compaq cq61 .my laptop screen turned into black whenever i plug the battery charger please help me

Obvious thing to try, but did you try hitting the brightness controls for the screen? The computer can have two different brightness sliders for when it's plugged in and when it's not.

try conecting a monitor, if turn on can be the inverter or the backlight.i hope you can fixed.good luck.

it could be the broken IC power on ur compaq.

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