So just updating everyone on the situation, I inspected the flex ribbon power cable, cleaned it with isopropyl alcohol, the problem continued, I solved it then by inspecting the Switch motherboard, I took the motherboard out and cleaned everything with isopropyl alcohol, looked the welds and they are all good, I looked at the board to see if I could identify anything missing and I didn't miss anything. And I'm thinking that the problem is not the flex cable, but something on the board that I couldn't identify, for me it's all there.
The only thing wrong with my solder is that when I soldered the 3.3V wire to the capacitor, the solder ended up sticking and joining the other capacitor. As you can see in the photo.
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I wasn't worried about it because I had seen a video on the ModzvilleUSA channel! where he joins the two dots and he said no problem.
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Do you think this could cause any problems? I tried to separate it but I couldn't.
I also looked at the flat cable connector with a microscope to see if there was anything making a jumper, and by the photo it is clean.
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Well, I think I'll leave it like this, the only inconvenience is that every time I load ATMOSPHÈRE I'll have to click on Launch with the Volume + key pressed and when I want to decrease or increase the volume I'll have to do it through the Joy-con home button.
If anyone else here has any more tips or know what is happening and can help me I would appreciate it.
Thanks.