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Hi , I`m Jack Perhaps I can help you with this problem but first could you please send me a reply when you see this ?
If the backlight comes on and you replaced the t-con then the main bard would definitely be the next suspect but did that new t-con change anything whatsoever ?
What do you have now , just a blank screen ?
No menu or OSD (volume bar , inputs display etc.) ?
Here is a link where you can see if you got the correct versions of t-con for your tv , there are some 6 or 7 versions of it ;
Once you are satisfied you got the correct replacement then you can use that link to get the correct main board or part number for your main board .
That link is the most complete site for the various parts available for this model so you can match yours there before doing any more buying .
If you need help with this then let me know but to answer your question , if you got the correct t-con and it is installed correctly (double check your install) then the main board is the problem .
If that answers your question please do not forget to rate by clicking on the 5-star icon at the top, then click on Submit so i get paid for my time helping you .Also note that it will not close this post , you can come back here at any time if you have questions. Thank you