Tomtom go 720 question

Joined
Apr 16, 2008
Messages
6
I have a Tomtom 720 and since the battery doesn't charge, because my father blew out some chip on the board, me and my father decided to connect the Tomtom car charger straight to where the battery connects to the main board. When the battery was full,l the unit was working with no problems. Plugging the usb underneath the device, or connecting the car charger doesn't work. It only runs off the battery.

My father cut off the battery connectors (red, yellow, black) He kept the battery connector in the socket. He also cut off the cigar charger wire and it has 3 wires ( red, black, white). Would it be ok if we connected the black, red, white to the battery connector (red, black, yellow), so like red goes to red, black goes to black and white goes to yellow?

yellow and the white wire are the same right? both sensors?

If you think this is not safe, please let us know. We are waiting for someone to post a Broken Tomtom go 720 and just rip out the main board and use it. Cant find any one ebay lol.

Thank you.
 

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I might be wrong here but I think your are about to create even more smoke from the TomTom if you try doing this for the following reason:

The car charger is designed to output +5V DC and one of the three cores is actually a voltage sense wire feeding back to the regulator chip in the ciggy lighter plug.

The Battery in the TomTom is 3,7V DC so in connecting the charger straight to this you will over voltage the board burning even more parts out, the battery spec can be read from this picture:



AFAIK the yellow wire from the battery is to regulate the charge current depending upon temperature of the cell, get this wrong and you run a very high risk of the Li-Pol cell catching fire.

How did you blow part of the board in the first place, had you been messing with the car charger lead or did it simply let go? eitherway I would bin the car charger lead and start again, faulty car charger leads have been well known for blowing the electronics inside the Nav units for quite a while - Mike
 

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