Accidently disconnected the working TT 510 unit from the base before switching it off. The base was on the charger... I can't switch it on since that time. However, if I put it on the charger the green led indicator lights up, but nothing happens, still can not be switched on. Also, I can not feel the unit warming up after a considerably long time on the charger...Can you help me what to try please? Thx! Laszlo

The Car chargers are generally the defective unit.
I have also faced a similar issue as the spring loaded cigarette lighter was pushing the charger causing it to disconnect.

Yes that is look like a miss setting in manual mode verify for your shutter speed setting or so/and if you have the user guide, help you may find the problem
if not thats could be an electronic problem or dusty
thats all i can say or do from here
good luck, hi hope that willhelp
have a nice day..

found on a ford explorer forum...
this may be what you need.
1- Pressed the mode switch several times to make sure I did not put the
unit in the blank mode accidently (did not work)
2- Checked the 7.5 A fuse number 10 and it was Ok
3- Removed the two screws holding the unit to the ceiling and pulled the unit
from the front to release the two clips.
4- I used a T-10 security bit to disassamble evey thing in the unit and to
get to the printed circuit board.
5- I found two surface mount resistors next to each other with 510 printed
on them that were cracked off the board (you need magnifing glass).
They overheated (poor design) and they desoldered themselves off the
board.
6- You can resolder them or better replace them.
7- I used two 68 ohms quarter watt resistors (to reduce power disspation)
and soldered them in their place.
8- You can check your work by attaching the board to the wire harness and
to the plug in the ceiling and turn ignition on.
9- If everything is Ok (as I hope) disconnect the board and reassemble the
unit and install it back.

If you are not bothered about using it on battery your tt should work if you have it hooked up to a external power supply such as the car charger or home charger. If it doesn't work using either of the power supplies then your problem is deeper than just needing a new battery. Check the pins on the bottom of your tt to see if they are bent, or out of place. The most common problem for them is the negative pin on the far left with the lcd screen facing away from you gets bent or is not making contact even though the green light is on.
Hope this helps

Using a OHM meter set it to check for continuity. Turn the unit upside down with the charger contact pins closest to you. Using the red (+) probe touch the solder joint directly below the gold contact pin on the far right and the black (-) probe to the gold contact pin directly above. Next do the same thing to the solder joint and gold contact pin to the far right. If you don't get continuity on either pin there is your problem. This can be fixed but it requires taking the unit apart and having some solder skills.
Hope this helps.

hold the select button down a few seconds until you'll see a 'tn' on the readout. this sets it to tone. hold it down again and it will set back to 'Pu' for pulse. i figured this out by accident. the losers at vtech never answered my question.

I had similar problem this morning. Last time I was using my TT was about 3 mths ago and it worked fine. 2day I switched it on, the first screen appeard but the, TT just switched off. I put my friends SC card and it started... . Looks like soft on SD issue.
I have a buckup file but at 87% it fails ... Lifes a ..... :D
My advice is to download and install new soft on your SD card but what about maps U/me bought with the TT?? Have no idea

www.batteryship.com

look up tomtom 510 - or whatever model you have
Order the battery..........comes with manual and tools to fix it
only 20.95
it works

cheaper than sending it in!!!!!!
These are genuine replacement parts!!

Laura

Why bother.  Send in with copy of receipt.  One Year Warranty covers most problems (not physical misuse or abuse though)  Do not open unit.  Will invalidate warranty.

I'm facing the same problem with my plantronics 510. Would love to hear if it is fixable. I've already bought myself a new one (tip - look at craigslist for a cheaper deal than even ebay and amazon)