Picture went out watching it.. I replaced the t con bord and the main board and still have no picture???

Hi Pat, I'd test F1 on the tcon board to see if it's blown, if it tests ok try a main board, only way to know for sure if the main is outputting video to the tcon would be with a scope

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with the green issue I would think main. t-conns bad too. are you sure its not cable box ? we have had many with green picture issue and sound loss

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Main Board. If changed main board, the problem still there, please try a new T-CON board.

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
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There is some incompatibility issue. Did you check the format is set correctly for PAL/SECAM etc.?

It could be a non-compatibility issue.

When it goes gray, means that the T-CON goes bad after warm up or it does not receive the 12vdc feeding it from the main board, or the main board is bad, try running the TV with the back open with small fan blowing in the back, otherwise you can get a can of cold spray for electronics troubleshooting fro Radio Shack or repia shop and try cooling the T-CON bord or the main logic board with it to see will the pictures come back on. Also check the power supply for bad DC filter caps.
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

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