Akai LMH27CJSA Operator's Manual page 46

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There is no picture. There is no picture from AV.
 Make sure the Contrast/Brightness is properly adjusted.
 Make sure all external devices are connected properly.
There is no sound.
 Make sure the volume is not set to minimum .
 Make sure the sound is not set to mute.
 Make sure that headphones are not connected.
There is no picture or sound, just noise.
 The reception may be weak.
 Make sure the aerial is not disconnected.
Picture is not clear.
 The reception may be weak.
 Make sure the aerial is not disconnected.
Picture is too light.
 Check colour adjustment.
 Check colour system setting.
The picture is too dark.
 Check if the APC button is set to "Dark".
 Check Contrast/Brightness adjustment.
Remote control does not work.
 Check the batteries in the remote control are not flat.
 Make sure the remote sensor window is not under strong lighting.
The picture is not sharp.
 The reception may be weak.
 Make sure the aerial is not disconnected.
The picture moves.
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