Hi, I would like to repair a friends e-bike (and in the mean time learn a bit about e-bikes). I've got some basic knowledge about electronics, but I'm certainly no expert. So if anyone can give me some advise how to get started ...
I know there's been a short circuit in the connector between the display and the controller (and I have the impression that somehow the battery is connected directly to the display??).
I've connected the display's wires one by one omitting the connector and it gives an error 30 (Abnormal Communication, supposedly). I also think that the display warms slightly when the battery is connected.
Now, I'd like to find out whether:
1) the display and/or the controller is/are broken?
2) if I need to change the display, do I need exactly the same or are there compatible displays?
The display is a King Meter J-LCD (http://www.kingmeters.com/project/j-lcd-display/
On the controller's print there's a serial number: LSW6G-96A-1-111117 (and a date 2011-11-17)
There's also a label on the controller's housing, which is only partially readable, it says:
Controller for brushless ...
rated voltage 36V
maximum current 10A(?)
rated current 6A
low voltage protection 31...
throttle adjustment voltage 1.2 - 4.4
product number 781-22-5 X130H(?)
ex factory date ...
I measured the cables connecting the controller and display, motor, brake sensors and battery and at least they seem to be alright.
I found an e-book "build your own electric bicycle" (Matthew Slinn) which seems to contain some information on measuring a few things in the controller. So that's what I plan to try next, but any tips and hints are welcome.