Ive got a cube stereo pro 140hpc with speed box 3.0 installed. The bosch display wont turn on.

[Adlay1er]

Ive got a cube stereo140hpc with speed box 3.0 installed. The bosch display wont turn on of even light up. What could the problem possibly. The powertube is fully charged so is the bosch display but stil wont turn on. I bought this bike off facebook market place. Can someone help me troubleshoot this problem. I spent good money on this bike i hope I didnt buy a lemon....

View attachment 20250625_014741.jpg View attachment 20250625_014734.jpg

 

[Paulquattro]

Welcome

Derestricting

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[Stihldog]

Welcome to the forums.
Cheers.

What year is the bike?
I only see a few red-flags here.
1-Used EMTB
2-Facebook marketplace.
3-Installed speed box.

Did you have the serial number checked with a local bike shop or police? Uninstall the speed box before you take your bike to a reputable local Bike Shop for service or diagnosis.