I have same problem with my Samsung 32 inch and I replaced T Con board twice and did not fix the problem. I now believe that the Main Board is bad. If I unplug my Main Board from the Power Board my back light stays on for 2 hours+ and then when Main Board is plugged back to Power Board back light goes off in minutes. Any Agree that my Main Board is the problem?
If the backlight works (meaning that when the tv is on, and the lights in your house are turned off, there is a black glow coming from the screen) then you know your backlight is powered and such.
So far, so good... the next problem lies in one of two places (most likely). It could be the main board which is where your connections plug into the set... If this main boards output to the t-con board is dead, then replacing the main board will fix this problem....
However the more likely problem is with the T-CON board. If you open your unit, there is a silver metal casing with some screws near the top of the screen. You will notice some metallic tape at the top of this metal piece. Also, you will notice a wire harness/ribbon cable connecting just under the base of this metal. Beneath the metal is the T-CON... This board is pretty much the only thing between your main board and the screen.
Replacing the t-con could fix your issue.
If you locate this board, there should be a model number located on the upper-right corner. Be sure and replace it with the correct part.
Please keep in mind that although I am tech savvy, I am not a certified samsung technician.
I hear that a good place to order such parts is shopjimmy.com
Good Luck!
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