LG DM2350D Owner's Manual page 109

Image problem
❐
SETTINGS ➾ Customer Support ➙ Picture Test
Conducts Picture Test first to verify that image signal output is normal.
When the test image is normal, check connected external devices or broadcast
signal.
ꕢ Images from the previously viewed channel or other channels linger or the
screen shows annoying lines.
• Adjust the antenna to the direction of the TV station or refer to the manual for proper
way to connect the antenna.