ONIX OA21 Fault finding help!

Hi All,

Hoping someone can help me.... but I'm fully aware... you probably cannot teach a chip calculus.

I have a reclaimed ONIX 21 + SOAP and it sounds lovely, when it works. I have it hardwired to a Roland Cakewalk and fed from my Mac via USB. - Probably not the most "Audiophile" way of feeding it, but it suits me and sounds better than my NAD C350 did.

When I fist got it and fired it up it was great (4-5 days ago?). Maybe a little light on bass but i put a graphic in (Boom for mac) and everything was tickaty-boo.

Now things have started to deteriorate. It turns on and works fine, no hum, no buzz no hiss. Then starts intermittently crackling, hissing and popping though the right channel. I removed the source no change, turned it right down, still no change.

So, now I need to repair it. I have.... a nice new multimeter, some screwdrivers and a 24 year old GCSE Physics.

I took out the board and looked for any dry joins or discolouration but could see nothing.

Put it back together and unfortunately that didn't fix it. (no real surprise!)

Do I really need to pay someone? If not, where do I even start?

If my expectations are to high... so be it. But I'de like to give it a go!

Thanks

James