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We specialize in dc power jack repairs on laptop computers. DC power Jack on the laptop is also known as an AC DC (direct current) power port, dc power input, laptop dc power connector, dc power socket, laptop prong, receptacle part, it is an inside piece in the laptop where the dc power plug (tip part of your AC adapter cable) plugs into.
Basically, if your laptop battery is not charging anymore, you have to wiggle or jiggle the plug and dc connector constantly to make the system work because the piece inside is loose, the screen flickers, then it is probably the dc power jack issue. If the laptop is at the point where it does not power up anymore at all then the jack is completely broke.