HP 7090A Measurement Plotter - LCD Segment Test

I grabbed a Huzzah32 to hook up the LCD and test/identify the segments - Here you can see that some segments come through nicely and some are faint. I'm still not convinced that the issue is with the LCD itself, not the MC145000P controller chip. Anyway, I now have an XLS with the segments in it so I can start working on reading the data from the plotter before moving on to displaying it on a new display.

[@miggy420]

nice

[@tgsoapbox]

Thanks - I'm torn between this being an issue in the LCD display or the controller IC starting to fail - the failure mode that I think is happening with the IC (assuming that it isn't the LCD) is that when multiple segments are turned on, the controller can't supply enough voltage/current - I might just have to cough up the $25 to buy the IC from one of the more reputable old IC suppliers - there is zero chance of buying the LCD unless I find someone selling a 7090A for parts. Failing getting the actual HW working then the next steps are to capture the values coming from the plotter and then just drive a new display to show the info (which then leads to the need to find a display that more or less fills the hole in the plotter case).