920 Works fine, then won't reboot for a while

[Mike_sp]

The title pretty well describes the main problem. I used the 920 for a number of hours, then shut it down while having lunch. When I attempt to reboot it to continue the trip or to enter a new destination or whatever, nothing happens. After allowing it to rest for a few hours, it comes back to life.

Any similar experiences? Solutions? It's about 22 months old but is only used on overseas trips.

Another minor irritation - it won't run for more than a few minute (seconds?) on the battery alone. Sounds like a dead battery. Could this be related to the above? I think I saw a description with illustrations for changing the battery on the board a long time ago. Can someone point me to that posting?

 

[canderson]

Many devices actually run off the battery connection even when plugged into an external power source. The combo of external power source and internal charger/regulator of the device are expected to produce sufficient current to charge the battery and operate the device concurrently. However, there are a couple of ways this can "go wrong".

Normally, a bad LiPo battery will develop a high internal resistance such that it really doesn't take much of a charge, nor will it draw much current as a result. However, there are other failure modes that actually increase the current draw of the battery - so much so that it pulls down the output of the charging circuit and the unit doesn't see sufficient voltage to boot.

So yes - given the very poor state of your battery, there's a better than even chance that your power-on problem is battery related.

Battery replacement info is here: https://www.tomtomforums.com/tomtom...730-920-930-battery-replacement-tutorial.html

 

[Mike_sp]

Thanks very much. Suspicion confirmed! As I'm currently traveling in Europe for three months I guess I'm stuck with buying a new unit. Just for the hell of it I'll try the new battery install upon return home giving me a spare unit to loan to visitors.