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If the backlight voltage is missing either
A. something is shorting it and causing the power supply to shut down that voltage for safety, or
B. the power supply is defective, and needs replacing.
To find out whether it is A. that is the case, try disconnecting all loads from the backlight voltage, and see if it springs up again. If not, then (B) is the case most likely. (In which case check all fuses in the power supply before replacing it as a whole.)
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So I did not try to provide one.
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