cof ic voltages understand

I know all the LCD LED TV technician many time face problem during checking the voltage of Panel COF IC which is used in every single LCD LED panel. So today I am going to discuss about all type of COF IC voltages.

                                Darla India

* What is COF IC: - COF IC is the main part of the all type of LCD LED panel because main board and panel getting connected through the COF ic and all the signals goes in to the panel with the help of COF IC. I will mostly focus on the How to download COF ic datasheet, Common voltages of the COF IC, if you can not get the COF ic datasheet then what you can do and how to make datasheet COF IC datasheet yourself.

* How to get COF IC Datasheet: I would like to tell all of you, you can't get the COF IC datasheet from the internet most time, so if you want to get COF IC datasheet immediately then you will contact with your friends or any other LCD LED TV technician or you can contact with YouTube who provide COF IC datasheet free of cost or you can buy COF IC datasheet from the YouTube who want to cell their experience and hardworking things for the few donations.

* COMMON VOLTAGES OF COF IC DATASHEET: So guys here I'm going to discuss about the main and common voltage of COF IC which is use in all LCD LED TV panels. So lets get started

(Darla.india) posted in world of electronics group

   i) VGL voltage (20v to 30v) This is the most common voltage of any kind of panel like LCD panel or LED panel and if this voltage is getting weak and missing the you will get NO PICTURE problem in your panel.

   ii) VGL (-5v to -12v) VGL voltage also most common voltage for the panel. SLOW MOTION PICTURE will show in the panel if this voltage do not produce and can not getting in the panel COF IC.

    iii) DVDD (3.3v) This voltage have many names like VDD, VLOGL, CV33V, etc. So if this voltage is missing in the panel COF IC then main problem we get in the panel that is SLOW MOTION PICTURE.

   iv) AVDD (12v to 20v) similarly this voltage have more name like VDDA, VSA,etc. If this voltage do not produce in the panel through the COF IC then the msin problem is getting in the panel is NO PICTURE.

   v) CKV1, CKVB1, CKV2, CKV2 these are not voltages these are signals track which are used for control the picture stability and double imaging so if you get DOUBLE IMAGE problem in the any panel the cut these type of track lines your DOUBLE IMAGE problem will be fix and make graphic properly

Posted in world of electronics group in telegram...by Darla.India

PANEL VOLTAGES UNDERSTANDING

Darla:

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.

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 when STV is hi