Hardware Writings on the n3ds xl motherboard.

[Frieren]

My 3DS heating up when i play games. Console getting pretty warm in the left part of back side, where the CPU is located. It's not hot to burn or anything, but annoy me. I have old revision 3ds/3ds xl and they never heating up while playing. They are heated only when charging.
So, i decided to teardown n3ds xl and made some tests. Inside i found many inscriptions maded by black marker. And some strange spots with bad soldering. Pictures under spoiler:
I have many game consoles, but i never see something like this inside them. I tried to find pictures of n3ds motherboards. I find some. No inscriptions/black marker/strange spots at all.
Maybe someone faced with similar situations? Inscriptions on motherboard common for n3ds or shop sold me repaired/refurbished unit?

 

[The Real Jdbye]

I have never seen these kind of markings inside original game consoles that have not ben repaired by a 3rd party. The motherboard looks fine, nothing about it seems unprofessional, it's just the markings. Did you buy this n3DS used? Maybe it was repaired by a 3rd party.

 

[Logan Pockrus]

My 3DS heating up when i play games. Console getting pretty warm in the left part of back side, where the CPU is located. It's not hot to burn or anything, but annoy me. I have old revision 3ds/3ds xl and they never heating up while playing. They are heated only when charging.
So, i decided to teardown n3ds xl and made some tests. Inside i found many inscriptions maded by black marker. And some strange spots with bad soldering. Pictures under spoiler:

Spoiler: Photos

I have many game consoles, but i never see something like this inside them. I tried to find pictures of n3ds motherboards. I find some. No inscriptions/black marker/strange spots at all.
Maybe someone faced with similar situations? Inscriptions on motherboard common for n3ds or shop sold me repaired/refurbished unit?

This is...very strange. Have you ever sent it in for a reparation, or did you buy it used?

 

[Frieren]

Did you buy this n3DS used? Maybe it was repaired by a 3rd party.

No. New. Unopened and sealed. Thats why this situation bothered me.

This is...very strange. Have you ever sent it in for a reparation, or did you buy it used?

I had never sent it anywhere. Buy it unopened and sealed.

 

[milerwan]

All is ok, the marks are genuine and solders on power socket are genuine too.

 

[dg_dex]

Yup, can confirm what Milerwan said above. My replacement console came with same sort of black marker pen markings. No solder work like that though. But nothing to worry about OP.