Cracking Open the Samsung Galaxy Tab 8.9: 3.5 mm headphone jack, microphone and ambient light sensor
The 3.5mm headphone jack, microphone, and ambient light sensor are all connected. They are held in place with a pair of metal brackets and adhesive.
Although the brackets are easy to removed, the light sensor is firmly attached to the front glass panel. I feared prying it loose would damage the sensor, so I left the components in place.
Photo by: Bill Detwiler / TechRepublic
Caption by: Bill Detwiler