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This resistor is for overload its like a protection unit your system may Overload but you need a multimeter to test the Diodes and you might find that one of them is short this can cause the resistor to blown
you can find this resistor in High Voltage circuits
hope it will help
Hi Soz but I dont have the answer for you but was wondering if you could tell me what and where I could buy the U24 because I have A tomtom 300 where the U24 has fried and I cannot see the number on top.If you can tell me my email is email@example.com.
Many thanks Dave
If your TomTom GO/ONE/RIDER is frozen, won’t turn on or does not
behave as it should, it can be fixed by resetting or restarting your
TomTom device. A reset will not delete any data from your device, with the exception of SMS messages on TomTom GO500/700.
your GO/ONE/RIDER to the power charger. If you have a power charger,
use it to power your TomTom GO/ONE/RIDER. If you do not have a power
charger, make sure that the battery in your TomTom GO/ONE is fully
charged. Note: You need to charge your GO/ONE for at least 2 hours using the 12-24V cigarette lighter adapter.
your GO/ONE/RIDER. To reset the unit, you simply have to push a
straightened paper clip (or something similar) into the RESET hole on
On TomTom GO 910/710/510, the RESET hole is located on the bottom of the device.
On TomTom GO 700/500/300, the RESET hole is located on the bottom of the device with the word RESET right next to it.
TomTom ONE, the RESET hole is located on the bottom of the device, with
the word RESET right next to it (just below the SD card slot).
TomTom RIDER, the RESET hole is on the bottom of the device, behind the
SD card door. When opening the SD card door you will see the RESET hole
on the left, right underneath the SD card slot.
Your TomTom GO/ONE/RIDER is now reset. Finally, press and hold the power button for 2 seconds.
U24 is TPS62000 and U25 is LTC1733EMSE . You don't say where in the world you are ? .....so I cannot advise you on where in your country to obtain those parts. They are available from MOST electronics compenent supplyers.
Its almost certain BOTH of those IC's will be blown even if one of them still looks ok.
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" .
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 !
before you start take out sd card. 1 turn tomtom upside down. 2 see reset button? 3 use paper clip to press (press for 15secs) 4 now turn on tomtom (hold power button for approx 5secs. 5 re insert sd card. after a few minutes you should have signal. hope this solves your problem.
Its likely to have blown IC's 24 , 25 and also sometimes possibly 26. You might also have blown the reverse polarity protection diode. Tomtoms damaged this way require a specialist repairer as the solder joint are much too small for the average electronics guy to solder. If you have no knowledge of this type of soldering or if you have not got the special soldering equipment then it will have to go to someone who has repaired these before or go back to TomTom for repair.