Question about Tomtom ONE GPS Receiver

2 Answers

Photos of tomtom one power on fix

Hi,
please could you send me the photos of your tomtom one fix ?.
I have the same problem,with tomtom not switching on.

My email address is stuartclee@tiscali.co.uk

Thank you

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  • 5 more comments 
  • morc53 Mar 16, 2009

    with a tomtom one the diodo zener is burn but i want to know the number for the diodo zener and the volts

  • morc53 Mar 25, 2009

    can you send pictures for a tomtom one 3rd edition for located the chip for the power supply thanks

  • john466 Apr 23, 2009

    I have had the 'Green Light of Death' creep up on me. At first it was related to external power and I could get my TomTom One 4N00.001 to start on internal power if I waited 10 minutes or so. But now its just dead. I've been inside, its different from the pictures, and found that a very large current flows (>120mA)between the 'on' switch contacts when I put a meter across them. Looks like bad news... At the current cost of new devices and the high cost of repairs I'm thinking of trying something along your lines. Do you know if the bits are the same? I'd greatly appreciate your comments.

  • spiderman58 May 11, 2010

    I have desold the LTC3455EUF to replace it, but now i don't know the sense with i have to sold the new chip!? Someone have a hight resolution image of this zone of the pcb?? Thank you all in advance. Bye. Doriano. My email: breath@tiscali.it

  • spiderman58 May 11, 2010

    I have desold the LTC3455EUF to replace it, but now i don't know the sense with i have to sold the new chip!? Someone have a hight resolution image of this zone of the pcb?? Thank you all in advance. Bye. Doriano.

  • cool max Jan 19, 2012

    after replacing the the zenner and LTC3455 the unit still has GLOD.i know both the components have been changed properly and are working(tested) the is another fault which i can't work out.the power on/off switch is grounding..any help on this?

  • Bill
    Bill Oct 25, 2013

    cold you send me pics on how to fix my Tomtom ? Thanx, Bajawfo@yahoo.com

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Attached is a sequence of photos on how to get to and change the power control chip - the one that is probably damaged. This is for the Tom Tom I repaired and yours could be different however, there will be a power control chip of some kind (check out the part numbers to see which one it is) and it will be this that is damaged and will need replacing. The Power control chip is the hardest to replace as you cannot get to the 'legs' to solder them. To remove the old one, just apply a large soldering iron bit (with a blob of solder on it to make good thermal contact to the top of the chip) and heat up the whole chip until it is free. Lift it off straight away with tweezers. Clean up the solder pads with solder wick and then apply a SMALL amount of solder paste to each pad. It is improtant that this is a SMALL amount and is equal on all pads so the new chip sits square and true when you put it on. Make sure the chip is in the middle of the pad patern and push it into place. Now for the tricky part....either usa a large soldering iron and heat the chip until it melts the solder paste and drops into place or, use a hot air gun with a small nozzle and do the same thing. Great care needs to be taken to ensure you do not heat up the near by parts so the soldering iron is best but you have to remove it as soon as the chip falls into place. The surface tension of the solder should centre the chip up if it is slightly out but you need to get it possitioned as good as you can before you heat it up. Take care not to move the chip as you heat it. You will need a fine bit in the soldering iron for the diode and any other parts you may need.

You should start with TT1 and work through to TT7.

As well as this chip, if the power supply went high (12 volts) then the zener diode on the input to this chip will also have been destroyed - you should see signs of this just by looking at the device (see photo TT6)

The most difficult bits are: -

Opening the connector to the LCD. This can be done by gently lifting up the PCB to see the connector on the back and then pushing up the 2 ends of the connectors white locking bar. Replacement is also very tricky but with care it can be done. As an alternative, you can remove the LCD complete by gently flexing the plastic surround to it and freeing the display from the case. It is then easy to disconnect and re-connect the LCD to the PCB.

Removing the tin cover from the back of the PCB so that you can get to the power control chip. This takes time and a hot soldering iron with good solder wick to remove the solder. Having liberated a couple of lugs you can remove the others by gently lifting the cover near to a lug and heating that lug to pull it through the PCB. Don't burn your fingers though!

The parts are easy to obtain from either Farnell or RS Components - RS have trade counters you can go to and Farnell have a retail side CPC you can find them at http://cpc.farnell.com/. If you have problems let me know and I will see what I can do.
photos of tomtom one power on fix - 1f3ac3f.jpg2967b19.jpgphotos of tomtom one power on fix - 7d94e2e.jpg1ea2d29.jpg7d94e2e.jpgfece292.jpg

Posted on Dec 17, 2008

  • Aaron Horn
    Aaron Horn Dec 20, 2014

    This is really old now but do you have any higher quality pictures of the PCB around the USB connector for this model? I have accidentally removed a few of the smd resistors and need to put them back in place!

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Fantastic guide, thanks so much.

Just to add - Farnell order codes:
5.6V diode

Manufacturer:
ROHM
Order Code:
1679979
Manufacturer Part No:
EDZTE615.6B
Power Chip:

Manufacturer:
LINEAR TECHNOLOGY
Order Code:
1273944
Manufacturer Part No:
LTC3455EUF#PBF



Posted on Aug 09, 2010

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