Hardware 3DS XL Black screen

Zeffog

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Hello, i recently bought a Old3DS XL that boots to a black screen. I've opened it up tried to replace the wifi card to no success, removed the motherboard and reínstalled all the ribbon cables, no signs of water damage or short-circuits, but i did notice a screw was missing and some of them were stripped. The only sign of life is the blue light when i turn it on and the fact that if you try to flash ntrboot it loads the Safeb9sinstaller does half the checks and then shuts down. This also happens if you replace the boot.firm with godmode9 or luma. I believe this could be a problem with the software or NAND but have no way to confirm this. Anyone that could figure this out?
 

MrMcTiller

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Hmm.... Have you tried to look at/around the NAND? Maybe something is broken. Look for any signs of broken fuses and things like that.

--------------------- MERGED ---------------------------

I see the ''checks completed'' for a brief second and then it instantly turns off.
Also, here is a guide to replacing the motherboard. Use it to take it apart and put it back together. I know you said you already did it, but sometimes you have to do things a couple of time. https://www.ifixit.com/Guide/Nintendo+3DS+Motherboard+Replacement/6017
 

Zeffog

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I don't see signs of blown fuses, but there is a small see through white ribbon cable right next to the catridge slot that seems to have been bend or snapped, but it is still attached.
 

Zeffog

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It doesn't let me upload a image but it's just a straight line through the ribbon cable looks like it's bend
 

Zeffog

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IMG_0030[1].JPG
IMG_0029[1].JPG



It's pretty hard to see, it's the line that cuts through the black lines.
 

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