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MacinPosh

ProFile won't spin when connected to controller board

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I recently acquired a 5MB ProFile drive in an unknown condition for use with my Lisa.  

I promptly replaced the power supply caps in hope that the drive would be operational.

Powering the system on resulted in a high pitched whine but nothing else, but when I disconnected the internal data cable between the controller board and the hard drive, it did begin to spin up.

Any suggestions on what to try next? I've tried reseating all the chips. Are any particularly prone to failing?

Is there any way to narrow down whether the controller board or the drive analog board is at fault?

 

 

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