Changing a 3.5mm to phono output

Hi,

Basically, I have a mobile freeview box which connect to the tv via a 3.5mm jack to 3 phono leads, like this

3.5mm Jack to 3 x RCA Phono Lead Audio / Video AV Cable: Amazon.co.uk: Electronics

However, I always get a black and white picture for the freeview (works fine when set to analogue, i get the picture in colour)

So I was wondering, would I be able to solder the phono cables directly onto the circuit board, and would it work?

Heres some images of the circuit board

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The AV output is the left 3.5mm jack

Thanks,
Lee

I wouldn't have thought soldering wires on would make any difference - I suggest you check the settings on the box, and make sure it's set to PAL, and not NTSC.