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I add to what Barbesi replied that this adapter brings the voltage divider of the TL431 into the different plugs, when changing it for HP / Acer / Toshiba / etc you also change the resistors of the splitter and therefore the output voltage.
That's why the plug connector that goes to the adapter is 4 pins.
If you can, you should see what type of regulator you use in the output if it is TL431 or any other, usually they are configured with a voltage divider and what you have to do is vary that divider to get the voltage you need, but You must be careful with the current. regards