Integrated Platform Controller Hub (PCH) within the CPU package. Super I/O Controller: ENE KB9022Q D. Architecture and Power Sequence
: May feature UMA (integrated) or discrete AMD/Radeon graphics depending on the specific model variation.
The charger inputs voltage via the DC jack, passing through protective reverse-polarity diodes and input MOSFETs controlled by the charging IC (often an Intersil or Texas Instruments chip). lae791p rev 20 schematic diagram verified
, including BIOS and EC firmware which are often needed alongside the schematic for full repairs. Repair Context
The LA-E791P Rev 2.0 (often referred to under the Compal project name CSL50/CSL52) is a specialized motherboard schematic primarily used for repairing and diagnosing HP 250 G6 and HP 15-BS series laptops. For a technician, a verified schematic like this serves as a definitive blueprint of the system’s electrical architecture, detailing every component from the CPU to individual resistors and capacitors. Hardware Architecture and Components Integrated Platform Controller Hub (PCH) within the CPU
Most repairs begin here. Look for the . If your board isn't charging or turning on, check if the 19V rail is passing through these gates. The verified schematic will show you exactly which pins on the Charging IC (e.g., ACDET, REGN) need to be active to "open" the power path. 2. The 3.3V / 5V Always-On Rails
If a main rail is shorted, use a DC laboratory bench power supply to inject a safe voltage (e.g., 1V on a shorted 3.3V rail) with a current limit. Use a thermal camera or isopropyl alcohol to identify the component that is overheating. The charger inputs voltage via the DC jack,
Check that the EC_RST# signal is high (3.3V), allowing the Super I/O to function.