I have read this link, checked in my IDE I have this hd44780LCD library installed with the library manager.In the examples included with this library could not make out the sketch for testing the backlight control of the shield.Which sketch is it?
See the wiki: https://github.com/duinoWitchery/hd44780/wiki/ioClass:-hd44780_pinIOnote: there is a link to the hd44780 library wiki in the included Documentation which can be found in the "Documentation" sketch.--- bill
Also, why not add a transistor (t1) as shown in the schematic? It is much simpler than having to unsolder the ldc board or redo all the traces. Think a 22-100k resistor (R4) in series with the base should workV2 is the equivalent to d10