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3. Audio error
(1) No audio/Normal video
☞ A22 : Checking method in menu when there is no audio
☞ A23 : Voltage and speaker checking method when there is no audio
(2) Wrecked audio/discontinuation/Noise
☞A24 : Voltage and speaker checking method in case of audio error
4. Function error
(1) No response in remote controller, key error
☞ A25 : Remote controller operation checking method
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