sAMSUNG 32" UE32EH5000K

[J_@_N]

I have 32" UE32EH5000K and I`m in a pickle. I can see the picure with torch against the screen so problem with backlight, OK. I`ve checked power board and there is 240V going to LED strips (tested to ground) so next tested, with 30V battery, each of my 4 LED strips (10 LED each) and all fine. I`ve tryed disconecting the logic board but the back lights stay down. Any ideas?