Vinod:
This looks as if you are connecting a 'Out' of one type to an 'In' of another type. What I mean is component and composite.
If the TV manual says AV4, it may most probably be a 'Component In'. Are you sure the STB has 'Component Out' and you have chosen that?
Please read the manual and find out the connection type for the front connection. If not, use a DVD player and and try both Component and Composite. This way you will know what is the connection type. Then if you choose the appropriate type for the STB, I am sure it will work.
Cheers
Venkat:
I checked manual, AV4, indeed is for composite. AV1 and AV2 are only component in my TV. So, when I connected DVD through RCA cables to AV4, it works perfect, no running lines and humming noise. But, when I connect the STB through the same RCA cables to AV4, I get these running lines and humming noise along with picture.
I was able to crack what the problem is two days back, it's a notorious problem that's quite common it seems, called as 'ground loop'. The thing that's driving me mad for the past four days is no body from Panasonic service/cable operators/electrician is able to stop the lines and humming noise, let alone they know what the problem is! I went to Richie Street and madly went from shop to shop telling my problem, in a hope they would at least understand, they don't even have a clue what am talking about, damn.
Finally reached the MX shop down the road and told my problem, they gave me something called as 'power stopper' a small device to fit to the cable feed of STB, got it for 50 rupees, came come and connected it, it never solved the issue, i got same running lines and humm even after connecting it.
I just don't know what to do, am really counting on two forums here to solve this issue for me as well as for future generations.
Please help somebody.