Hi,

My VTX is 12V powering it from the PDB that have BEC for 5V output which i used to power the camera
I've connected the lc filter before the VTX but i'm still having these annoying lines while flying.

what camera are you using? you need the filtering for the whole FPV system, that means VTX, Camera and OSD.
it's probably best to get something like a Demon Core PDB or Matek that comes with ready built-in LC filter before the 12V/5V voltage regulators...

camera is Quanum Super Mini 520TVL from HK
I have another lc filter so i'm gonna give it a try and connect one for the 12V VTX + OSD and the second for the 5V camera

it's a lot better after I connected the OSD to the same lc filter along with the VTX, camera is still connected directly to the PDB 5V BEC
There is still some small noise but the lines are gone, Thanks

I have 2 matek PDB boards, one is Mini POWER HUB w/ BEC 5V & 12V and LED & POWER HUB 5IN1 V3 but this PDB doesn't have LC filter, I just checked that

I ordered 2 of them and if they don't have filter then Oscar has to send me one with LC filter ...

That's for sure that Oskar should send you one with LC filter