Is the welcome post with links to a laptop repair book. Among the pages is how to check out the backlight. This is NOT considered user serviceable for many reasons. Mostly because the voltage is lethal to most folk. But if you must, and accept the risks you can try replacing that part.
I have an Acer Aspire 5734z, and the screen went out on me a couple of days ago.I know my computer is on because it boots up fine and i can hear the fans and everything running. I'm currently connected to my tv via vga to hdmi. The screen on my laptop isn't completely dead, i can barely (that's an understatement) see my items on my screen. I just bought a new battery and tried to see if that would fix it but it sill no back light. Any suggestions, or fixes to this problem will be well appreciated.