L.C.D L.E.D T.V Panels Connection and Voltages Understanding

L.C.D L.E.D T.V Panels Connection and Voltages Understanding
BY IMRAN ASHRAF 
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. 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

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