Help! TONGSHENG VLCD-5 : No speed and only one bar of battery showing on display.

Pumpalump

Finding my (electric) wheels
Nov 22, 2020
17
4
Hi folks,
Hope someone can assist.
I'm having a bit of a problem on a Tongsheng conversion I did for a friend. After riding for approx 325 miles he noticed the speed wasn't showing on the display and the battery level only shows one bar although the battery itself was showing three lights on the push button at the time?
Apparently it has done the same thing while on another ride he went on but it sorted its self out.
The assist levels are still working and the motor still gives power as normal.
I've checked the display inside for loose wires(none found), shorted the positive /negative motor terminals, checked all the connections and even tried my fully charged battery on his bike but still has the same issues.
I've also noticed the system isn't shutting down automatically if left for a time without riding.
Any ideas?
 

Attachments