3DS won't turn on but will charge

Hi all,

I'm new in to the repairing of devices but I want to fix a 3DS that I bought from an auction site. When I received the product it would not power on, it would charge however and so I let the 3DS charge until it was full of electronic juice.

After a few days I tried to power up the 3DS and it was like a small miracle happend: It booted up. However it was quite clear that there was a problem with the Wi-Fi board. I reconnected the Wi-Fi board and it looked like the problem was solved. But suddenly the 3DS shutted down with a small popping noise. It hasn't turned on since (also no blue power on light), however I am still able to charge it.

A few scenario's were going through my head:

- The ribbon cable for the speakers broke. Personally I don't think this is the case, because the Nintendo 3DS won't even power on when the screen is almost closed.

- A fuse or capacitor has been blown on the motherboard. I cannot find any evidence of this on the motherboard. Also I think that it's strange that I can still charge the device if a fuse has been blown up. (I have opened up the 3ds and measured the fuses with a multimeter, they gave 0,05 back (on 200 ohm's) looks like me that they should be working.

- The battery is dead. This is also possible, but I find it strange that I'm still able to charge it (I have read stories about problems with the battery and that they could only charge it for a few seconds). (Put in a replacement battery, it didn't fix the problem)

- The game cartridge reader has some problems with it's connectors (see picture: https://s17.postimg.org/cf77n541b/DSC_09...

). I really don't know if this could be a problem which could result in a short circuit.

I am hoping that an expert on this forum could help me in order to sort the problem. I have already order a new battery and ribbon cable (just in case).

Thank you in advance!