Answer to: LCD Backlight no longer works?Make sure to check all connections. Specifically you should see a small board about 1.5"x2"(? in PCs a .5"x6" board is typical) with some mention of "High Voltage". This is the inverter for the CCFL (Cold Cathode Florescent Lamp). Sounds like it isn't plugged in.
Answer to: Backlight on LCD not workingyes, it will be replaced, but it would be sad to pay that much if you could replace a couple LEDs or similar. If you do replace the displace assembly I would be more than happy to acquire your old one for the touch screen component if nothing else.