Hi,
I am reparing an hp41cv. The "2" key was missing strokes. I took the 41cv apart and everything inside looked fine (its a fullnut but its posts were not cracked). Next I removed the lcd (de-soldered) and sonicated the keypad for about 1 hour in 39C deionized water. Then I let the keypad dry by placing it on the top of my computer monitor for 4 days.
Upon complete re-assembly the 41cv does not respond. So I replaced the keypad/display with a spare keypad/display from another 41. With the spare keypad display everything works so the problem is in the original keypad/display.
Any thoughts? What could have gone wrong? I was very careful when I removed/replaced the lcd and made sure all the solder joints were continuous with a multimeter. Is it possible there is still water causing shorts?
Thanks,
Andy