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I have tried different display unit and cable, did not help. Looks like it is in motor side. Are you able to buy controller board separately? How to diagnose that?

Hello, I have a bike with Yamaha PW-SE motor. Motor will not power on. Display flashes all segments as long as power button is pressed. Like this So far what I have tried: -different battery and cleaned connectors -measured that all cables are good -opened motor and checked all connections...