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@RFPlus
Thanks, Gordon ... I'll try to track it down. I've tried another display and rewired. Tested each path end-to-end with a conductivity tester. Pulsed all pins using digitalWrite() and these appear on the LCD connector, according to my trusty HP545A probe. No shorts between pins, RW grounded. So electrically it appears sound. Now I'd like to understand which code is being called. There seem to be several functions in code/lcd.js .. is there any documentation on how/what is called? And could I try driving the display directly, using digitalWrite() for example, to troubleshoot this? ... Cheers, Jon