The toshiba L555 laptop is just the L505 but with a larger 17" screen. It also uses a different power plug than the L505.
The customer reported no power to the laptop and suspected the dc jack. When I initially plugged it in it didn't feel overly loose or broken. I couldn't get it to power on off of AC or battery power.
The L555 notebook needs to be completely taken apart and the motherboard removed to access the dc jack.
It uses a cable style dc jack but unlike many other Toshiba laptops it's soldered directly onto the motherboard vs. being plugged in.
It has four solder points that need to be properly de-soldered and a new jack soldered on. If you don't have the proper skills or tools this is something you shouldn't attempt.
Once replaced the laptop works like new again!