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one could assume that a break in the power circuitry would cause erronious power meter readings but I've never seen a schematic of the circuitry nor do I know how the physical circuitry relates to bios and software control of power. All I know is that there are three solder points on the jack-one is ground, one to switch and one to the charging circuitry and even that is an assumption because the third connection could be a part of the polarity protection. Since your laptop charges the battery and you can only run off the battery-it seems likely that only one of the solder joints is broken
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