Http://download.tomtom.com/open/manuals/rider_400_40/html/en-gb/index.htm#Display.htm
There is a setting in the device that changes to night time colors automatically when it gets dark if selected. The display controls allow adjustment of brightness and change of colors. If operating by battery alone, some battery saving feature may be at work. Tom Tom support might be able to answer that question. https://help.tomtom.com/hc/en-us/articles/360013898180-Extending-the-battery-life-of-your-navigation-device
https://help.tomtom.com/hc/en-gb/articles/360013901180-Changing-night-day-colours-on-your-navigation-device
http://download.tomtom.com/open/manuals/rider_400_40/html/en-gb/index.htm#Appearance-MASTER.htm
SOURCE: Tom tom gps speakers not working.
I have had the same problem. I bought my gps used.I soon found out sound would not come out of the gps untill I taped on the back of the gps. I solved my problem. The voice coil in the speaker becomes detached. Their are 4 screws in the back of the gps once you open up the gps the speaker is attached to the back of the inside of the gps. You have to carefully detach the speaker from the back of the gps ( I used a small flat head screw driver like one from a eye glass repair kit ) then press lightly on the center of the speaker wile the gps is trying to talk (hopefully when you do this the speaker will make noise). I stacked 2 dimes in the center of the housing of the speaker then reatached the speaker to the housing thus sandwitching the 2 dimes between the housing and the center of the speaker. For my unit this put enough pressure on the center of the speaker for the system to work. Then I reassembled the gps. It was about 4 or 5 months ago and the speaker still works fine. Some times the easy solution works just fine.
SOURCE: Mobile phone won't connect to Tom Tom go 540 live
Hi, I got round this problem by pressing and holding the ON/OFF button for 15 seconds untill system reboots. Then reconnect mobile,if not delete mobile and repeat process.
SOURCE: how can I change battery on my tom tom go 730 sat
How do I change the battery of my Tom Tom 730
SOURCE: my sat nav tom tom go 530 won't connect to my
hi, make sure you installed the latest verion of tomtomhome. you can collect it at tomtom.com good luck
Testimonial: "very helpful, thanks a lot mate."
SOURCE: my tom tom sat nav wont turn on even when plugged
hi try a soft reset, first make sure your battery is full. if you use a sd card, remove it. push reset button on bottomside of your tomtom, its in the middle next to "reset" push it with a small pin, paperclip or something, for at least 15 seconds. after that push on/off button for minimum 5 seconds. if used push back sd card. good luck
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