Multiple synchronous buck regulators generating Crucial Power Rails and Power-On Sequence
is a motherboard manufactured by Compal for the laptops. This specific revision is commonly referenced in high-level chiplevel repair discussions due to its prevalence in budget-friendly HP 15 series models. Technical Overview & Components
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Secondary rails that feed the RAM modules and the internal logic processing blocks of the AMD APU.
: The board creates +3VALW and +5VALW . These low voltages run all the time, even when the laptop is turned off. This link or copies made by others cannot be deleted
If the motherboard turns on, lights the status LEDs, but displays no image on the internal LCD or external HDMI:
To fix this board, you must know how power moves through it. The board needs different voltages to start up. If one step fails, the laptop stays dead. Try again later
If no direct shorts are found, plug in the original or a bench power supply set to 19.5V.
Confirm that the IC is receiving its main input voltage ( VIN / VCC ) from the +B rail.
; drops to 0V upon pressing power button. Missing authorization signal from EC or corrupt firmware.
Use a schematic from a similar Compal board that uses the same chip.