector on device end (but USB on the other). It plugs in a PC for use with the Tomtom HOME software and also for charging.
To my experience, battery capacity and life is very poor for the GO 730. If brand new, the battery can last up to three hours but this degrades quickly. If its cold, the electrochemical process in the battery is slower, adding to the problem. Also, switching off the TomTom does not really switch off, it goes to standby, still using a little power continuously. After a day or two this completely drains the charge. I have my GO 730 since mid 2008 and battery is down to ten minutes of use after a full charge. In my car I use the provided car DC adapter, so I do not mind the bad battery too much.
If you have made a recent update this may be the reason you may have lost your FM transmission!!
Tom Tom disabled silent FM transmission on these units to comply with the law in certain countries which prohibit these FM transmissions. Later updates configured the units to output lower strength FM transmissions.
connect it to a power supply and leave it for a few hours A battery that is totally depleted will take some time to recover and not show that it is even being charged as power is too low to light the LED.
It will require a full charge of about 10 hours to get it fully back into service. But the LED will ( or should turn on) after about 1-2 hrs depending on the condition of the battery. If after the charge the battery does not hold a charge lasting on average about 2 hrs , then change the battery.