No I didn't try installing my screen in my wife's TP, but I have disassembled and reassembled mine three times now (plus once with my wife's TP parts) - though I actually didn't replace just the LCD - I used the entire assembly that's connected to the LCD (the lcd, digitizer, and casing - here is the front
and back
).
I can't actually figure out how to get the LCD itself out of the casing...the service manual completely skips over actually removing the LCD (as far as I can tell). It's totally plausible that there is a loose connection somewhere, as you've suggested, but I have disconnected and reconnected everything that I can get to. I suppose it's possible that there are one or more additional connections that are obscured from my vision from Any hints?