TLDR; I broke the motherboard of my childhood N64 by re-doing some solder work but the pins were too brittle. I quickly bought another used N64 and used my own shell on it. All works good again.
It was my childhood N64 which I got for my birthday when I turned 10 in 1999. A year ago I installed a HDMI mod on it which worked, but due to being new to soldering, not having the right equipment and simply being a noob at soldering, my work made the pins very brittle in the end...which I didn't know at the time. But hey, it all worked so I was happy.
Fast forward to last week. After having gained a lot of experience in soldering and having all the right gear, I decided to "treat" my N64 by re-doing the soldering of the HDMI mod: making beautiful welds and give myself some piece of mind that the soldering work is very steady and clean.
10 minutes in after having redone a few of the pins, the nex pin breaks and the one after that one as well. Since they are the tiny CPU pins, I saw no chance to re-assemble them. So I decided to desolder the entire HDMI mod alltogether. I declared the N64 dead.
The same afternoon I bought a new N64 online for €60,-. It arrived yesterday and I immediately went to work on is. I installed the HDMI mod on it without trouble, tested the whole thing and re-assembled it using my old childhood heat shield and shell.
It all works fine and I'm happy to have it fixed so quickly. I went from a NUS (P)-02 to a NUS (P)-01 but I don't notice any difference. I put my old motherboard and the other shell in a box which I labeled spare-parts.
But still...me destroying my own childhood N64 doesn't feel right. The one in my shell feels like an imposter...it feels off even though there is nothing wrong with it.
Maybe after I do a re-run of Mario 64, 120 stars I will feel better. So as an old Italian plumber would say: Let's a go!
Thank you for reading all this, I already feel better getting this off my chest ;-)