2022/08/29
Remote control troubleshooting solutions
Fault 1: All buttons on the remote control are unresponsive Analysis and Repair: The most common reason for all buttons on the remote control being unresponsive is a damaged crystal oscillator. If it has been dropped before or if there is no 'beep' sound when checked with a radio, you can directly replace it with a new crystal oscillator. If the fault persists after replacing the crystal oscillator, you should first measure the voltage at both ends of the crystal oscillator. When any button is pressed, there should be a noticeable voltage change at both ends of the crystal oscillator, indicating that the oscillator can generate pulse signals. Next, check if there is a relatively weak voltage change at the output end of the integrated circuit for the remote control signal. If there is a change, check whether the driving transistor and infrared emitter are damaged; otherwise, it is mostly due to a faulty integrated circuit.
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