The is a motherboard schematic manufactured by Compal (internal codes CSL50/CSL52) primarily used in HP 15-bs and 15-bw series laptops. Key Technical Specifications
: Supports internal eDP for the laptop panel and external HDMI 1.4 (up to 297MHz) or CRT/VGA via a translator chip (RTD2166). USB Support : Includes USB 3.0 (5Gb/s) and USB 2.0 (480Mb/s) ports. or a detailed power sequence diagram from this schematic?
Before applying power to a damaged board, switch your multimeter to diode mode. Connect the red probe to ground and the black probe to the major inductors (coils). Compare your readings to known working values to isolate short circuits without injecting voltage prematurely.
If you are dealing with a specific fault on your , please let me know what behavior the motherboard is showing (e.g., completely dead, fan spins but no display, power light blinks) or what voltage readings you have found so far . I can provide targeted pinout diagnostics and trace testing steps to help you isolate the problem. Share public link la-e801p rev 2.0 schematic
Without +3VALW , the laptop will appear completely lifeless. The power button will show 0V instead of its normal 3.3V resting state. 3. The Run/Suspend Domain (Memory & APU Core)
Are there any turning on when you connect the charger? I can guide you step-by-step through the testing procedure.
: The schematic details the step-down converters responsible for these standby voltages. Lack of 3.3V on the power switch is a primary diagnostic step for non-responsive boards. Discrete Graphics Conversion The is a motherboard schematic manufactured by Compal
[19V DC-IN] ──> [VIN (19V)] ──> [+3VALW / +5VALW] ──> [EC KB9022 Powers On] │ [CPU Core Rails] <── [RAM Power (+1.2V)] <── [Power Button Pressed (EC_ON)] │ [PLT_RST# Released] ──> [BIOS Code Execution] ──> [System POST / Video Out]
models. This revision typically features Intel's 6th or 7th generation "U" series processors (Skylake-U or Kaby Lake-U) paired with DDR4 memory. Key Specifications & Architecture Processor Support : Supports Intel Skylake-U Kaby Lake-U 15W processors with integrated PCH. : Dual-channel DDR4 SODIMM slots supporting up to 2133MHz at 1.2V. Graphics Options : Integrated Intel graphics. Discrete (DIS) : Supports dedicated GPUs like the AMD Radeon R17M-M1-30 R17M-M2-50 with up to 4GB of GDDR3 memory. I/O Connectivity
Look for the EN (Enable) signal for the missing rail. If the controller has power but no Enable signal, the issue lies further back in the logic sequence (often the EC or PCH). Conclusion or a detailed power sequence diagram from this schematic
Before diving into the schematic, you must understand the voltage sequence. The LA-E801P typically utilizes several primary power rails:
Controlled by a dual-channel step-down PWM controller (often a variant like the SY8286 or similar RT-series controller), these rails must be present immediately after connecting the power adapter, even before pressing the power button.
If +3VALW is missing, the laptop will appear completely dead and will not respond to the power button. +1.2V / +1.2V_DEEP (RAM Power Rail)