Acer 5734Z lap top,how many volts should be there inverter board voltage AC or DC ?

Rondo

Rondo

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I have a black screen on my Acer 5734Z lap top, I replaced the inverter board twice the first-time it worked for 2 months now out black, I replaced it again new board and nothing yet I can see through the screen with a flashlight its working no back light so I want to check the voltage out red and white wires to the screen how many volts should be there inverter board voltage AC or DC ?:confused:
 

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