tomtom wired in failure, help

  • Thread starter Thread starter yellowgs
  • Start date Start date

yellowgs

Guest
hi i have just used the in car 12v connector to directly wire in my tomtom rider 1, due to cradle problems i thought it best to use the bottom dc port. now i have done that the tomtom will not turn on. have i fused the tomtom, does it have an internal fuse? are there tomtom repair people out there. i am in lincolnshire, please help i am of touring in 30 days.

carl:blast
 
If it is in the cradle try taping over the connectors in the back of the unit to fool it into thinking it is not connected to a cradle.
 
no it is out of the cradle, just will not power up at all. not with mains on or computer link.
 
I Reckon...

...You've reversed the polarity on your wiring.

Did you check the connector voltages with a multimeter before actually docking the device to it's power source? :nenau

I don't know precisely what electronics are on the power input side of these units but, if it's like anything else that uses electrons to activate it, it will be very upset :( about the condition I have postulated above.

There could be some protection, and it might be a fuse or diode or two, but you'll have to look at the circuit board to determine this and to identify the correct parts. :blagblah

You need to find a mate with a bit of electronics savvy and access to google and search for those who have reverse engineered the circuit board.

I can see me writing some How To's around here soon. That'll be when I've listed all of the electrical and electronic queries that show up and worked out what's being done to these bikes.

Sorry mate but it's back to first principles with this one: check your voltage polarity.
 
I assume you have no power left in the internal battery. My TT 1 had a fault with the power socket in the base of the unit and would only charge from it if I wiggled the connector. I opened up the unit and found the solder joints to the circuit board were cracked.
 
DitchWater said:
...You've reversed the polarity on your wiring.

Did you check the connector voltages with a multimeter before actually docking the device to it's power source? :nenau

I don't know precisely what electronics are on the power input side of these units but, if it's like anything else that uses electrons to activate it, it will be very upset :( about the condition I have postulated above.

There could be some protection, and it might be a fuse or diode or two, but you'll have to look at the circuit board to determine this and to identify the correct parts. :blagblah

You need to find a mate with a bit of electronics savvy and access to google and search for those who have reverse engineered the circuit board.

I can see me writing some How To's around here soon. That'll be when I've listed all of the electrical and electronic queries that show up and worked out what's being done to these bikes.

Sorry mate but it's back to first principles with this one: check your voltage polarity.
Click to expand...

it appears i have hit the device with 12v when it should only be 5v, do you know if there is a fuse inside or some kind of surge protection that can be reset
 
F**k.

Sorry for the late reply here:

There may be a surface mounted fuse of diode on the circuit board close to the 5 volt connector you used. It's a matter of disassembling the device, extracting the circuit board, following the tracks from the 5V connector to the first set on very small things soldered onto the board. The fuse is likely to be slightly larger than the other components (resistors, diodes and capacitors) and it may be labelled as a Fuse, with a current rating, or not as the case may be.

You're going to have to take it apart and inspect it very closely, under a magnifying glass if your vision is anything like mine, and see if you can determine what's there.

I might be able to help you a bit more tomorrow because a geezer I work for is having problems with one and I found it in pieces last week and still think that's the case. I'll see if he'll let me help him, he will eventually concede and put it my way, and I'll have a look and see what's going on in there.

No promises but something could be done, unless you're really unlucky and it doesn't have any protection at all and you've blown the integrated circuits, but that'll be poor design in my book.
 
yellowgs said:
hi i have just used the in car 12v connector to directly wire in my tomtom rider 1, due to cradle problems i thought it best to use the bottom dc port. now i have done that the tomtom will not turn on. have i fused the tomtom, does it have an internal fuse? are there tomtom repair people out there. i am in lincolnshire, please help i am of touring in 30 days.

carl:blast
Click to expand...

ive done the same thing,you have cooked it,its only 3volt tomtom 1 the cig ligter is a transformer from 12volt!! :blast
 
DitchWater said:
Sorry for the late reply here:

There may be a surface mounted fuse of diode on the circuit board close to the 5 volt connector you used. It's a matter of disassembling the device, extracting the circuit board, following the tracks from the 5V connector to the first set on very small things soldered onto the board. The fuse is likely to be slightly larger than the other components (resistors, diodes and capacitors) and it may be labelled as a Fuse, with a current rating, or not as the case may be.

You're going to have to take it apart and inspect it very closely, under a magnifying glass if your vision is anything like mine, and see if you can determine what's there.

I might be able to help you a bit more tomorrow because a geezer I work for is having problems with one and I found it in pieces last week and still think that's the case. I'll see if he'll let me help him, he will eventually concede and put it my way, and I'll have a look and see what's going on in there.

No promises but something could be done, unless you're really unlucky and it doesn't have any protection at all and you've blown the integrated circuits, but that'll be poor design in my book.
Click to expand...

thanks for this, it appears i put 12v straight in so i am hoping i have just blown a fuse, as like a proper tosser i did not realise that the 12v had to be stepped down to 5:blast will look forward to any ideas.
 
I've soldered an adaptor to my tomtom1 and plug it directly into my lighter and i've never had a problem with it, when i use it on my bike i just find a permanent live and plug the bare wire on the spade of the fuse also with on problem?? I do find if i don't use it for a period it usually takes a wee minute to switch on..
 
Further to This...

...I have had a quick, and I mean quick, look inside a TT2 and found there are two diodes and a 2 x inductor module. I believe I buzzed them through to the 5v power connector and if anything is going to go, it'll be those diodes.

I didn't get their spec and that will take a bit of investigating but, try using your DIODE setting on your multimeter to test them. With the red & black cables try measutring both ways around the components (they are about 6mm x 3mm and both together) and see what you get. One way round you should get a voltage reading of about 0.2v and the other way round you should get ZERO: These are the working conditions.

If you get ZERO both times them there's a hole in the component and no connection whatsoever.

Also use your resistance measurement through the four pin inductor. It contains two coils which should read almost zero ohms but, if you get INFINITY then the coils have evapourated.

All of this requires a bit of inspection and knowledge so, try a mate who might know.

Having a reverse engineered circuit diagram of this would really help: Anyone?????
 
thanks for the info, i actually told tomtom your views, they agree. so they have agreed to complete a free diagnostic of the devices. i will let you all know what they come back with
 
yellowgs said:
hi i have just used the in car 12v connector to directly wire in my tomtom rider 1, due to cradle problems i thought it best to use the bottom dc port. now i have done that the tomtom will not turn on. have i fused the tomtom, does it have an internal fuse? are there tomtom repair people out there. i am in lincolnshire, please help i am of touring in 30 days.

carl:blast
Click to expand...

the "bottom DC port" is the 5v positive centre pin connector, NOT 12v!!!

If you have connected it to the tomtom without using the mount im afraid you have just cooked your TomTom. Sell it for spares/repair on fleabay.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
You must log in or register to reply here.


Back
Top Bottom