The RT8223 needs EN1 and EN2 (pins 3 & 4). The schematic shows these come from the EC via S5_ENABLE . If missing, the EC is not booting.
Pin 8 ( VREG3 ) should output 3.3V. Pin 17 ( VREG5 ) should output 5V. If these are missing, the IC is dead. la-9413p rev 1.0 schematic
Introduction In the world of laptop motherboard repair, the silkscreen code on a PCB is the first clue to unlocking its secrets. One such critical code is LA-9413P Rev 1.0 . This board is widely known as the primary motherboard for several models of Compaq and HP laptops, including the Compaq Presario CQ45, CQ58, HP Pavilion G6, and HP 1000 series. The RT8223 needs EN1 and EN2 (pins 3 & 4)