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Why is my monitor not going on

So I accidentally plugged in a 19v output cable and my monitor needs 12v and down and I don't want to replace the whole motherboard dose anybody know were it fuses are at

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That 19V input may have taken out the input fuse, protection diode, or voltage regulator. I wouldn’t assume the motherboard is dead yet.

Look near the DC input jack for a small fuse marked F1/Fxxx, and check the area for a blown protection component. With a multimeter, check whether 12V is reaching the board after the fuse.

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Do you know what it would look like

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