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how do i make a laptop inverter work?


hi i am wanting to be able to run a laptop inverter off a few batterys
the inverter looks like the one in this instruclible https://www.instructables.com/id/How-to-Fix-an-LCD-backlight-power-Inverter-Using-/step8/Bridge-the-fuse-AT-YOUR-OWN-RISK/
i was wounderin what cables i would need to put power on ? i an not wanting the screen to work, just for the back light to glow, please help