The supply works for 5 seconds, then shuts down.
Verify that the charging IC (often an Intersil or TI chip) is outputting the proper gate drive signal ( ACDRV ) to turn on these transistors.
If you describe your or what part of the board you’re working on (power, USB, Ethernet, display, etc.), I can give you targeted guidance without needing the full proprietary schematic. Would that help?
Dedicated enthusiast forums such as the Badcaps Laptop Troubleshooting Library or VLab.su.
Power LED glows, fan turns on, but there is no POST or internal/external video display. lae791p rev 20 schematic better
Mastering Laptop Board Repair with the LA-E791P Rev 2.0 Schematic
Diagnosing and repairing modern laptop motherboards requires precise documentation. The (commonly known by its project codes CSL50 / CSL52 ) powers a widespread generation of budget-friendly yet highly capable laptops, most notably the HP 15-BS series and the HP 250 G6 . When dealing with intricate board-level failures—ranging from random power shutdowns to missing display backlights—having access to a high-quality LA-E791P Rev 2.0 schematic is essential.
Check for +19V on the current-sensing resistor directly after the input protection MOSFETs.
For high-level repairs or better documentation, you can find the full schematic on Scribd The supply works for 5 seconds, then shuts down
Locate the LVDS/eDP screen connector block ( JEDP1 ) in the schematic layout. Check for the backlight power rail ( +LED_VCC or +VIN_BLGND ), which should measure roughly 19.5V. Next, check the logic signals: BLON_OUT (Backlight Enable, ~3.3V) and VCC_EDP (Panel Logic Power, ~3.3V). If these enable signals are dead, trace them back to the source to find blown inline zero-ohm resistors or fractured logic gates.
Use your multimeter in diode mode to check the main power line for shorts. 2. BIOS Corruption & No Display
If you are working on a specific repair with this motherboard,g., completely dead, blinking LED codes, fan spinning but no image) or any you have already taken from the primary coils. I can help guide you through the exact power rail tracing steps or identify the specific component blocks to check next! Share public link
Typically paired with Intel 6th, 7th, or 8th Gen (Skylake/Kaby Lake) CPUs, such as the Core i3-6006U. Memory: Standard DDR4 SO-DIMM slots. ⚡ Key Power Rails and Common Faults Would that help
motherboard, is a proprietary engineering document by Compal Electronics . It serves as the master blueprint for the HP 250 G6 and HP 15-BS laptop series. This revision specifically details the complex power distribution and signal routing required for systems built on the Intel Sky Lake-U architecture. The Architecture: Inside the Rev 2.0
The LA-E791P is designed by Compal Electronics. It features an integrated System-on-Chip (SoC) design that minimizes board space while keeping manufacturing costs low.
To ensure you can get started with your repair right away, Share public link
+VCC_CORE & +VCC_GT (CPU Core and CPU Graphics, generated by the CPU multi-phase VRM controller) 3. High-Utility Troubleshooting for Common Failures