For the most part, a monitor is usually good for up to about 5 years if kept in a dry place and ventilated well. I keep a fan on top of mine to increase air flow inside the unit. Heat is any electronics worst enemy...keep it as cool inside and it will last longer.
Read a little at the following URLs...may be something here for you.
http://www.repairfaq.org/ (enter monitor in the search box)
http://www.repairfaq.org/REPAIR/F_Repair.html