Overview of voltage sources on laptops

Discussion in 'Computer Repair' started by Admin, Oct 31, 2018.

Overview of voltage sources on laptops 5 5 1votes
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  1. Admin

    Admin Repair Tv & Laptop Staff Member

    PRINCIPLES PROVIDE LAPTOP SOURCING

    1. The voltage source of the Laptop.


    • Input voltage from 16 to 20V (the focus between DC IN and PIN source)
    • 3.3V standby voltage (the supply voltage for the source control IC)
    • 5V voltage level (pre-press the power switch for charging control circuit)
    • 3.3V power supply (pre-press the power switch for the charging control circuit)
    • 5V secondary voltage (for drives, male chipsets, USB, LCD ...)
    • 3.3V secondary power supply (for Male Chipset, BIOS, SIO, Clock Gen, PCI, Sound, Network ..)
    • 2.5V supply for DDR
    • 1.8V supply for Video Chip and for DDR2
    • 1.5V power supply for two chipsets.
    • 1.25V power supply for DDR
    • 1.2V power supply for two chipsets
    • VIO voltage is about 1.05V auxiliary power supply for the CPU.
    • Voltage 0.9V auxiliary power supply for DDR2
    • VCORE main power supply for CPU



    In one machine, these voltages have different names:
    - For example, in an IBM T42 machine the input voltage is called VINT16 and the 5V voltage is called VCC5M, the secondary voltage is VCC5VB
    In different models, the name is different:
    For example, the input voltage of the IBM T42 is called VINT16, but the input voltage of the ASUS is called AC_BAT_SYS or the voltage of the front 5V of the IBM T42 is called VCC5M but on the ASUS 5V Previously named 5VSUS ...
    If there are 10 lines of laptop and each line has about 10 voltages, the number of voltage lines has different names up to a hundred lines. => What a terrible, hard to remember !!!
    However, the voltage lines on them have common characteristics, so easy to remember, based on the common characteristics we divide the voltage into five voltage groups as follows:

    • Input Voltage (Input Source)
    • Standby Voltage (Standby Source)
    • Front-end voltage (front power supply)
    • Secondary Voltage (Secondary Source)
    • VCORE Voltage (VCORE Source)

    Characteristics of the above voltage groups are:

    • The five groups of voltages over time vary according to the following: Input voltage (1) => Standby voltage (2) => Forward voltage (3) => Secondary voltage 4) => VCORE Voltage (5)
    • Voltages in the same group have equal time.
    • The above voltage groups appear to be bridging, meaning that there is a voltage before the voltage, so be aware that it makes it easy to zoning to determine the cause of the disease.



    2.Features of voltage groups (voltage sources) on laptops.

    1. Input Voltage (Input Source).

    • Input voltage from 12 to 20V (the point of focus between DC IN and PIN source).
    • The first power source to appear on the machine when the battery or plug adapter.
    • On the laptop computer, the input source goes to the pulse source to supply the voltage to the active pulse source, in addition to the input power supply directly to the inverter to generate the illumination of the screen.
    • When the machine has input power, the machine has not eaten the line or eat a negligible stream.




    2. Standby voltage (standby source).

    • The standby voltage of 5V (or 5V and 3V) is the first low voltage source available on the machine to provide for some low voltage circuits to run before the source of the pulses.
    • The standby voltage usually comes from the All Always_On pins of the oscillating ICs generating 5V and 3V voltage levels, which are often called VL, or LDO or VREG3 and VREG5.
    • The standby voltage can be used to power the SIO chip (source control IC) or to provide 5V, 3V open source and temporary supply to the Vcc pin (5V) of the power supply fluctuations.
    • If the machine has no input source, then there is no standby source and if there is no power source, there is no power source behind.


    3. Front-end voltage (power supply)

    • The 5V and 3V voltage levels are the first low voltages, but are generated by the pulses to supply the charging circuit and the secondary 5V and 3V power sources.
    • The 5V, 3V power supply operates before you press the power switch (if the power adapter is used), if the adapter is plugged into the battery only, it runs after the switch.
    • Previous power supply depends on input source and source standby, if there are no two voltages, the power supply is not available.
    • The machine does not turn on the light (equivalent no secondary source), the cause is usually due to power loss before 5V, 3V.
    • When the machine has a pre-power supply, it typically consumes about 0.01 to 0.03A of current


    4. Secondary Voltage (Secondary Source).

    • Secondary sources are all the voltages that appear after the switch is pressed to prepare the unit for operation, which includes the following voltages.
    • 5V secondary voltage (for drives, USB ports, LCDs, ICs).
    • 3.3V secondary power supply (for Male Chipset, BIOS, SIO, Clock Gen, Mini PCI slot, Sound, Network ..) and power supply.
    • 2.5V voltage (if available) main power supply for DDR1.
    • 1.8V voltage for Video Chip and main source for DDR2.
    • 1.5V power supply for two chipsets.
    • Voltage 1.25V (if available) auxiliary power supply for DDR1.
    • 1.2V power supply for two chipsets.
    • VIO voltage is about 1.05V auxiliary power supply for CPU and for two chipsets.
    • Voltage 0.9V auxiliary power supply for DDR2.
    • The secondary sources work only when the 5V power supply of the unit is working properly (as this voltage is applied to the Vcc pin of the IC oscillating secondary sources)



    5. VCORE Voltage (VCORE Power Supply)


    • VCORE main power supply for CPU.
    • The VCORE source appears last and it depends on the 5V and 3V secondary voltages (because these voltages supply the Vcc pin of the VCORE source oscillator)


    ** Illustrate some voltage sources on some popular laptops **


    IBM T40, T41, T42


    Input sources:
    VINT16
    (VINT20)

    Standby Source:
    ALWAYS_ON
    Ra on foot VL
    The IC's oscillate 5V and 3V

    Props:
    VCC5M
    VCC3M

    Secondary sources:
    VCC5B
    VCC3B
    VCC2R5A
    VCC2R5B
    VCC1R5B
    VCC1R25B
    VCCCPUIO
    VCCVIDEOCORE

    VCORE resources:
    VCCCPUCORE

    DELL D600

    Input sources:
    PWR_SRC

    Standby Source:
    ALWAYS_ON
    Out at the foot of the LDO
    The IC's oscillate 5V and 3V

    Secondary sources:
    + 5VSUS
    + 3VSUS

    Secondary sources:
    + 2_5VSUS
    SMDDR (1,25V)
    VGACORE
    + 1.5VSUS
    + 1.05V_VCCP
    + 1.8VRUN
    VTT (1.05V)
    VCC1_2_MCH (1,2V)

    Vcore source:
    + VHCORE

    DELL D630

    Input sources:
    + DC1_PWR_SRC

    Standby Source:
    ALWAYS_ON

    Power supply in advance
    + 5V_ALWP
    + 3V3_ALWP


    Secondary sources
    + 1.05V_VCCP_P
    + 1.5V_RUN_P
    + 1.8V_SUSP
    + 1.25V_RUNP

    CPU power:
    + VCC_CORE

    HP DV6000

    Input sources:
    VIN

    Standby Source:
    ALWAYS_ON
    Out at the foot of the LDO
    The IC's oscillate 5V and 3V

    Props:
    5VPCU
    3VPCU

    Secondary sources:
    1.8VSUS
    + 1.5V
    + 1.05V
    VGACORE

    CPU:
    VCC_CORE

    HP DV2000

    Input source:
    DCBATOUT

    Standby Source:
    ALWAYS_ON
    Out at the foot of the LDO
    The IC's oscillate 5V and 3V

    Props:
    5V_S3
    3V_PWR

    Source level
    1D05_S0
    1D8V_PWR
    1D5V_S0
    VGA_CORE_PWR

    CPU power
    VCC_CORE_S0

    ASUS T76S

    Input sources:
    AC_BAT_SYS

    Waiting:
    ALWAYS_ON
    Out at the VREG5 and VREG3 pins of the IC oscillate 5V and 3V

    Props:
    + 3VSUS
    + 5VSUS

    Source mail
    + 1.8V
    + 3V
    + 5V
    + 0.9VS
    + 1.5VS
    + 1.25VS
    + 2.5VS
    + 3VS

    CPU power
    + VCORE

    ACER

    Input sources:
    DCBATOUT

    Standby Source:
    ALWAYS_ON
    Out at the VREG5 and VREG3 pins of the IC oscillate 5V and 3V

    Props:
    5V_PWR
    3V_PWR

    Secondary sources:
    5V_S0
    5V_S5
    1D8V_PWR
    1D5V_S0
    1D05V_PWR
    VGFXCORE

    CPU power:
    VCC_CORE

    SONY M780L

    Input source:
    DCBATOUT

    Props:
    + 3VALW
    + 5VALW

    Secondary sources:
    + 1_5VRUN
    + 1_8VSUS
    + 1_05VRUN

    CPU power:
    VHCORE
     
    Last edited: Feb 21, 2019


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