Problem with DivX on LG TV

Hello

I bought new full HD TV LG 42 SL900 2 months ago and i tried, if it can play divx movies. It plays them pretty well but the problem appears, if i want play mkv files with DTS audio. The video plays but without sound. Mkv files with AC3 audio plays without problem.

Is there any way to update tha software or just codec on that TV?

P.S: I enabled the certification...i expected some auto codec updates but it didnt do any updates. :-/ So, what is the point of enabled certification?

Best Regards
Hotaro