By Aashu, owner of Stitch Partner, a store for sewing machine control boards and spare parts in India.
Check the pedal, wiring and power supply first, since a loose connector can look like a dead board.
Note the code printed on the old board, the machine or motor brand and model, and the connector layout. Boards from different makers can look alike but wire differently, so match the code and the connectors, not only the size.
Delivery across India, with cash on delivery available.