I've fixed a couple of them, and have a few dead ones in my junk box. If you're installing the single board unit, you have to be aware that you can NOT use chassis ground for anything but the buffered serial data signal and of course the board power. The ones I've fixed have had a blown bridge rectifier right at the power input from grounding the wrong pin. Don't know what happened to the dead and remaining dead ones, but they didn't have the bridge issue.
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