Using an 19V adapter to power the MB without connecting the battery,when the adapter is turned off and its output voltage drops to around 3.6V, the charger's VSYS has no output but the LDO output is normal when the adapter is power back on.
Another issue is that when the input voltage of BQ25723 drops,the Vsys voltage starts to decrease after only dropping by less than 2V, as the picture shows blow.
