Hi Steve,
This is an indication of faulty earphone jack, this is where the headset directly hooked up. See sample picture below.
When the you hooked up the headset to this jack, internal switch will released the contact to cut the audio goes to the main speaker out of the unit. Once you pulled out the headset plug, the audio will back to the main output speaker out through this switch.
In your cased, there's a malfunction in the internal switch of the earphone jack that's you haven't sound output at the main speaker out.
You may spray contact cleaner directly to the earphone jack while inserting and pulling out the headset plug to clean the lead. If the symptom still persist, you must replaced it with new one to back the unit in normal operation again.
Hope I helped you.
Have a nice day!
Thanks for using Fixya
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