Siemens SF65 mobile has blank white screen - Help please!

My SF65 phone (used daily for the past 10 years) has a blank white screen when turned on. This just happened a couple of days ago and as the phone was a present from my late husband, it has precious texts and photos on it. It is due for a new battery which I have ordered but could it be a hardware failure and is it repairable? I am desperate for help with this. Many thanks in advance.