Hello, I have a TomTom One New Edition 4N00.005 (US/Canada) 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. 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. Can anyone identify this component?
D5 is a EDZ5.6B http://www.rohm.com/products/databook/di/pdf/edz5.6b.pdf ,
probably the power controller is broken too (ltc3455) http://cds.linear.com/docs/Datasheet/3455fc.pdf
MMD, April 2013
TomTom D5 burned out here too... Same problem, lack of solid info for a replacement part and 3 hrs on the phone with TomTom supervisors they dont even have a support center that fixes them to tell me the part #.
chances are unless your a pro you will over heat the board and surface mount resistor re affixing it. I did one micro surface mount before took 3 trys.
Ed, April 2010
can any one tell me the part number for D5 on a tomtom one new adition 2 yrs olds old,it is burnt,do i have to change a ic ,if so which one thxs
debbiebriscoe, December 2009
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
Emmanuel Zyambo, October 2009
You need to replace power chip with this
Andreas, May 2009
Hello,
On my tomtom one the D5 comonent was also blown (due to a bad charger). A friend replaced it with an SMD equivalent to the 1n4007, but no luck. Maybe another component needs to be replaced as well. Did anyone succeed in fixing this?
bram, March 2009
if you replace this diode with the 1n4007 should everything be ok then??
christopher Spencer, March 2009
Hi Garry,
Any luck identifying that component?
I just opened a faulty TomTom one this evening and noticed a charred component called D5.
saw your post and wondered if you had any luck
Frank, February 2009
D5 is a surface mount rectifier diode equivlent to the conventional diode 1n4007. its used for reverse polarity protection.
