Kb926qf Datasheet Link -
| Signal Name | Function / Description | | :--- | :--- | | | Controls LCD brightness. Sent from EC to the LVDS interface. | | BEEP# | EC alarm output. Drives the PC speaker (system beep) to alert the user. | | EC_FAN_PWM | Regulates fan speed. The FAN_TACH signal is used to monitor and detect fan RPM. | | ACOFF# | Adapter power path control signal. Switches from adapter to battery when needed. | | BATT_TEMP | Battery temperature monitoring signal, sent from the battery pack to the EC. | | BATT_OVP | Battery over-voltage protection, disables charging if the voltage exceeds ~13.5V. | | ADP_I | AC adapter detection signal from the charging management IC. | | NOVO# | Signal triggered by pressing the special 'OneKey Recovery' button (specific to Lenovo designs). | | PCH_TEMP_ALERT# | Over-temperature alert signal sent from the PCH (Platform Controller Hub) to the EC. | | DAC_BRIG | Another LCD brightness control method. Works alongside INVT_PWM for precise dimming control. | | IREF | Charging current limit setting. This signal from the EC controls the maximum current the battery can draw. | | CHGVADJ | Charging voltage adjustment setting from the EC to the charger IC, controlling per-cell voltage. | | USB_ON# | Power enable signal for USB ports, controlling +5V delivery to USB connectors. | | SUS_PWR_DN_ACK | Acknowledge signal from the PCH indicating its standby power is ready. Crucial for proper startup sequencing. | | TP_DATA/CLK | The I2C-like bus used for communicating with the trackpad (TouchPad). | | EN_WOL# | Enable signal for the LAN (Ethernet) chip, often used for 'Wake-on-LAN' functionality. | | LPC_AD[3:0] | LPC bus address/data lines for communication with the main system CPU (PCH). | | LPC_FRAME# | LPC bus frame signal that indicates the start of a new cycle. | | SERIRQ | Serialized interrupt signal used on the LPC bus. | | PCIRST# | PCI bus reset signal. The EC may monitor this to know the state of other devices. |
Specific keys fail, the keyboard types erratic characters, or the trackpad drops connection due to failing internal matrix scanners. kb926qf datasheet
The limited available KB926QF datasheet pages can be found at , DatasheetMeta , Nikkoe.com , and Utsource . Additionally, the ChinaFix.com forum contains a dedicated thread titled "KB926QF EC引脚信号详解" (Detailed Explanation of KB926QF EC Pin Signals), which is one of the best resources for understanding the actual function of each pin. The Coreboot Mailing List also includes discussions about reverse engineering the chip. The LaTeX-Projects page for the Toshiba AC100 also mentions it, linking to the broader Linux kernel community's efforts. General laptop Service Manuals for models like the Compal JHL90 or Lenovo G460 often contain excellent documentation on the EC's firmware, as mentioned in the coreboot archives. | Signal Name | Function / Description |
This article compiles all available public information on the KB926QF into a unified technical reference, consolidating data from partial datasheets, reverse-engineering from service manuals, and community-based laptop repair forums. Drives the PC speaker (system beep) to alert the user
