1. The contact key switch does not work if it is pressed by hand for many times, or it can be used once in a while. This fault is that the contact switch is broken
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Need to replace the contact switch, the replacement is best to replace all of them, if only change this one, may be over a period of time may be broken, because the other also to the life. So replace them all with new ones
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2. The electrical appliance always jumps the key, such as the TV always reduces the volume after the TV is turned on, we adjust it to a large volume, and they reduce it again, and the screen of the TV can see the volume reduction screen, this problem is that the volume reduction key on the TV is short circuit inside, the contact switch can be changed, if there is no hand, you can also remove it. The TV can also be repaired.
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3. If all the keys on the appliance fail, many times the contact switch is broken, and if there is a leakage or short circuit in these keys, it will affect the use of other keys, so all the failures, the solution is to replace all the keys.
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4. When we press this function key on the electrical appliance, it jumps to other function keys by itself, and all the keys will jump to the fixed key by themselves, which proves that the key is also short circuit inside. All the keys were replaced during maintenance.
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This contact switch on all electrical equipment, after a long time is actually more bad, the above is my maintenance experience, to share with you!
1\/2 step reading
There are many reasons for the touch switch failure, it may be caused by poor contact, need to cut off the power, and then wipe the contact clean to repair; The circuit board may be burned out, and the circuit board needs to be replaced. It is recommended to contact professional personnel for operation. The switch may be stuck, you can disconnect the power supply, and then take off the switch panel to see if there is any foreign matter stuck.
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Equipment use precautions:
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1, touch the switch can not be used, may be the switch is not opened, can be checked.
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2, the touch switch needs screws to fix, remove the panel, save the screws, third-party screws may be incompatible with the device.
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3, different brands of touch switches have different wiring methods, need to pay attention to the purchase.
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4, touch switch chip is the core component, it is recommended to choose products produced by big brand manufacturers, quality assurance, sensitivity is relatively high.
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5, touch switch has different installation methods, can be selected according to the needs of use.
Home appliance touch control circuit principle is basically the same, touch failure, out of control, first clean and dry circuit board, check, replace the corresponding keys around the capacitor, diode, etc., these have no effect, and then consider replacing the chip