I got 9 boards designed and soldered. The designer tested them and they worked fine. Strangely, after I received them 7 board out of 9 are not working. I found that on faulty boards voltage regulators are outputting less voltage as expected. So, I guess the problem is around power distribution. Your task is diagnose the problem and propose a firm solution, to avoid this problem in the future. You need to test your solution on existing board (by repairing it) and if it is working, than you need to modify schematics, board file, order new pcb and solder components.
The board is controlling 3 stepper motors. It has 50 unique and 136 overall components soldered. Schematics are attached.
技能： 电路设计, 电機工程, 电子, 微控制器, 印制板布局
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