Repair measures: After directly cutting off the 103 capacitor or replacing the display board, the air conditioner runs normally all the time. Experience summary: There are many reasons for not receiving remote signals. In addition to the leakage of the above-mentioned capacitors, phantom welding of components can also cause non-reception. In addition, the usage environment of the air conditioner has a great impact on the remote control reception. When the environmental humidity is high, condensation water forms between the soldering points on the back of the remote display board, causing the circuit board to mold and reducing its insulation performance. Leakage between the solder joints leads to the air conditioner not turning on via remote control or the remote control malfunctioning. After cleaning the circuit board (Beijing Changhong Air Conditioner Repair) and drying it with a hair dryer, apply a layer of glass glue on the back of the remote display board, allowing the remote to receive signals normally. Use the AM band of a radio to check if the remote control is emitting signals. If the air conditioner runs normally after manual startup, it can exclude faults in the main control board, thus confirming that the problem lies in the receiver. During repairs, one should not simply replace parts, especially when repeated repairs occur within a short period; the reason for part damage should be carefully analyzed.
Changhong Air Conditioner (Remote does not turn on): Remote Receiver Fault
Fault Phenomenon: Remote does not turn on
Source Article: http://blog.163.com/changhon_kongt
Cause Analysis: Check the remote control. Aim the remote at an ordinary radio and press any button. If the radio responds, this indicates the remote control is normal and the fault lies in the indoor unit's main control board or the remote receiver. Open the outer cover of the indoor unit and check the 220-volt input power supply as well as the 12-volt and 5-volt voltages, which are all normal. Manually start the air conditioner, and it starts and runs normally, indicating there is no problem with the main control board. The fault lies in the components of the remote receiver. Upon inspection, it was found that the ceramic capacitor (103Z/50V) in the controller receiving circuit has a low insulation resistance of only a few kΩ. A good ceramic capacitor should have an insulation resistance above 10000MΩ. The excessive leakage current caused by this prevents the remote from receiving signals.
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