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It still could be a bad jack - the plating tarnishes, creating a high resistance between normally closed contacts - plugging a earphone in and out a few times will usually do the trick, else some Isopropyl Alcohol and a soft brush.
Does the speaker have continuity? Start there, and work back to the jack - a pinched wire, a loose/off terminal on the speaker...
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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