i wrote this in the Workshop How to rebuild a MX4000 MX6000 MX7000 and AV9000 (http://forum.beoworld.org/forums/p/24571/191760.aspx#191760) but never got answered..

thats why i am posting the subject here as a new one..

I have one MX 4000.. TYPE 7870

the TV works just fine, but since two weeks the picture jumps in the vertical direction.. not too often.. it dosent happen allways when its on.. from time to time it jumps 2-3 times and than probably 1 more in a interval of several minutes and than it works fine.. sometimes just 1 time.. simultaneously comes a very low S-S-S sound.. im not sure if the sound comes allways when it jumps..

what could this be?

thanks..