it’s hard to make out the photo solder flows towards the heat.
Video https://streamable.com/zeu6gm
Thanks for all the info so far! I'm trying some stuff but failing miselably haha
Added video https://streamable.com/zeu6gm

Help soldering disconnected cable from laptop charger
How am I supposed to soldering this? I have both soldering iron and a spool of solder. But most videos show soldering wires instead of what I need as you can see in the picture (disconeted cable on a laptop charger). I would higly appreciate any info and tutorial videos on this.

Edit: Video https://streamable.com/zeu6gm
additional internal battery
After removing the CMOS battery in addition to the main battery, an powering the laptop on it worked. After, I readded both batteries and it now continues working. Maybe I should replace both batteries to avoid that happening again in the future?
Thank you very much for your support!
Not really; when it first happened I was just using the laptop normally. Then the screen got black out of the blue. I tried turning up the brightness while the laptop was still on, but then it powered itself off. Now I cannot even power it on (yes, power cable is plugged)

SOLVED Laptop won't power up
cross-posted from: https://monyet.cc/post/815998
SOLVED
After removing the CMOS battery in addition to the main battery, and powering the laptop on it worked. After, I readded both batteries and it now continues working. Maybe I should replace both batteries to avoid that happening again in the future?
Thank you very much for your support!
Yesterday I was using my Lenovo Ideapad laptop until the screen went totally black, but it was still on as the led's light was on. 1 or 2 minutes gone by with me trying to press keys for brightness etc, and then it suddenly shutdown. Afterwards trying to turn it on again, the led will bright for 2 seconds until it shuts itself down...
I tried removing and putting the battery again to no luck.
First I thought it could be the CPU/iGPU, now maybe the battery or motherboard is the issue? I repaired this latop many times, but this is the first time this happens, so I don't know what it can be..
Apart

SOLVED Laptop won't power up
SOLVED
After removing the CMOS battery in addition to the main battery, and powering the laptop on it worked. After, I readded both batteries and it now continues working. Maybe I should replace both batteries to avoid that happening again in the future?
Thank you very much for your support!
Yesterday I was using my Lenovo Ideapad laptop until the screen went totally black, but it was still on as the led's light was on. 1 or 2 minutes gone by with me trying to press keys for brightness etc, and then it suddenly shutdown. Afterwards trying to turn it on again, the led will bright for 2 seconds until it shuts itself down...
I tried removing and putting the battery again to no luck.
First I thought it could be the CPU/iGPU, now maybe the battery or motherboard is the issue? I repaired this latop many times, but this is the first time this happens, so I don't know what it can be..
Apart from an old and low-end smartphone I'm using to wri