No sound, but sound from headphones on Mac 128k

[macfan2350]

Hi everyone, hope your all doing well. Another question. One of my Macintosh 128k's works perfectly fine, other than the fact the internal speaker seems completely dead. I get no sound from it. When I plug in headphones, I do get sound. I remember a while ago it did work, but then I plugged in some speakers (not sure why) and then I never heard from the internal speaker ever again. I never never taken it apart. 

Any help is welcome. Thanks!

 

[bibilit]

Can be the speaker going bad, so far i have replaced only one. 

Can also  be the connector, the internal speaker is disabled when external is plugged. 

 

[Dog Cow]

Can also  be the connector, the internal speaker is disabled when external is plugged. 

I would put my money on the problem being closer to the connector than the speaker.

 

[SE30_Neal]

Dry joint maybe