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If the speaker is not normal, please replace it. On the other hand, if the connecting cable of ordinary lcd advertising machine speaker is not connected correctly, it is easy to fall off. If it falls, solder it. Loud noise from the speaker will damage the driving board of LCD advertising machine. Replace the drive board immediately.

1. If lcd advertising machine continues to work normally and this happens suddenly, the LCD screen of the advertising machine will fail. During the warranty period, it will be handled by finding a lcd advertising machine manufacturer to repair or charge for replacing a new LCD screen. Different manufacturers have different after-sales cost systems, so there is no standard.

2. If this happens in lcd advertising machine due to some special circumstances, it is necessary to deal with the problem of returning goods at any time according to the situation and the size of the equipment.

3. By checking the black screen problem, the signal operation of the plug-in board, the normal power supply of the power board, the indicator light or whether the motherboard works, the inspection can be evaluated.

4. Check whether the intelligent advertising machine is powered on and whether the wire falls off or is loose. If it is powered on, first check whether the LCD screen of the advertising machine is powered on, then check whether the driving board of the advertising machine is powered on, whether the high-voltage bar is powered on, and whether the LCD screen is powered on. All differences indicate that the parts are defective, and the advertising machine manufacturer is informed to replace the parts.