@foone
Are there any other SOT-89 chips with "J8" as datecode or something? Those would have intact markings.
Annoyingly Richtek has used "J8" for SOT-89 3.3V LDO regulators, but Richtek was likely not around when that laptop was made.
As Richtek was founded in 1998.
Seeing
It does look very regulator like, but if the 886-23255862 chip is a DC-DC controller in addition to the TL494C PWM controller already on the board.