LC-80LE632U main board to t con board ribbon cable

I assume when you say unhooking one of the ribbon connectors leaves half the screen white or black and the other has a picture, if you've replaced he tcon and it didn't fix it your going to find your panel is bad, a main board shouldn't cause your issue as long as unhooking one of the ribbon connectors gives half a picture

The top side of the tcon board hooks to the LVDS (low voltage digital signal) cable and to the main board, the bottom side has flat ribbon cables that go to the panel boards on the panel. Generally those are hid by a metal shield so are partly hidden. If you've broken one of the panel connector that's not good as those can't be replaced without replacing the panel and those generally aren't available from the manufacture, and in the rare case they are the cost is as much as a new TV runs. I'm not sure this is what your talking about however as there would have been no reason to disconnected the flat connectors going from the tcon to the panel, to replace the tcon all you needed to do is unhook the LVDS cable and the 2 ribbon connectors on the tcon, put the new in and reconnect the 3 connectors.

I need help my tv isn’t playing any sound please help!!!

Hook the Tcon cable back up and do this. With a program running on the TV, shine a flashlight in the screen. If you can't see movement from the program, then the Tcon board is bad. you can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy

try here theres lots diy fixes

http://electro-medical.blogspot.in/2015/11/lcd-tv-t-con-board-troubleshooting.html

Hi,
I changed the t-con and ribbons on the 55" model precedeing this one and both ribbons terminated at the t-con board, check that it is not hidden beneath a large aluminum square metal plate

Double check the LVDS (cable from the main board to t-con) cable connection. Give if a wiggle to see if anything changes. Also check the ribbon cable (s) between the t-con and the LCD panel itself. It is possible that you may have a defective T-con board. Outside of checking the mentioned cables, you should get a professional diagnoses.

Check all ribbon connections, and LVDS (cable from main board to t-con) connections. I'm thinking you may have an issue with the LCD panel itself. If that is the case, it will not be worth repairing.

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.

That can be bad LCD PANEL, T-CON board, main board, poor ribbon cables connections between the LCD panel and the T-CON board. You will need to try cleaning and reseating the panel and the T-CON board first.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

Please post back what you find.