Tomtom 7150 power issue

Discussion in 'Technical Support' started by SteveW10, May 20, 2018.

  1. SteveW10

    SteveW10

    Joined:
    May 20, 2018
    Messages:
    3
    Likes Received:
    0
    TomTom Model(s):
    7150 Truck
    Hi, I have a 7150 Truck (one of many on our fleet of lorries) It suddenly stopped working, will not switch on at all. I tried all the usual, charge for 2 hours, hold the power button for 30 seconds and so on.

    The power button lights up orange and no longer reaches green. So, i moved on to the next stage of investigating, opened her up and checked the battery voltage and it's only reading 2.85v, (should be 3.7v) when plugged in to a charger this doesn't change, it remains at 2.85v. The battery is a VF1C.

    Would you start looking at component failure or battery failure? I have read that a Zener diode is an issue on other models?

    Thanks for looking
    Regards
    Steve.
     
    SteveW10, May 20, 2018
    #1
    1. Advertisements

  2. SteveW10

    dhn Moderator

    Joined:
    Oct 1, 2007
    Messages:
    22,755
    Likes Received:
    414
    Location:
    Toronto Canada
    TomTom Model(s):
    1535 LIVE; Via 1605; Go 50; Go 520
    Try support, Steve:

    [​IMG] United Kingdom
    02079 490 134
    Monday - Friday: 9:00 a.m. to 5:30 p.m.
     
    dhn, May 20, 2018
    #2
    1. Advertisements

  3. SteveW10

    SteveW10

    Joined:
    May 20, 2018
    Messages:
    3
    Likes Received:
    0
    TomTom Model(s):
    7150 Truck
    Thanks for the reply, I don't think support are going to help with repairs suggestions. They'll just want £200 to repair It!
     
    SteveW10, May 20, 2018
    #3
  4. SteveW10

    dhn Moderator

    Joined:
    Oct 1, 2007
    Messages:
    22,755
    Likes Received:
    414
    Location:
    Toronto Canada
    TomTom Model(s):
    1535 LIVE; Via 1605; Go 50; Go 520
    Try googling 'SatNav repair shops in the UK" then..........
     
    dhn, May 20, 2018
    #4
  5. SteveW10

    canderson Moderator

    Joined:
    Dec 28, 2007
    Messages:
    10,412
    Likes Received:
    153
    Location:
    Colorado, USA
    TomTom Model(s):
    GO720 GO 740 GO1535 GO1605 VIA1535 GO 600
    I suppose there are three questions involved:

    1) Is the source voltage adequate?
    2) Is the battery impedance so low that it is pulling down the charging circuit such that you're getting an abnormally low reading? (I should suspect the battery would be a bit warmer than normal, too!)
    3) Is the battery charging circuit just no longer working at all, or certainly not regulating to a 4.3V level?

    Separating #2 and #3 is most readily done by swapping in a new battery pack. Observe it's voltage and then see if it drops during operation with an external supply. If so, you've got #3... not good. If life improves, you had #2.
     
    canderson, May 21, 2018
    #5
  6. SteveW10

    SteveW10

    Joined:
    May 20, 2018
    Messages:
    3
    Likes Received:
    0
    TomTom Model(s):
    7150 Truck
    Thanks for your reply, it was a very sudden issue. Literally overnight it stopped working. I'm only getting 2.85v at the battery with and without the charger plugged in. No power is making it through the charging circuit. I have tried different charging leads, mains and car. Nothing is getting through.

    Got a feeling it could be a lost cause. But still worth a try before condemning an expensive item!
     
    SteveW10, May 21, 2018
    #6
  7. SteveW10

    canderson Moderator

    Joined:
    Dec 28, 2007
    Messages:
    10,412
    Likes Received:
    153
    Location:
    Colorado, USA
    TomTom Model(s):
    GO720 GO 740 GO1535 GO1605 VIA1535 GO 600
    Indeed. Would hate to bin something that costs that much. Still, 7 years of regular use on a nav device is pretty good.
    Prior models have been known to take out a diode in the charging circuit. One would have to inspect the board to see if there was some indication that this has happened on your unit. If you're game, look for a charred part with a number like D1 or D2 or D3 on the silkscreen. If you spot something, and are either handy with a soldering iron or have a friend who is, you might be able to resurrect it for the price of a 10 penny diode.
     
    canderson, May 22, 2018
    #7
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.