How to troubleshoot non-functional LCP on 5975 MSD?

The display on the local control panel (G3170-60195, I believe) on our 5975 MSD is not working.

 I confirmed ~3.3 VDC between pins 1/2 and 1/5 from the interface board (G3170-6002) in the LCP to the Samsung LCD (20T201DA2).

How can I identify the cause of this issue? I'd like to order the required replacement part, but its not clear to me how I can identify which would need to be replaced.

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