LCD TV Problems

LCD LED TV panels connection understanding by Imran Ashraf.

(1)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.

(2)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.



(3)CPV1

CPV (Clock Pulse Vertical) -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.



(4)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.



(5)CPV3

Vertical Clock Pulse Input.

CPV3 controls the timing of the

CKV3 and CKVB3 outputs, which change state (by first sharing charge) on its falling edge.



(6)CKV1

 CKV( Clock Signal)- High-Voltage Scan-Drive Output.

When enabled, CKV1 toggles between its high state (connected to VON) and its low state (connected to VOFF) on each falling edge of the CPV1 input. Further, CKV1 is high impedance whenever CPV1 and STV are both low.



(7)CKV2

High-Voltage Scan-Drive Output.

When enabled, CKV2 toggles between its high state (connected to VON) and its low state (connected to VOFF) on each falling edge of the CPV2 input. Further, CKV2 is high impedance whenever CPV2 and STV are both low.



(8)CKV3

High-Voltage Scan-Drive Output.

When enabled, CKV3

toggles between its high state (connected to VON) and its low state (connected to VOFF) on each falling edge of the CPV3 input. Further, CKV3 is high impedance whenever CPV3 and STV are both low.



(9)CKVB1

CKVB (Inverted Clock Signal)- High-Voltage Scan-Drive

Output.

CKVB1 is the inverse of CKV1 during active states and is high impedance whenever CKV1 is high impedance.



(10)CKVB2

High-Voltage Scan-Drive Output.

CKVB2 is the inverse of CKV2 during active states and is high impedance whenever CKV2 is high impedance.



(11) CKVB3

High-Voltage Scan-Drive Output.

CKVB3 is the inverse of

CKV3 during active states and is high impedance whenever CKV3 is high impedance.



(12)CKVCS1

CKV1 Charge Sharing Connection. CKVCS1 connects to

CKVBCS1 whenever CPV1 and STV are both low (to make CKV1 and CKVB1 high impedance) to allow CKVB1 to connect to CKV1, sharing charge between the capacitive

loads on these two outputs.



(13)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.



(14)CKVCS3

CKV3 Charge-Sharing Connection. CKVCS3 connects to

CKVBCS3 whenever CPV3 and STV are both low (to make CKV3 and CKVB3 high impedance) to allow CKVB3 to connect to CKV3, sharing charge between the capacitive loads on these two outputs.



(15)CKVBCS1

CKVB1 Charge-Sharing Connection. CKVBCS1 connects to

CKVCS1 whenever CPV1 and STV are both low (to make CKV1 and CKVB1 high impedance) to allow CKV1 to

connect to CKVB1, sharing charge between the capacitive loads on these two outputs.



(16)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.



(17)CKVBCS3

CKVB3 Charge-Sharing Connection. CKVBCS3 connects to

CKVCS3 whenever CPV3 and STV are both low (to make CKV3 and CKVB3 high impedance) to allow CKV3 to connect to CKVB3, sharing charge between the capacitive loads on these two outputs.



(18)BOOST

Operational Amplifier Supply Input. Connect to VMAIN

(Figure 2) and bypass to BGND with a 1μF or greater ceramic capacitor.