What is t-con board

A completely white screen with white vertical lines on your Mitsubishi WD 77731 TV can be an indication of several possible issues. Here are some potential causes:

1. Faulty T-Con board: The T-Con board is responsible for processing the image signal and distributing it to the screen. If the T-Con board is faulty, it can cause the white screen and vertical lines issue.
2. Loose or damaged cable connections: Loose or damaged cable connections can interfere with the transmission of the image signal, causing the white screen and vertical lines issue.
3. Failed backlight: The backlight of the TV illuminates the screen from behind. If the backlight has failed, it can cause the screen to appear white.
4. Damaged LCD panel: The LCD panel is the display screen of the TV. If the panel is damaged, it can cause the white screen and vertical lines issue.

To troubleshoot the issue, you can try the following steps:

1. Check the cable connections: Make sure that all cables connecting the TV to the source device (such as a cable box or gaming console) are properly connected and undamaged.
2. Power cycle the TV: Turn off the TV and unplug it from the power source. Wait for a few minutes, then plug it back in and turn it on.
3. Check the T-Con board: If the T-Con board is faulty, it may need to be replaced. You can check for any visible signs of damage or contact a professional to diagnose and replace the board if needed.
4. Check the backlight: If the backlight has failed, it may need to be replaced. You can shine a flashlight on the screen to see if there is any image visible, which would indicate a failed backlight.
5. Contact a professional: If none of the above steps resolves the issue, you may need to contact a professional for further diagnosis and repair.

Yes, it's possible that the T-Con board in your Sony LCD TV may need to be repaired or replaced if it's causing vertical and horizontal white lines on the screen. The T-Con board is responsible for translating the digital signal from the TV's main board into a format that the LCD panel can display.
Before replacing the T-Con board, you may want to try some additional troubleshooting steps, such as checking all the cables and connections, performing a factory reset of the TV, and updating the firmware. However, if none of these steps resolve the issue, then the T-Con board may need to be replaced.
You can purchase a replacement T-Con board online or from a TV repair shop. If you're comfortable with electronics repair, you may be able to replace the board yourself by following instructions provided with the new T-Con board. Alternatively, you can hire a professional TV repair technician to replace the board for you.

If you wish to get some details; check the sites linked here.
https://elektrotricks.blogspot.com/
https://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault . Search the site by type in the Brand Name of your set, in its search bar at the right side column, and press enter. See it in Webview with mobile or by desktop. Mobile View has no search box.

T'Con board fault. Check and replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD screen are similar, irrespective of its brand and screen size.

tried with re seat the LVDS cable at the t-con board. if can not get with re seat it could be bad t-con board.

You will get a white screen when you unplug the t-con from the main board. Doing so removes power to the LCD panel. Verify that all of your voltages from the power supply are correct. If they are, I'd look at the t-con board. It sounds like there is a problem with the t-con that is pulling down the main board.

It can be due to:
Dead T-CON board on the LCD panel assembly due to blown fuse or just dead board.
Dead power supply on the logic board that supplys the power to the T-CON board.
Learn more here:

Basic LCD monitor troubleshooting guide:

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

It has white screen becuase it may not be getting the 5vdc from the logic board to the T-CON board or the board has blown fuse.
Please see http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/

Also look to see if power supply/logic bd had any bad caps also.

Replace the entire DAC board (board with power suplly going into it) for easiest solution.