Question about Tomtom GO 300 GPS Receiver

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Tomtom go 300 u24 u25 and B

Hi....having problems working out what component B is ?

Can u help?

Thank you

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  • star_pilot Apr 26, 2008

    Hello, as mentioned earlier it is positioned next to component number 523 b240 and may be a reverse polarity diode.

    It is black in colour, 2 connections either side and has the capital letter B in gold stamped on with a gold line at one end.Its located 1cm to the right of the power jack socket.

    I am looking for a part number if u can help.

    Also, if only one u24 or u25 is blown, do u have to change bpth?

    Your helpis appreciated.

  • star_pilot Apr 26, 2008

    Hi sorry, I have accidentally clicked fixya.

    It iss located in the area of the board with the number 5.And is the second component down on the opposite the on/off switch.side of the circuit board.

    Hope this helps

  • star_pilot Apr 26, 2008

    Hi, thanks for your comprehensive answer. Judging by what you have said its the idiot diode.

    Can I remove this and bridge the connection?

    Thanks for your help..will bother u no more.

  • star_pilot Apr 26, 2008

    Thanks for your help.

    One last question....can the idiot diode be removed and bridged across?

    Will bother you no more.

  • pelican1952 Sep 02, 2008

    Hi where can i get a IN414N



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i have been lloking for IN414N without any luck..

any other ref ?

thanks a mill

Posted on Jul 08, 2008

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Sorry , we need more info on position of what you call 'B' ? Which component are you reffering to ? I don't know component "B" .

Posted on Apr 26, 2008

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  • Ken Roberts
    Ken Roberts Apr 26, 2008

    where is component B on the board ?

  • Ken Roberts
    Ken Roberts Apr 26, 2008

    OK , here is best info I have as I have NO components in that area that are marked ? so , I do not see any components marked 523 or b240 , also I have NO components with a letter B on it. Comeponets that are black and like a small brick with a line across one end are either a diode or an electrloytic capacitor. On tomtom go 300 the component between power in socket and battery socket is BLACK and is simply a straight through filter. ie bothe neutral and live go straight through it. I can tell you that this very rarely blows. Usually it is only U24 and U25. Check also the small diode on the switch side but directly oposite the switch next to the 2 large diodes. ie. it is near to the power socket SOLDER SIDE of board. This small doide is the 'idiot diode' , revers polarity protection. I might add that most GO 300 boards I have here have very few component ID's screen printed on the PCB , theres hardly anything at all only the IC 'U' numbers and test points. This is why I am puzzled by your reference to 523 and b240. The 2 IC's U24 and U 25 dont always blow both , sometimes only one. look for signs of a small eruption on the IC or a tiny crack . Any brown mark or burning under the chip is also a sign. If you remove the IC's and have all the tracks intact you are very very lucky. GOOD LUCK.

  • Ken Roberts
    Ken Roberts Apr 27, 2008

    OK , now i see . The 2 large diodes are marked B240 . ..... looking at the PCB with switches at the top and the 2 diodes B240 bottom left. To the left of those and very close is small ceramic capacitor and just above that is the diode. ( this diode is about same size as the small capacitor ). I have also found this diode blown on some boards. You can replace this with a easy to obtain IN414N . this is a standard diode with normal lead connections but is small enough to fit . DO NOT BRIDGE ACROSS it, because this is the reverse polarity diode, this will introduce a short circuit. TomTom might work with this diode removed ( no diode ) but I have never tried this .



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