Samsung LN19D450G1DXZA - Manual (Page 179)

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English
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Troubleshooting
If the TV seems to have a problem, first review this list of problems and solutions.
If none of these troubleshooting tips apply, visit samsung.com, then click on
Support, or call Samsung customer service at 1-800-SAMSUNG.
Issues Solutions and Explanations
Poor picture First, perform the Picture Test and to see if your TV is
properly displaying the test image.
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Go to MENU - Support - Self Diagnosis - Picture Test
If the test image is properly displayed, the poor picture may
be caused by the source or signal.