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I wouldn't say that you proved the pcb to be bad. Here are some possibilities:
1. Steering wire leading to the positive terminal on the pcb isn't making contact.
2. Steering wire leading to the appropriate left/right terminal on the pcb isn't making contact.
3. One of the steering coils came unglued in the front end of the car.
4. One of the steering knuckles, or something else integral to the steering sytem, has a nasty gash in the plastic, thus preventing the steering from working properly.
5. You have a short in one of your controller buttons.
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