Thanks for the link, I'll take a look.
Re functionality, the watch is behaving in exactly the same fashion as my very first post, although not surprising as I haven't really done anything to it other than removing the movement
Is the watch now in a functional state? Because if it's now functional then you can take it apart for cleaning otherwise I'd recommend fixing whatever the problems are.
Then if you like the step-by-step instructions at the link above which Are not exactly going to apply to your watch. Here's a variation on that in a little different format
I would assume that the watch company would have standardised the display units across a range for production, so Its take a chance picking up another Takara, If you can find one the same model spares or repair with a good screen ok, but a word of warning on that score, the display/LCD is usually the reason it up for repair so the need to check it out is paramount before buying.