Samsung UE48H6620SV, no picture

[JJRade]

The backlight was not working properly, I replaced it and it works
but when I installed the board and connected the 2 straight cables to the T-con, there is no backlight.
I connected the satellite receiver with a scart cable and there are tons of them.
When I disconnect one flat cable (left or right) there is a backlight, but there is no image on the display, but of course there is sound.
When the backlight is on, the entire screen is dark blue.
There is a voltage of 12V DC on the T-con and the fuse on the T-con is correct.
Please help, what should I do next?
Thank you!