Question about Tomtom One XL GPS Receiver

3 Answers

Require value of D5

Can somebody please tell me what type of diode D5 is? It's adjacent to the USB socket on the other side of the pcb.

If anyone has a component list and/or schematic I'd love that too. Please advise & I'll supply email address.

Thanks,

****

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  • Anonymous Sep 25, 2008

    D5 blew here, released the 'magic smoke' at an arbitary time

    slightly worrying if this is a regular occurance, darned thing was a month out of warranty

    i've a feeling that, being where it is, it's a reverse polarity protection diode, shouldn't really have to worry about its value,

    will try shorting it once i find my soldering iron


  • Bubba1965 Sep 27, 2008

    Thanks support551.



    I had a feeling it was for reverse polarity protection. Either that or a 5V Zener. Thanks for the info. Greatly appreciated.

  • gls_1959 Jan 22, 2009

    Does anyone know if the Rectifier Diode D5 on the TomTom XL is the same one used on the TomTom One unit?

    Thanks

  • henrikss Feb 17, 2009

    I have the same problem and I will get a new diode tomorrow.
    BUT which way do I mount the new diode?
    The old one is toast so I can not see any markings.
    Thanks!

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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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If its the tomtom one xl.D5 is a surface mount rectifier diode.equivlent to the conventional diode 1n4007

Posted on Sep 26, 2008

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I have noticed that the D5 diode has burned out on many a Tomtom one xl. Tomtom knows this, that is why warranty is for a year and why they have no out-of-warranty repair. I sent the info to Consumer Reports.

Posted on Aug 06, 2009

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