Hardware New 3DS (no XL) boot issues

[SpikeySST]

A while back ago I decided to switch out the motherboard of my new 3DS due to the old one having several connector latches broken off. However upon plugging all of the cables into the motherboard and turning it on, there is a blue LED light that appeard as usual but both screens are black and there is no audio, there isn't any backlight either. The LED light stays on until I press the power button a couple of times for it to shut off, so I don't it is an issue relating to anything in the top section of my 3DS (considering that Ive checked cables and they are all in tact). The motherboard also does not have its charging port soldered onto it correctly (it was sold that way) so it also won't take a charge. I'm thinking that if I just replace the charging port on the new motherboard with the old one it could solve the charging issue but I'm not sure if there would be more issues with the motherboard after the process. Any help is appreciated.

 

[IAteYourNAND]

HMMM did you try to take out microSD card then boot?