In Hardware

I just replaced the 72 pin connector in my NES, using instructions on this site and various other sites. However, whilst the games load o.k, there's no sound in of my games. It's not the TV and i've tried the ariel lead and the coloured connectors on the side, the picture's fine but no sound. I had a look inside the NES and all the wires are intact. The sound was fine before I replaced the connector, and was working on and off earlier but has now stopped entirely.
Has anybody got any suggestions as to how I can fix this, or is it buggered forever?
Thanks.

Without digging up a pinout of the NES cart connector, I'd say it sounds like there are dedicated pin(s) for the audio from the cart, and you just haven't got 'em connected cleanly. Pull the connector off, clean up the board and shove it back on there.

Else, You may have been a bit rough and broken a resistor or something in the audio circuit. Which, without some soldering skills, is "buggered forever".

Well...yesterday I had some free time so I decided to give it a go. I opened it up, and found that the connector was in firmly. I looked at the board, and everything was in order and it was pretty clean. I was about to give up on it, but then I thought i'd try the white lead in the red coloured outlet on the side, and I got sound that way. So I now have sound, but only out of the left speaker, at least until I find a better RF lead.

You could just get a little splitter thing, composite provides better picture quality than RF.

What you need is a little cable with one RCA "in" jack on it, and two "out", just plug the NES audio into the "in" and plug the "out" cables into your TV.

I'll definately give that a try.
Indeed, the composite picture is superior, it provides a nicer, crisper picture.