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

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A concise diagnostic note for the Compaq CQ61 reported by : the screen goes black whenever the AC adapter is connected. The thread already points to several useful directions — on brightness/power-profile behavior, on using an external monitor to separate display vs backlight issues, and on possible power-IC faults. The checklist below orders quick, safe checks first and then moves to deeper isolation.

Basic isolation: boot from battery only, then from AC only (battery removed) and observe LED behavior and whether the BIOS/POST splash appears (common BIOS keys include Esc, F10, or F2). A bright-flashlight test in a dark room can reveal a faint image if the panel is working but the backlight is not. Reseating memory modules and disconnecting nonessential drives are low-risk steps that can rule out simple faults.

Further isolation: connecting an external monitor separates motherboard/GPU failures from the internal display assembly. If external video appears while the internal remains dark, attention should focus on the LCD cable, the inverter (for CCFL panels) or the LED driver/backlight and its cable. If both outputs are blank, verify the adapter output with a multimeter and inspect the DC jack for looseness; persistent failure despite a good adapter commonly implicates the board power stage or charge/power IC. Opening the chassis and probing voltages requires ESD precautions and basic tools; professional repair is advised if experience is limited. Useful diagnostic notes to keep: whether a flashlight shows a faint image, whether an external monitor shows output, and whether behavior differs on battery versus AC.

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Member Avatar for Xyzyxx

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.

Member Avatar for fantasma1

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

Member Avatar for Billy Bailey

it could be the broken IC power on ur compaq.

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