This sounds like a issue with where the wires go into the motor, especially if it’s older Hub motor. The wires got chafed and are shorting out at that area or the steel spring is doing thing into the motor wires, or there is a burnt wire somewhere and it’s shorting out the fuse. Some disassembly to get to the controller may be necessary. Unplug things one at a time. Use tape to colour code wires so no confusion. Tell me what led up to this situation. Did you drive in rain or took a big hill, etc.,??? Inspect wires and for burnt connectors as this happens when the connections are weak from the elements of corrosion.

Please give feedback to whatnresolves your issue and more info on bike and battery type.

Check the connectors especially going to motor, follow it back from there.

Look at where the wires go directly into motor look for frayed wire as in some motors there is a steel spring wire that goes around the wires to protect them. Sometimes this spring wire cuts into the wires, look for that or a damaged wire at this location.

We need to know more info like the type of motor, type of plug to the motor or how many wires go into the motor.

Do you get any signs of life, eg does the display come on but you get no power to motor, the brake lever could be pushing against the switch inside it and telling the controller that the brake is activated. You may have to find the controller and decipher which wires go to brake levers and disconnect for testing purpose. If you drive eBike in rain all plugs connectors especially lower on the bike would be suspect of corrosion and separation.

please give feedback for what works for you to fix it.

Hey guys, with these older models Do Not interchange different colored LVDS cables. Note the connector here is gold, do not use a silver connector on a gold one or vice versa. I fried a logic board this way on an A1278. Note that the core i7 lvds connector is different than the core i5.