White screen, how to check with multimeter

Hello.

As some other users, I did all the soldering but when I plug the USB charger, there is a blink and then a white screen. My display solderings look good to me, but I’m not sure.

I have a multimeter. I looked for tutorials on the net on how to check if a soldering is OK or not, but I found nothing, or really complicated videos (and I’m really a noob). So is there a simple way to check each soldering ? Where should I plug the black and red wires of the multimeter to check ?

Thanks for the answers !

Have you checked the screen itself. Or the power cable your using?

Yes, I tried with another cable and it changed nothing. Screen turns white, and that’s it. As for checking the screen, I don’t know how to do that.