I have read this is a common problem with the Lumix TZ7 so it may be a wider issue. I also read someone ordered the replacement screen on e-bay and it came with the tools to fix it (from Hong Kong of course!) and it was relatively easy to do.
Ordered a new screen off ebay and the company (some German company) even had instructional videos on youtube as to how to do it for my specific camara! Very useful and consequently took me no longer then 10 minutes to replace, and it now works perfectly.