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Re: wont turn on
These units seem to be suffering from a bad connection on the inside of the unit. My wife's did the same thing. There was a connection inside that wasn't making contact. First try cleaning the 4 brass connection tabs on the watch and check your charger to make sure the tabs are raised and not squished. Second try to reset the unit. Hit mode reset and power buttons all at the same time. Hold these for 3 seconds and then release. If these do not work here is what I did. There are no screws holding the unit together. I used a exacto blade to very carefully pry the unit apart along the side seam. It's not easy to do. Be very cautious and gentle. Work the thickness of the blade into the joint to gently wedge apart. You are not trying to remove material! Once apart you will see some fingers that make a connection between the upper and lower part of the unit. This is where the problem was with my wife's 305. I gently raised these tabs to make a better connection, It's been working ever since. I didn't try it before but try pressing very hard on the unit where it says Forerunner 305. The case is very hard so it might not work. But if it powers up when pushing you found your problem. Hope this helps. Here is a link I found on opening a 205 (Same process) http://ctorunner.googlepages.com/dismantleforerunner205 To put the unit back together use Automotive silicon/gasket maker. Use a tooth pick to put a VERY small amount of silicon around the entire seam. Put the two half's together and wrap tightly with electrical tape. Test the unit immediately to see if it powers on and off. If it does not open it back up and raise the small prongs that make the connection from the bottom half to the top half. If any silicon squishes out the sides wipe with water and a rag. Let the unit sit over night. In the morning remove the tape.
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Put the receiver in the charging cradle. Does the green charging light appear? If it does not, you might just have a defective cradle and hence a completely flat battery; try charging with the car charger and retry. If it doesn't charge with either charger, the power section of the TomTom is obviously gone.
Assuming you now have a charged TomTom, keep the power button pressed for five seconds. If it does not turn on, try resetting it by inserting a paper clip in the RESET hole hidden below the front cover.
If it still does not turn on, it's either a defective power button or a faulty mainboard, and I'm afraid you can't easily fix either; you'll have to send it to maintenance.
not sure how long you have had this, but if the unit was completely turned off or battery completely dead, you have to hold the power button for about 15 seconds for the 3000t to start up...assuming the charge light at the top right is orange (that means its charging) no light means its not charging, green light means fully charged. if there is no power light on at the top right of unit, either the charger is bad or the port on the board is bad (which i do have) good luck and hope this helps. bill
I faced the same problem. Here is the detailed answer I received from Garmin support. It worked for me!
Please put the 305 on to charge.If the screen is blank, press and hold the Mode button and then press the Lap/reset button as well and hold them both for 2 or 3 seconds.After a few seconds you should see the "battery charging in progress" message.Then leave it to charge for 30 mins.While it is charging, download your training history to your PC.
Once it has charged for a while. Remove it from the charger and switch the unit off.
Press and hold the Mode button and then press the Lap/reset button as well and hold them both for 2 or 3 seconds.
Then press and hold the Mode button again and this time also press and hold the Power button.The unit should switch on and have a message on the screen saying ?Do you really wish to erase all user data?.Select YES and press enter. The unit will reboot and ask you some questions including if you have a heart rate and cadence sensor.
I then asked them again:
Before I do the 2nd step which resets the data, will it erase only the training data (tracks etc.), or also all the other user data like profile and such? If yes, are these can be backed up too?
Why is the complete reset required if the Edge is back to life? Do you suspect some data corruption or inconsistency?
And they replied:
The complete reset is required because this could occur again in a few days time.The complete reset will wipe everything including history, workouts, courses, user profile, data field settings and almanac data.
The first time you connect the GPS to your PC after doing the reset you will get a message saying that the profile on the device is different from the profile in the program.You will need to choose to keep the profile in the program which will then transfer your user profile back into the GPS from Training Center.
Have you also held the power on button for a couple of minutes, with the battery installed, and without the battery installed. There is an issue with the garmin dying, some cases a new battery helps, other cases, just leave the battery to charge for several hours, worst case is that you have to ship it to Garmin. I had a couple of Dead Zumo, however, removing the battery for several minutes, putting it back and clipping the zumo in the car holder did the trick for me. I also have a spare battery and allen wrench, just in case...