Samsung Note 2 N7105 not registering on network

Shouting out for any help.

I've got a Samsung Galaxy note 2 N7105.

About 9 months ago I replaced the motherboard with a secondhand board from a broken phone and all was good.

Last month I decided to listen to some music using headphones and it was very crackly, but improved if I squeezed the phone case.

Quick check on google and apparently its a common problem , so dismantled the phone (again) and cleaned everything up. Put it all back together and hey presto ! .. Audio was working fine... BUT then I noticed that I had no mobile signal.

Without a sim installed I have 3 or 4 bars, although I have no idea what network its getting that from !... When I put the sim back in, the bars disappear and I get the not registered on network error message.

I've tried automatic network selection and manual but it makes no difference.

I've dismantled the phone and made sure all the sockets and wires are where they should be but still cant get a mobile signal with a sim in.

Wifi works fine.

Any thoughts (apart from throw it away !).

Thanks in advance.

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