Samsung LN19D450G1DXZA - Manual (Page 122)

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Signal Information : (digital channels only) The reception quality of over-
the-air HD channels is either perfect or the channels are unavailable. Signal
Information displays HD channel signal strength so you can adjust your
antenna to increase signal strength and receive HD channels.
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Troubleshooting : Displays a troubleshooting guide organized into four
symptom categories: Poor or Distorted Picture, Distorted Sound or No
Sound, RF or PC Issues, and Other Issues. If your TV seems to be having a
problem, access the trouble shooting guide for a solution.
N If none of these troubleshooting tips apply, contact the Samsung
customer service center.