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Laptop Schematics Abbreviations meaning
DET Detected
DIS Detected On board graphics card
DMA Discrete Direct Memory Access
DN Direct Memory Access Negative data line
DP Data Negative Positive data line
DRAMRST# Data Positive RAM turn on signal
DRV Dynamic RAM Reset MOSFET drive signal connecteto the gate
DRVH2 Drive Voltage High This is the high side of MOSFET
DRVL1 Drive Voltage Low This is the low side MOSFET
KBC Embedded control chip on the Motherboard
# Hash tag Usually used in schematics to represent that the signal is active without voltage
@ Used In schematics to represent a component that is not installed on motherboard
3V_5V_POK @ A signal that indicates when .3.3V and 5V power are out and fine
AC Voltage from charger
ACOK indicating when the power from the charger is fine
ACPRESENT Signal that indicating that the charger is present
ADP Laptop charger
ALL_SYS_PWRGD Adapter A signal that indicates when all voltages except that of CPU is up and fine
ALW All System Power Good Voltage that is present on motherboard throughout even when the laptop is shutdown
BAT Always Battery Battery connector or power
BATLOW# Battery Low Signal indicating when battery is low, Its active when the voltage is zero
BIOS The software program that controls the turn on process of components until windows takes over
BL Back Light Basic Input and Output Software Backlight
BLKT Screen or Keyboard light
BST BST power for internal voltage regulators in power supply chips
BT Bluetooth
BTN Button
C Capacitor
CHG Charging
CLK Operating frequency Clock Connector
CN Connector
CPU Processor Central Processing Unit
CS Current Sensor Determining how much current is flowing
CTL Control signal
D Diode
D Data
DC Direct Current Voltage from the battery
DCIN Direct Current Input Where voltage from charger connector and battery is connected on the motherboard
EC Embedded Controller Embedded control chip on the motherboard
EDP Embedded Display Port Display sections like display port or screen display section
Emmc Embedded Multimedia Card A chip that acts as a hard drivein portable device like phones or tablets
EN Enable Power turn on signal
FB Feedback voltage
FREQ Frequency The rate at which current changes direction per second
GFX On board graphics card
GND Common negative plate found all over the motherboard
GPU Ground
HDA High Usually refers to sound in motherboard
HDD High Definition Audio Hard disk
IO Initiate Input or Output
KB Input or Output Keyboard
KB_DET# Keyboard This signal voltage will go to zero to indicate that the keyboard is inserted
L Key Board Detected Coil
L Inductor / Coil No voltage or zero voltage
LCD Low Screen display
LDO Liquid Crystal Display Voltage that usually comes out before laptop turns on
LID Low Drop Out Top laptop housing which contains the sensor that sense when the laptop is closed
LVDS Lid Low Voltage Deferential Signaling .v Screen power voltage
MEM Memory Usually indicating RAM
MIC Microphone
MISO Microphone Transfer of data from Bios chip to Chipset
MOSI Master In Slave Out Transfer of information from chipset to Bios chip
NC Master Out Slave In Indicating when a pin or chip is not connected on the motherboard
NTC Not Connected Negative Thermal Coefficient Temperature sensing or sensors
OC Excess current
P Over Current Power
PCH Power Chipset
PCH_SMBDATA Platform Control Hub Platform Control Hub System Management Data Chipset system management data line used for chipset to communicate with other SMBUS components like Battery
PECI Platform Environment Control Interface Platform Environment Control Interface
PG .v Signal indicating when voltage is fine
PGOOD Power Good Signal indicates when voltage output is fine
PLT_RST Power Good Main turn on signal from processor to other component on the motherboard
PM Platform Reset Power Management signals from chipset to KBC
PM_PCH_PWROK Power Management Power Management Chipset Power Ok This signal indicated when chipset power is fine
PROCHOT# Processor Hot Excessive heat at the processor, This voltage goes to zero when the processor gets to hot
PS_ID Power Supply Identification Laptop Charger middle pin
PWM Alternating signal that turns on and off MOSFETs to set output voltage for example screen dim or brightness
PWR Pulse Width Modulation Consider it as Another word for voltage
PWR_BTN Power Power button
PWROK Power Button Voltage is good
Q Power Ok MOSFET / Transistor
R MOSFET / Transistor Resistor
RESET Resistor Turn on or off signal in digital electronics
RF reset Radio Frequency Refers to wave signals like FM radio or phone network signals
RMSRST# RMS Reset Chipset turn on signal from KBC
RST Reset Turn on or off signal in digital electronics
RTC Real Time Clock 3.3V for the chipset usually from Bios battery or always power
RTC_DET# Real Time Clock Detected This signal will drop down to zero to indicate that the Bios battery is detected
RX Receive The processing of receiving information on motherboard
S0 State 0 Power state where the laptop is fully on
S3 State3 Power state where laptop is in sleep mode usually with voltage on RAM
S4 State4 Power state where laptop is shut off but plugged in either with a battery or charger
S5 State5 Power state where laptop is totally shutdown
SATA State Serial Advanced Technology Attachment Data transfer technology for hard drive and CD drive
SHDN Turn off
Shutdown The word Signal indicates a .V logic level voltage
Signal Signal State of power
SLP Sleep Serial Peripheral Interface Communication protocol used in short distance communication on motherboard, like Bios
SPI Speaker
SPK Speaker Switching
SW Switch Usually referring to motherboard
SYS System Represents temperature
THERM Thermal Touch pad
TP Touch Pad Pin point for testing in the circuit
TP Test Point A chip on motherboard that stores security passwords like for hard drive encryption
TPM Trusted Platform Module The processing of sending information on motherboard
TX Transmit U Integrated Circuit Motherboard letter indicating Integrated Circuit(IC) chips
Processor Integrated graphics
UMA UMA A data communication protocol used in USB ports
USB Universal Serial Bus Voltage
V Voltage Positive voltage input
VCC Voltage Collector Positive power voltage
VDD Voltage Drain Drain Signal indicating when RAM power is fine
VDDQPWRGOOD VDDQ Power Good Part of the output voltage that goes back to the chip to let the chip know if the voltage is out and how much voltage
VFB Voltage Feedback Positive voltage input
VIN Voltage Input Voltage output
VO Voltage Output Output voltage
VOUT Voltage Output A signal that turns on Processor power Chip
VR_EN Voltage Regulator Enable Onboard graphics chip RAM
VRAM VRAM Voltage Regulator
VREG Voltage Regulator Voltage Regulator output
VREG Voltage Regulator V Voltage Regulator output
VREG V Voltage Regulator Usually ground or negative
VSS Voltage Source Source Half of RAM volts to power part of the processor
VVT VVT Signal that restricts writing data to EEPROM like Bios chip
WP Write Protect X Crystal Oscillator Motherboard letter indicating a Crystal Oscillator
DET Detected
DIS Detected On board graphics card
DMA Discrete Direct Memory Access
DN Direct Memory Access Negative data line
DP Data Negative Positive data line
DRAMRST# Data Positive RAM turn on signal
DRV Dynamic RAM Reset MOSFET drive signal connecteto the gate
DRVH2 Drive Voltage High This is the high side of MOSFET
DRVL1 Drive Voltage Low This is the low side MOSFET
KBC Embedded control chip on the Motherboard
# Hash tag Usually used in schematics to represent that the signal is active without voltage
@ Used In schematics to represent a component that is not installed on motherboard
3V_5V_POK @ A signal that indicates when .3.3V and 5V power are out and fine
AC Voltage from charger
ACOK indicating when the power from the charger is fine
ACPRESENT Signal that indicating that the charger is present
ADP Laptop charger
ALL_SYS_PWRGD Adapter A signal that indicates when all voltages except that of CPU is up and fine
ALW All System Power Good Voltage that is present on motherboard throughout even when the laptop is shutdown
BAT Always Battery Battery connector or power
BATLOW# Battery Low Signal indicating when battery is low, Its active when the voltage is zero
BIOS The software program that controls the turn on process of components until windows takes over
BL Back Light Basic Input and Output Software Backlight
BLKT Screen or Keyboard light
BST BST power for internal voltage regulators in power supply chips
BT Bluetooth
BTN Button
C Capacitor
CHG Charging
CLK Operating frequency Clock Connector
CN Connector
CPU Processor Central Processing Unit
CS Current Sensor Determining how much current is flowing
CTL Control signal
D Diode
D Data
DC Direct Current Voltage from the battery
DCIN Direct Current Input Where voltage from charger connector and battery is connected on the motherboard
EC Embedded Controller Embedded control chip on the motherboard
EDP Embedded Display Port Display sections like display port or screen display section
Emmc Embedded Multimedia Card A chip that acts as a hard drivein portable device like phones or tablets
EN Enable Power turn on signal
FB Feedback voltage
FREQ Frequency The rate at which current changes direction per second
GFX On board graphics card
GND Common negative plate found all over the motherboard
GPU Ground
HDA High Usually refers to sound in motherboard
HDD High Definition Audio Hard disk
IO Initiate Input or Output
KB Input or Output Keyboard
KB_DET# Keyboard This signal voltage will go to zero to indicate that the keyboard is inserted
L Key Board Detected Coil
L Inductor / Coil No voltage or zero voltage
LCD Low Screen display
LDO Liquid Crystal Display Voltage that usually comes out before laptop turns on
LID Low Drop Out Top laptop housing which contains the sensor that sense when the laptop is closed
LVDS Lid Low Voltage Deferential Signaling .v Screen power voltage
MEM Memory Usually indicating RAM
MIC Microphone
MISO Microphone Transfer of data from Bios chip to Chipset
MOSI Master In Slave Out Transfer of information from chipset to Bios chip
NC Master Out Slave In Indicating when a pin or chip is not connected on the motherboard
NTC Not Connected Negative Thermal Coefficient Temperature sensing or sensors
OC Excess current
P Over Current Power
PCH Power Chipset
PCH_SMBDATA Platform Control Hub Platform Control Hub System Management Data Chipset system management data line used for chipset to communicate with other SMBUS components like Battery
PECI Platform Environment Control Interface Platform Environment Control Interface
PG .v Signal indicating when voltage is fine
PGOOD Power Good Signal indicates when voltage output is fine
PLT_RST Power Good Main turn on signal from processor to other component on the motherboard
PM Platform Reset Power Management signals from chipset to KBC
PM_PCH_PWROK Power Management Power Management Chipset Power Ok This signal indicated when chipset power is fine
PROCHOT# Processor Hot Excessive heat at the processor, This voltage goes to zero when the processor gets to hot
PS_ID Power Supply Identification Laptop Charger middle pin
PWM Alternating signal that turns on and off MOSFETs to set output voltage for example screen dim or brightness
PWR Pulse Width Modulation Consider it as Another word for voltage
PWR_BTN Power Power button
PWROK Power Button Voltage is good
Q Power Ok MOSFET / Transistor
R MOSFET / Transistor Resistor
RESET Resistor Turn on or off signal in digital electronics
RF reset Radio Frequency Refers to wave signals like FM radio or phone network signals
RMSRST# RMS Reset Chipset turn on signal from KBC
RST Reset Turn on or off signal in digital electronics
RTC Real Time Clock 3.3V for the chipset usually from Bios battery or always power
RTC_DET# Real Time Clock Detected This signal will drop down to zero to indicate that the Bios battery is detected
RX Receive The processing of receiving information on motherboard
S0 State 0 Power state where the laptop is fully on
S3 State3 Power state where laptop is in sleep mode usually with voltage on RAM
S4 State4 Power state where laptop is shut off but plugged in either with a battery or charger
S5 State5 Power state where laptop is totally shutdown
SATA State Serial Advanced Technology Attachment Data transfer technology for hard drive and CD drive
SHDN Turn off
Shutdown The word Signal indicates a .V logic level voltage
Signal Signal State of power
SLP Sleep Serial Peripheral Interface Communication protocol used in short distance communication on motherboard, like Bios
SPI Speaker
SPK Speaker Switching
SW Switch Usually referring to motherboard
SYS System Represents temperature
THERM Thermal Touch pad
TP Touch Pad Pin point for testing in the circuit
TP Test Point A chip on motherboard that stores security passwords like for hard drive encryption
TPM Trusted Platform Module The processing of sending information on motherboard
TX Transmit U Integrated Circuit Motherboard letter indicating Integrated Circuit(IC) chips
Processor Integrated graphics
UMA UMA A data communication protocol used in USB ports
USB Universal Serial Bus Voltage
V Voltage Positive voltage input
VCC Voltage Collector Positive power voltage
VDD Voltage Drain Drain Signal indicating when RAM power is fine
VDDQPWRGOOD VDDQ Power Good Part of the output voltage that goes back to the chip to let the chip know if the voltage is out and how much voltage
VFB Voltage Feedback Positive voltage input
VIN Voltage Input Voltage output
VO Voltage Output Output voltage
VOUT Voltage Output A signal that turns on Processor power Chip
VR_EN Voltage Regulator Enable Onboard graphics chip RAM
VRAM VRAM Voltage Regulator
VREG Voltage Regulator Voltage Regulator output
VREG Voltage Regulator V Voltage Regulator output
VREG V Voltage Regulator Usually ground or negative
VSS Voltage Source Source Half of RAM volts to power part of the processor
VVT VVT Signal that restricts writing data to EEPROM like Bios chip
WP Write Protect X Crystal Oscillator Motherboard letter indicating a Crystal Oscillator
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