A LCD (Liquid Crystal Display) operates off of heat.
Heat generated by electrical current.
They are often sensitive to heat from your finger or hand. But they recover from that.
If it is going to recover, it should do so within 24 hours of sitting at room temperture (about 74 degrees F).
The S602 is a nice camera and you can still find them advertised for about $500.
So you might give some thought to repairs.
From what we hear from people on the forum, repair prices range from $100 to $200.
You should call Fujifilm repair center and see what they say, before making a decision.
I left my poor dig cam in the sun for a few hours and the screen stopped working - it looks very blurred and is full of lines. Oops!
When it got wet previously the screen problems resolved as the camera dried out. Is this problem likely to resolve? If not, is it worth getting fixed or should I upgrade - I have had the Fuji S602 for nearly 3 years and love it.