F900LHD Won't Record with 12 volt Supply

[Marzipan]

I have two F900LHDs bought about a year apart. The newer one refuses to record when running off vehicle 12 volt supply.

I've exchanged cables, internal batteries, re-set it and made the menu settings about the same but when the new dash cam is plugged into the car it acts like it's plugged into a computer's USB port ... it displays a choice between "PC Computer" and "Mass Storage". (It does briefly flash a view through the lens.) It will however record with its own power.

Any thoughts on this behaviour?

 

[GJHS]

It sounds like the cables or more the pins on the cable. Different cables different uses. I imagine you tried running the non working one with the already working ones power cable?

 

[Marzipan]

It sounds like the cables or more the pins on the cable. Different cables different uses. I imagine you tried running the non working one with the already working ones power cable?

Yes I have tried a good working cable.

Since it displays the view through the lens for about a second before switching to a "computer" display I'm wondering if the camera does not see sufficient power to do a recording. When the weather warms up I'll get the engine running and revving a bit to get the voltage up to 14 - currently about 12.0 v - then plug the camera in.

 

[Marzipan]

I have discovered that the troublesome dash cam does work with a power adapter that came with a GPS but not with the adapter that came with the device nor with the adapter that came with a nearly identical dash cam - even though the other dash cam works with both adapters.

 

[irononreverse]

Get some tape and cover the two middle contacts in the USB plug. These are the data connections. By covering them up, your dash cam will just see it as a "dumb" power cable.

 

[ronnie randall]

I have two F900LHDs bought about a year apart. The newer one refuses to record when running off vehicle 12 volt supply.

I've exchanged cables, internal batteries, re-set it and made the menu settings about the same but when the new dash cam is plugged into the car it acts like it's plugged into a computer's USB port ... it displays a choice between "PC Computer" and "Mass Storage". (It does briefly flash a view through the lens.) It will however record with its own power.

Any thoughts on this behaviour?

i am having the very same problem you are having with the one i have if you find a solution to it would you please let me know.i have had this thing for 2 months and haven't bin able to use it yet.thanks.(ron062@gmx.com)