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Lenovo 300S-14isk notebook battery and adapter cannot be serviced at the same time
Check the main power supply of 24780. According to Manual 24780, the output of 24-pin REGN 6-V linear regulator is provided by VCC. The LDO is active when ACDET is higher than 0.6V and VCC is higher than UVLO. After changing PR4413 to 10 ohms, the fault was eliminated and all problems were solved.