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Original post by: donmoron ,


I serviced dead backlight issue last week, more on that here:

there are three types of voltages going in the inverter- 24V DC main voltage, backlight ON/OFF signal (I refer that as backlight-enable in the post on macrumors forum) that should be 2-5.5V DC to get the backlight, and Backglight-intensity voltage (on the inverter pcb marked as VBR) that should be between 0-3.3V DC. check these and tell us your measurements to trace down the problem.