Help Required TomTom Go Live 825 - Device Too Warm?

Captain Jack

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Hi,

My girlfriend's TomTom Go Live 825 is experiencing some issues with charging - in that it won't. Every time it's plugged in, it just says "Charging paused - device too warm". It doesn't matter how cold it is (outside ambient temperature is about +5C), it always says that. It does it from the cigarette lighter socket as well as from a PC.

I've been advised that it might be a thermistor somewhere inside the device - does anyone know where it might be? Is it on the board or part of the battery?

Took it all apart and found what looks like an SMD thermistor (arrowed). But... this is a guess.

IMAG0463.jpg IMAG0462.jpg

There are no markings on the silk screen next to this component other than S1 and S2 nearby, which can be seen from the pictures.

TomTom are being less than useless. The device is just out of warranty and are asking 105 Euros for a repair. What's making it worse is that they are refusing to refund the Live service subscription that my girlfriend very recently renewed and cannot use due to empty battery. For some reason, it won't work even if the device is running on external power (no choice here!).

TomTom devices seem so poorly made. Last year, her 820 blew up in a puff of smoke (literally). A zener along with a capacitor simply blew up. This is the reason she bought this new one, which lasted just over a year. I repaired the old one by replacing the blown parts (SMDs don't make it easy), which I was using successfully until recently.

Any ideas?
 
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smoggy07

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Does it do that the second it's plugged in or does it start up and then after a minute or so?
As you have it in bits, try and power it up without the battery connected, it could be the battery is shot, does it bulge out in the middle or is it sort of soft to touch under pressure?
 
Captain Jack

Captain Jack

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It does it straight away. Someone did say that it could be the battery... The datasheet for the Broadcom 59040 power management chip (which manages the charging of li-ion/lipo batteries) says it supports on-battery temperature monitoring - that's where the temperature sensor should be (which is almost certainly to be in silicon, speaking to the 59040 over i2c, not a discrete component).. We'll see.
 
2cvbloke

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Have you tried the Jeremy Clarkson toolkit yet? :D
 
Captain Jack

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I don't think the SWMBO would be impressed with those kind of efforts!
 
Channel Hopper

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Does it work as a sat-nav when plugged in ? If so, keep using it until it dies.
 
Captain Jack

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Yes but not live services
 
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