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Generated by the SY8288C regulator. Powers secondary standby devices and USB ports. 3. Run and Suspend Rails (S3/S0 States)
Low resistance (below 1-2 Ohms) on a 3V or 5V rail indicates a severe short-circuit.
Rev 2.0 boards have different power distribution and component placement compared to Rev 0.2 and Rev 0.3. Chinese repair forums report: "LA-7912P has multiple versions. My board is 2.0V. Does anyone have the circuit diagram? 2.0V and 0.3B have different circuits. This version is prone to board layer breaks when water-damaged" . lae791p rev 20 schematic diagram verified
Laptop works on adapter but doesn't charge the battery, or amber charging light blinks continuously.
: Always-On rails responsible for powering the Super I/O controller, BIOS chip, and power management circuits. Generated by the SY8288C regulator
Intel Core i3/i5/i7 System-on-Chip (SoC) BGA package. Memory Support: Dual-channel DDR4 SODIMM slots.
To help point you toward the exact fix for your board, let me know: Run and Suspend Rails (S3/S0 States) Low resistance
The full naming convention, like csl50 csl52 la-e791p rev 2.0 , is used interchangeably in technical forums and documentation.
Check if the KBC is sending the PM_SLP_S3# signal to wake the chipset.