Samsung pn43d450a2d E-Manual page 105

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Signal
either perfect or the channels are unavailable. Adjust your antenna to increase
signal strength.
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Troubleshooting: If the TV seems to have a problem, refer to this description.
N
If none of these troubleshooting tips apply, contact the Samsung customer
service center.
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Information: (digital channels only) An HD channel's reception quality is
English
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