Replacing the back light?
Are you sure that is the problem?
I didn't see any display with a broken back light. It's more likely the inverter driver is the issue. A back light is assembled with the display and it's really difficult to replace it.
If you confirm that is the inverter the problem, here is a link that explain how to fix it: http://josepino.com/?howto-repair-dell
Good luck
Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Replacement board: http://www.lcdrepair.us
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