Woodstock Display Problem

[BobVA]

Maybe a power supply problem? I'd check the batteries / connection (supply 2.5v directly to the battery terminals with a power supply if you can), then have a look at the 4.4v "Vdisp" voltage (you'll need to google up the schematic) and see if that's in the right ballpark. The next suspects would be one of the driver chips.

(The adjustable resistor indeed looks suspiciously like a drive current adjustment, but it actually sets the "low battery" warning level.)