Square sound open inside a lot of current sound causes:
Power filter capacitor damage or capacity reduction, resulting in equipment issued by a serious AC sound;
Signal input has poor contact, such as the signal line or poor contact between the plugs and sockets, resulting in a lot of noise;
Circuit boards have components welded, resulting in serious noise;
Audio input is followed by a signal line, but the signal line is not connected to the input source, this time the signal line is like an antenna. There will be noise interference, especially when the human body is close, the noise is greater.
Response to the above situation corresponding to the solution:
Check the equipment power supply filter capacitors, if the capacity failure or reduced in time according to the original model and capacity for replacement;
Check the signal input port, plug, socket, etc., if there is a false connection, replace or repair in a timely manner;
Circuit board false connections You can take a soldering iron to make up the welding, to ensure that the solder joints do not have a false connection;
Audio input source is no longer used, you need to remove the connecting wire, to avoid interference caused by the audio has noise.
Note: Plaza audio due to a long period of high-frequency transportation vibration can easily lead to internal circuitry welded, so it is best to use shock-absorbing foam on the front of the audio in the transportation, to reduce the chance of damage.