Samsung PN51D495A6D User Guide - Page 205
Plasma TVs typically make a soft humming sound. This is normal. It's - replacement screen
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Issues Software Upgrade over the network fails. Others Purple/green rolling horizontal bars and buzzing noise from the TV speakers with Component cable connection. Plasma TV is making humming noise. Solutions and Explanations •• Run Network Test in the Network menu to confirm the connection. •• If you have the latest Software (SW) version already installed, SW upgrade will not proceed. •• Remove the left and right audio connections from the set-top-box. If the buzzing stops, this indicates that the set-top-box has a grounding issue. Replace the Component video cables with an HDMI connection. •• Plasma TVs typically make a soft humming sound. This is normal. It's caused by the electrical charges that are used to create the images on ▶ the screen. •• If the humming sound is loud, you may have set the brightness on the TV too high. Try setting the brightness lower. •• You can also have loud humming if the back of your Plasma TV is too close to a wall or other hard surface. Also, try rerouting your connection cables. •• An improperly installed of wall mount can also create excessive noise. ▶ English