Can't talk about the intercom?

In the case of ensuring that the battery is electric and the battery contact is normal, if the intercom cannot be turned on, the first thing to do is to check whether the insurance tube (F500) is burned out due to the large current. If the insurance tube is normal, the intercom cannot be turned on, and it may be caused by poor contact with the mainboard socket with the soft circuit plug. At this time, you need to replace the soft circuit plug or the motherboard socket.