Thank you for your attention
when connect rgsb signal to a standard monitor (with green and gnd signal) when a noise occur monitor display go off and on again (TFT Controller start automatic detection of signal again) but when connect to my display (It is a fix resolution Display) it is have a line in display (Horizontal). It is show that my problem perhaps related to composite sync separation from video. but I do not know how to fix it?
yes I have a multilayer board that have solid ground plain under the part.
yes I have EMI filter and other part so my power rail is clean.
first cutoff set to 18MHz and then set to 36MHz.both of them have same problem.