Question about Tomtom GPS
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Posted on Jan 02, 2017
I have worked on several tomtom 710's and 910's with this problem. About 95% of the time the negative pin losses connection and needs to be re-soldered. If you have a OHM meter turn it on to check continuity. turn your unit upside down with the screen facing away from you. The docking port should be facing toward you. Next take the red (+) probe and touch the solder joint on the far left (right below the gold contact pin) then take the negative (-) probe and touch it to the go;d contact pin. If you don't get continuity you have discovered your problem. To repair you will need a number 6 torx driver and remove the 4 torx screws under the ends of the rubber strip (you don't have to remove the strip just lift the ends up). Remove the face plate. There is an indention on the case on the bottom so you can get a finger nail under it. Pry up carefully till you get it off. Next the back housing should come off ( you have already removed the 4 screws). After removing the back housing you will see 2 torx screws on the top remove them (this is the sat antenna). You don't have to remove this piece. Next remove the 4 screws holding down the motherboard remove them. Next gently pry the motherboard up but be careful, you have to remove the speaker and battery cables before removing it completely. Also be careful of the wire spring on one side, this is your phone antenna.
After removing the motherboard check again for continuity. The gold pin on the far left (with the contact pins closest to you) is the negative side. The contact pin to the far right is the positive pin. Normally all you have to do now is use a small soldering iron and and re-solder the soldering joint just below the contact pin.
Hope this helps
Posted on May 29, 2009
This is not a solution, it is a new problem
my tomtom was working fine until I connected it to my computer using the latest TomTom Home. It now flashes a white cross and TomTom Home says "No device connected". My TomTom is useless now and does not work anymore.
Posted on Dec 27, 2009
I have managed to fix my TomTom one.
The problem was two fold. First the diode D8 was blown and also the power supply chip was blown.
It is a tricky job, using surface mounted components so should not be attempted by a novice but I managed it.
I have a full set of photos etc if anyone cares to try it. I figured - NOTHING to loose!! so what the heck and just went for it. Taking it apart was fun! The surface mounted IC was easy to obtain and the total cost was about £10 plus 4 hours panic labour. If anyone wants the info just let me know and I will send the photos - but no promises - it worked for me.I figured out this ongoing problem. I purchased my TomTom One second edition 1/20/07 for $395. I was 30 days past my warranty and had the problem of unit not turning on. Green light came on when charged.
I opened my unit up and found the sw2 micro switch broken. If you press too hard on the on/off button, this will eventually happen.
I couldn't find a replacement switch so I wired my own switch and it works now.
Posted on Oct 26, 2010
Testimonial: "thank you so much,I really appreciate your help and promptness. If you can tell me exactly how you fixed yours it would be very helpfull. Thanks again"
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