Green Light / Dead Tomtom - Please help with component id
I have accidentally plugged a 12v supply into my tomtom 500 ( which I think is basically the same component wise as the 300 ) and blown it up.
I know through reading posts on this forum that I am not the first idiot to do this. The unit is dead apart from the green light, on inspecting the panel U24 is burnt although U25 and the board print seem ok. My problem is identifying a surface mount component which got completely burnt up.
as you can see from the picture I have removed the component which I believe to be a diode. If anybody knows the value of the component and the number of a possible replacement I would be very grateful. I am led to believe that a 1N414n might be suitable but have been unable to obtain one.
If it is a diode I would also like to know which end the anode is soldered onto, as I say any info on the component would be great.
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Re: Green Light / Dead Tomtom - Please help with...
That diode is a reverse polarity protection diode. An 1N414 will do ( available for very very little from almost ALL electronic component suppliers.) If there is NOTHING ELSE WRONG then the tomtom will still work without this diode. Its not needed in normal operation anyway. All it does is cause the fuse to blow in the cigarette lighter plug if the polarity is accidently reversed. Therefore , with a correct supply , it does nothing !
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check to besure your power supply fuse is not blown, other wise sounds like you have it connected to wrong 12 volt source, I think there sould be 2 12v connections to the radio one when the car is powered the other constant power.
I'm using the TomTom Go 730T - I think this is the latest and the last TT with Traffic because TT stopped supplying this option. I'm having the same problem from time to time but a reset helps. Just press the Reset button and after restarting the traffic option is back.
Power supply has several voltages. Just because the 5v power is active doesn't mean all the voltages are OK. You need to have the power supply tested for 12v and 3.3v. A quick test is to unplug all the wires from the power supply. There is a single green wire on the motherboard main plug. Connect (use a bent paper clip) that green switch wire and any black wire. Plug in the power supply and it should run (fan starts)
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Take a look inside your tomtom go . The photo's uploaded are of the GO and Go 300 / 500 / 700 series so yours might not look exactly the same but will be similar to these. SEE PHOTO of the IC's highlighted RED. U24 is on the same side of the circuit board as the card reader. U25 is on the same side of the board as the power socket. These are the 2 chips / IC's that will be blown if reversed supply or more than about 6 volts has been applied. The blown components are usually blown due to attaching the WRONG charger or a faulty charger. ( the tomtom cigarette lighter leads often go faulty ) These IC's are very very small ( just 3.5mm across ) and the 10 pins ( 5 on each side ) are even smaller and very close together therefore normal soldering ability will not allow a novice to replace them. Special soldering irons are needed , magnifying glass or special microscope for electronics + a steady hand and good light. Its highly unlikely that a home repair is possible. Besides that , even engineers with years of soldering experience have great difficulty replacing these components and it often takes me 30 minutes just to replace one of these IC's and I have a steady hand. Most normal electronics repair companys cannot repair this type of component as they will normally deal with bigger things. So unfortunatly, your "corner of the street" TV repair shop won't be able to fix it for ya either. As far as I know TomTom don't repair these IC's either as its too fiddly and time consuming and for them not worth the effort. Your only hope is one of the repair people offering this service on online . Try a look on ebay under "faulty tomtom" .
If you have the green light lit on top of the tomtom but it won't switch on , then you have a condition commonly known as "the Green Light Syndrome". Most likely cause is blown components inside the tomtom that regulate voltage. The reason they blow is usually due to user connecting incorrect charger ( such as a 12v one for a phone ) or sometimes the tomtom charger goes faulty and instead of ouputting 5 voltas it outputs 12 volts and damages the tomtom inside. the parts are not easily repalced and require a specialist repair centre that has good experience of repairing tomtoms. You cannot repair it yourself using a normal soldering iron. Good luck.