How to diagnose No +VCC_CORE - LA- E791P Rev 2.0 - No display - SOC Problem - YouTube. This content isn't available. lalbabu.p.s.sahani
: You can find the full Rev 2.0 diagrams on professional repositories like or via repair communities on Are you currently troubleshooting a specific fault la-e791p rev 2.0 schematic
Before diving into complex logic, verify these basic rails in order. If any of these are missing, the laptop will not reach the S0 (fully on) state: : Essential for the Embedded Controller (EC) to start. +3VALW / +5VALW How to diagnose No +VCC_CORE - LA- E791P Rev 2
connections to the charger IC and battery, as communication errors here often prevent charging even if the DC jack is fine. Schematic Access If any of these are missing, the laptop
LA-E791P Rev 2.0 motherboard (commonly used in HP 15-bs series laptops), a highly useful piece of information for troubleshooting power issues is the SMBUS Address Table Primary Power Rail sequence Critical SMBUS & Power Address Table
: The enable signal from the EC to turn on the main power supplies.
If you are troubleshooting a "No Power" or "No Display" condition, checking these specific SMBUS addresses can help identify which component (Battery, RAM, or PCH) is failing to communicate: SMBUS Port 7-bit Address 8-bit Write 8-bit Read Battery (BAT) DIMM1 (RAM) Charger (CHGR) Thermal Sensor Common Power Rails to Probe