L.C.D L.E.D T.V Panels Connection and Voltages Understanding
Here we talking about the main voltages and pin connection of L.C.D and L.E.D T.Vs
Panels, every technician should know where to test and how to check voltages of each connection as they mention in Service Manual or schematic diagram or at least you should know the basic working voltages.
Darla. India
Connection Name Connection Working Voltages
1. VGL in Driver negative P.supply1 Around -10.5v
2. VCL in Driver negative p.supply2 Around -10v to -12v
3. VSS Digital ground GND
4. VDD VDD is the logic supply input for the scan driver.
5. VGH Supply LCM driver output Around 12v+ to 19.5v+
6. 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. PulseL.C.D L.E.D T.V Panels Connection and Voltages Understanding
Here we talking about the main voltages and pin connection of L.C.D and L.E.D T.Vs
Panels, every technician should know where to test and how to check voltages of each connection as they mention in Service Manual or schematic diagram or at least you should know the basic working voltages.
Connection Name Connection Working Voltages
1. VGL in Driver negative P.supply1 Around -10.5v
2. VCL in Driver negative p.supply2 Around -10v to -12v
3. VSS Digital ground GND
4. VDD VDD is the logic supply input for the scan driver.
5. VGH Supply LCM driver output Around 12v+ to 19.5v+
6. 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. Pulse
7. CPV1 Vertical Clock-Pulse Input. CPV1 controls the timing of the CKV1 and CKVB1 outputs, which change state (by first sharing charge) on its falling edge.
Pulse
8. CPV2
9. V.COM out Vertical Clock-Pulse Input. CPV2 controls the timing of the CKV2 and CKVB2 outputs, which change state (by first sharing charge) on its falling edge.
Common signal output TFT Clock pulse
Signal pulse
10. POL in Supply input common signal Signal
11. VDC in Supply +5.0v min
12. VON Gate-On Supply. VON is the positive supply voltage for the CKV_, CKVB_, and STVP high-voltage driver outputs. Around 20v+
13. V-OFF Gate-Off Supply. VOFF is the negative supply voltage for the CKV_, CKVB_, and STVP high-voltage driver outputs. Around 8V-
Brief Details of Panels Connection Points
Darla. India
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.
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.
CPV1 Vertical Clock-Pulse Input. CPV1 controls the timing of the CKV1 and CKVB1 outputs, which change state (by first sharing charge) on its falling edge.
CPV2 Vertical Clock-Pulse Input. CPV2 controls the timing of the CKV2 and CKVB2 outputs, which change state (by first sharing charge) on its falling edge.
EN Enables the MAX17121. Drive EN high to start up the MAX17121 after a delay time, which is set by a capacitor at DLY.
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.
CKVBCS2 CKVB2 Charge-Sharing Connection. CKVBCS2 connects to CKVCS2 whenever CPV2 and STV are both low (to make CKV2 and CKVB2 high impedance) to allow CKV2 to connect to CKVB2, sharing charge between the capacitive loads on these two outputs.
CKVCS2 CKV2 Charge-Sharing Connection. CKVCS2 connects to CKVBCS2 whenever CPV2 and STV are both low (to make CKV2 and CKVB2 high impedance) to allow CKVB2 to connect to CKV2, sharing charge between the capacitive loads on these two outputs.STVP High-Voltage Scan-Drive Output. STVP is connected to VOFF when STV is low and is connected to VON
PANEL VOLTAGE AND TEST POINT
Technictech
Darla India
PANEL VOLTAGE AND TEST POINT
VON = VGH = VGON = VDDG = 20v to 30v
Gate-On Sales. VON good power supply for CKV_, CKVB_, and STVP high-voltage driver Results.
This VGH voltage (VGate High) is made up of DC-DC circuits. And their voltage is about 20V ~ 30V but it will depend on the construction of the T-con board. The VGH volume feature is offered to the Gate Driver Board as a “switch ON” feature.
VOFF = VGL = VGOFF = VEEG = -5v to -9v
Gate-Offers. VOFF is the power supply for CKV_, CKVB_, and STVP high-voltage driver outputs.
VGL (VGateLow) power is generated by the DC-DC phase as well. Some T-con boards will use a voltage as high as -15V or a low voltage as -1V. So it will depend on the design of the T-con and not much on the market. It is usually -5V ~ -7V. This undesirable voltage is provided by the Gate Driver Board. The VGL volume is similar to the “Turn Off” feature. When a VGL voltage supply is supply.
VDD = Vlogic = Vddd = Dvdd = 3.3v
Input Installation. VDD is the input driver of the scanner input.This VDD voltage comes from the DC-DC IC or uses an external Voltage Regulator IC to do so. 3.3V and other cables such as 2.5V (VDD25) and 1.8V (VDD18) using VDD 3.3V voltage converter. After the production of VDD power is fed into the Time Management section, the Source Driver Board and Gate Driver Board.
VDA = Avdd = Vdda = Vsource = 13v to 20v
This VDA voltage is approximately 14V ~ 20V and will depend on the design of their T-con board. VDA power is generated by DC-DC Converter circuits. It is used to donate to GAMMA circuits and access to the Source Driver Board
VCOM = 5.5v to 8.5v
half avdd suply use of pixel light output
STV = squre wave signal with a frequency of 92.72khz
Direct sync installation. The growing STV frontier starts the data framework. STVP input is used to produce high-resolution STVP output.
STVP
Extracting High-Voltage Scan-Drive. STVP is connected to VOFF when STV is low and connected to VON when STV is high and CPV1 is low. When both STV and CPV1 are high, STVP impedance is high
CPV1
CPV (Clock Pulse Vertical) -Vertical Clock Pulse Input. CPV1 controls the timing of the effects of CKV1 and CKVB1, which alters the status (by pre-charging sharing) at its falling ends.
CKV1
CKV (Clock Signal) - High-Voltage Scan-Drive output. When enabled, CKV1 switches between its higher state (connected to VON) and its lower state (connected to VOFF) on each falling edge of CPV1 input. In addition, CKV1 has a high impedance whenever CPV1 and STV are both low.
CKV2
Extracting High-Voltage Scan-Drive. When enabled, CKV2 converts between its higher state (connected to VON) and its lower state (connected to VOFF) on each falling edge of CPV2 input. In addition, CKV2 has a high impedance whenever CPV2 and STV are both low
Copy from India electronic group
