If you need a new HP01 module, requires the original LED panel to be harvested and transplanted, otherwise a complete plug and play replacement, check this out:
http://www.hpmuseum.org/forum/thread-5824-page-3.htmlBernhard has the new board emulating the original completely. Also utilizes the original keyboard and keyboard pad. In other words, remove the old module; remove the LED panel from it; add LED panel to new module; place new module in case; add two lr44 or 357 and off you go.
Geoff