LCD Panel All Voltage and Signal Test point Name and its Use

Here in this article we will see about all the LCD LED TV Panel Voltage and signal test point name and its use or we will understand how this signal work.

Connection NameConnection WorkingVoltage
VGHPositive supply26 to 30v
VGLNegative Supply-6 to -10v
VONVON is the positive supply voltage for the CKV, CKVB,
and STVP (Also called “Gate-On Supply”)
20 to 30v
VOFFVOFF is the negative supply voltage for the CKV,
CKVB and STVP (Also called “Gate-Off Supply”)
-6 to -9v
V.COMCommon Voltage for TFT6 to 9v
VSSDigital groundGND
VDDVDD is the logic supply input for the scan driver
VCLNegative Supply-10 to -12v
OE (Active-High)1. Gate-Pulse Output Enable.
2. CKV and CKVB leave the high impedance charge-sharing state on the rising edge of OE.
Pulse/Frequency
STV1. Vertical Sync Input.
2. The rising edge of STV begins a frame of data.
3. The STV input is used to generate the high voltage STVP output.
Pulse/Frequency
CPVVertical Clock-Pulse Input. CPV controls the timing
of the CKV and CKVB outputs, which change state
(by first sharing charge) on its falling edge.
Pulse/Frequency
CKVHigh-Voltage, Gate-Pulse Output.Pulse/Frequency
CKVBHigh-Voltage Scan-Drive Output.Pulse/Frequency

A Brief Details of Panel Voltage and Signal Test point Name and its use.

  • OE (Active-High, Gate-Pulse Output Enable)
    • CKV and CKVB leave the high impedance charge sharing state on the rising edge of OE.
  • CPV (Vertical Clock-Pulse Input)
    • CPV controls the timing of the CKV and CKVB outputs that change state (by first sharing charge) on its falling edge.
  • STV (Vertical Sync Input)
    • The rising edge of STV begins a frame of data. The STV input is used to generate the high-voltage STVP output.
  • STVP (High-Voltage, Start-Pulse Output)
    • STVP is low (connected to GOFF) whenever STV is low and is high (connected to GON) only when STV is high and CPV and OE are both low.
    • When STV is high and either CPV or OE is high, STVP is high impedance.
    • STVP High-Voltage Scan-Drive Output. STVP is connected to VOFF when STV is low and is connected to VON when STV is high and CPV1 is low. When both STV and CPV1 are high, STVP is high impedance.
  • CKV (High-Voltage, Gate-Pulse Output)
    • When enabled, CKV toggles between its high state (connected to GON) and its low state (connected to GOFF) on each falling edge of the CPV input. Further, CKV is high impedance whenever CPV and OE are both low and whenever CPV is low and OECON is high.
  • CKVB (High-Voltage, Gate-Pulse Output)
    • CKVB is high impedance to allow connection to CKV, sharing charge between the capacitive loads on these two outputs.
    • CKVB is the inverse of CKV during active states and is high impedance whenever CKV is high impedance.
  • CKVB1 (High-Voltage Scan-Drive Output)
    • CKVB1 is the inverse of CKV1 during active states and is high impedance whenever CKV1 is high impedance.
  • CKVB2 (High-Voltage Scan-Drive Output)
    • CKVB2 is the inverse of CKV2 during active states and is high impedance whenever CKV2 is high impedance.
  • CPV (Vertical Clock-Pulse Input)
    • CPV controls the timing of the CKV and CKVB outputs, which change state (by first sharing charge) on its falling edge.
  • CPV1
    • CPV1 controls the timing of the CKV1 and CKVB1 outputs, which change state (by first sharing charge) on its falling edge.
  • CPV2
    • CPV2 controls the timing of the CKV2 and CKVB2 outputs, which change state (by first sharing charge) on its falling edge.
  • SCL (Serial Clock)
    • The line that carries the clock signal.
  • SDA (Serial Data)
    • This line is use for send and receive Data.
  • VDD
    • VDD is the logic supply input for the scan driver.
  • VON Gate on Supply.
    • VON is the positive supply voltage for the CKV, CKVB, and STVP high voltage driver outputs.
  • VOFF Gate-Off Supply.
    • VOFF is the negative supply voltage for the CKV, CKVB, and STVP high-voltage driver outputs.

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