Why won't these PSP's turn on?

In this video I attempt to fix two Sony Playstation Portable (PSP) units that won't charge and won't power on.
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Tools I use in this video (or related):
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‣ Soldering Iron - https://amzn.to/3IoqgyQ
‣ Soldering Iron (Budget Option) - https://amzn.to/3vI1O6c
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‣ Solder Wick - https://amzn.to/3c6rTVK
‣ Plastic Pry Tools (spudgers): https://amzn.to/3PPHeJa
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#fantasticquack #quackfix #retrorepair #videogames