After removed the earphone from the jack, the speaker failed to work.
I believed this is likely due to the mechanical defect in the earphone jack.
There is a small spring inside the jack which act as a on/off point to route the sound signal to the earpiece when inserted. However, it get stuck at the same position after the earpiece had been removed.
If you insert the stylus into the jack and twist for a few times, you might release the spring and the speaker will work again.
I tried using some cotton bud soak with little W40 lubricating oil and apply into the jack and now I am able to get rid of the jack problem.
