Question about Tomtom ONE GPS Receiver

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TomTom One does not power up - burnt component D5 or D9?

I have a TomTom One New Edition that no longer comes up. The green LED is not on either. This happened a couple weeks ago in the car and there was also a burnt component smell that was present. I have opened up the unit and there is one very small charred component in the left bottom corner that is labeled either D5 or D9. Would anyone know what this component is and where I can buy one? My guess its probably a diode or rectifier of some sort.

thanks

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  • junmorales Jan 14, 2009

    i've got the same problem, its actually D5 and i'm looking towards a resolution to it as well

  • gls_1959 Jan 19, 2009

    Using an USB microscope, I've been able to identify the markings on D5. There is a cathode mark on it as well as what looks to be a 0.5 or a omega symbol .5. My guess is that its a plastic 2 lead diode of some sort but there is no way to identify the value or mfg. The research continues....

  • Marlon Guishard
    Marlon Guishard Mar 15, 2009

    You will need the schematics to see the value of the D5 & D9 items. They could be capacitors as well. Mine just will not turn on. I have push the reset several times, held down the power button for several minutes,

    and still nothing. I get the green light when it is connected to my computer usb or to the car adaptor.

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TomTom One uses a Linear Technologies chip LTC3455 as a USB/charger power controller. See http://cds.linear.com/docs/Datasheet/3455fc.pdf. This chip is susceptible to high transient voltages that result from resonances created by parasitic inductances and capacitances of the USB/in-car charger cable . Good designs using this chip suggest that a 1 ohm resistance be put in the path of the cable to reduce the Q of the resonance and hence transient voltages. A 6V Zener diode D5 also serves to protect the chip from these transients.
If the Zener diode is blown it is most likely the the LTC3455 chip is gone as well. You can replace the chip which costs £5.00 (located in the shielded portion of the PCB). The recommended Zener Diodes for this chip are either the EDZ5.6B or EDZ6.2B manufactured by ROHM (http://www.rohm.com/products/databook/di/pdf/edz5.6b.pdf or http://www.rohm.com/products/databook/di/pdf/edz6.2b.pdf). These can be used to replace D5. The STMicroeletronics SM2T6V8A can also be used to replace D5 (http://www.st.com/stonline/products/literature/ds/8694/sm2t.pdf). All the Zeners cost a modest £0.22. I hope this is helpful.
Emmanuel Zyambo

Posted on Oct 10, 2009

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Hello mayby i help You. I am from poland and my english may be not wery good.
D5 is fast diode approximately 3A but when is damage also you need to replace 3455 power chip like this:
http://obrazki.elektroda.net/83_1217150255.jpg

after that tomtom will by repaired if You have more question send it to:
horaczy@gmail.com

Posted on Apr 23, 2009

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