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I am having same trouble. I contacted Navman NSW and went through all the settings without result. It was suggested that the problem could be the external antenna, if not a fault in the machine. I have seen an after market antenna for about $19 so I might try that. It does seem as though the antenna is not talking to the Tracker.
Its water ingress causing a short in the high voltage wiring PCB.
Open the unit with a 1.5mm allen key, unscrew the power/data cable sockets with a spanner and GPS antenna inlet with an 8mm socket (no antenna socket on i models) .
Where water has arced there will be burning black on the green PCB evident, cut the gold PCB flat wire and remove the section around the burn.
scrape a small amount of green off the gold flat PCB wire so you can solder a new wire to bypass the short. any 2.5mm insulated wire will do to bridge the gap you have just scraped away, there is plenty of room for a 1 inch wire.
Dry the unit and seal with silicone to prevent re occurrence.
Its a 2 hour repair requiring a high DIY soldering standard but off set it against the time it will take to reload you waypoints in a new plotter , its well worth the trouble.
ok my aussie compatriot your problem is mainly the battery not being fully charged on the ac charger, it also needs a clear view of the sky. most tomtoms have an external antenna port mmcx but dont buy thoise cheap 28db units as they are trouble, go to Marbella Australia and get one of their 50Db external mouse antennas and that will help tremendously. Perhaps dump your tomtom while your at it as they are nothing but trouble. just check the numer of issue son this forum. check out the A8010 or the super A860 on the marbella site then sell off your tomtom
Besides the two screws the back lit is "clicked" to the front lit. I used a small screwdriver and carefully pushed it in between the front and back lit and after some careful manouvering it clicked open at several positions. My battery was glued to the electronic print! Again using the small screwdriver and watching carefully not to turn on the power I was able to remove it. This procedure is certainly not an advocate of Navman! But in my case it worked ....
I have seen this with cameras, and pocket TV sets.
It is best to send the unit back for factory service. Ask for an estimate before servicing.
The parts in your GPS are not generic parts. You can buy the screen from the manufacture and find that the circuit board under it is also broken or damaged.
You may also find that the cost of the screen replacement may approach the cost of a new unit. I have seen this on many small devices. In some models the screen module comes as part of a complete matched assembly.