The SMSC or Nuvoton Super I/O chip controls the keyboard, trackpad, fan speed, and the initial power-on sequence. Because it sits near the edge of the chassis, it is highly susceptible to liquid damage.
The 4540s has specific architectural quirks, such as the dedicated ATI/AMD graphics chip which runs hot and frequently desolders itself. Boardview allows technicians to locate the thermal sensors and the power stages feeding the GPU. Instead of blindly reflowing the chip, a technician can check if the GPU is even receiving power by probing the coils identified in the software. hp probook 4540s boardview work
Open your BoardView software and load the Quanta_T8C.brd file. You will see the green/blue PCB layout. Use the search function (usually Ctrl+F) and type PWR_SRC . The software will highlight the DC-in jack connector (likely J3 or J4). Zoom in. You will see the pinout: pin 1, 2 are positive, pins 3-4 are ground. The SMSC or Nuvoton Super I/O chip controls
Locate the two large power inductors (coils) near the standby IC. Boardview allows technicians to locate the thermal sensors