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.
A 6R15 will set you back $130 if branded as SII NE15, or even more is Seiko, since an NH36 does practically the same for $100 less then is clear why the latter is the popular choice. Have a read of the many modders topic on WUS. There must be thousands of posting and pictures, and complete watches and parts are often listed.
Actually it was my second watch joke since the movement doesn't actually have "hacking" either so the use of the word hack was obviously a double entendre with the extend usage of hack (n) being "a tip or trick for an efficient method of doing something"