The high-voltage fire treatment method of a television is mainly caused by the following three causes:
1 There is more dust in the air. During operation of the television set, dust is adsorbed around the high voltage cap due to electrostatic induction caused by high voltage, which degrades its insulation performance;
2 The air humidity is high, the high-pressure cap is not tightly sealed, and the TV repair makes the high-pressure cap enter the humid air. 3 The high-voltage clip spring and the high-voltage line connect the solder joints with burrs. The burrs will cause the tip discharge phenomenon and burn the rubber of the high-pressure cap. Therefore, the high voltage fire on the TV is mainly caused by the damp weather.
Because the distance between the high-voltage mouthpiece of the color TV and the ground graphite layer of the casing of the picture tube is close, there are more than 20,000 volts of high voltage. After the TV has been used for a period of time, the dust in the machine is too high and the high voltage passes through the dust to form a high-pressure spark.
Second, the ignition area:
1, the fire can generally be in the high pressure cap.
2, line output transformer ignition
3, high-voltage line ignition
4, focusing very fire (that is, the seat of the fire)
Third, high pressure fire treatment methods:
First of all, we must distinguish the high pressure caused by the location of the fire, in order to prescribe the right medicine. High-pressure cap ignition treatment method: Before the high-pressure cap is removed, the high pressure nozzle of the picture tube must be discharged. When discharging, firstly prepare a sheathed insulated wire, two ends must have metal heads, and one head should be placed on the ground wire of the TV. Inserted into the high-pressure cap, you will hear a bang, the high pressure will be discharged, and it should be repeatedly discharged more than 3 times to ensure that the high pressure is completely clean.
After the discharge is completed, the high pressure cap is removed, and then the high pressure cap is cleaned with anhydrous alcohol, and the peripheral portion of the cathode of the picture tube must be scrubbed with alcohol several times to ensure that there is no dust. In particular, when the discharge is severe, it is necessary to drain the picture tube. After these parts are cleaned, they must be blown dry with a hair dryer. Then apply high-voltage grease to the high-voltage anode. When installing the high-pressure cap, be sure to squeeze out the internal air. This will prevent the TV high voltage cap from catching fire.
High-pressure cap disassembly method: When removing the high-pressure cap, do not cut the root, but use a blade to cut the high-pressure cap tail pipe. This avoids the shorter and longer the high voltage line. When installing a high-pressure cap, clean the high-voltage cord with alcohol (8-10 cm) and apply silicone grease to the head and then insert the high-pressure cap. This will avoid leakage from the tail pipe. The high-pressure nozzle shall be sanded with fine sandpaper (above No. 320), and the scratches caused by the fire must be carefully polished. Wash and dry with alcohol. Apply silicone grease around the high pressure nozzle, slightly smaller than the diameter of the high pressure cap. Install high pressure cap and compact.
The high-voltage line can be short, and the gap at the joint should be as small as possible. Take a long high-pressure cap tail pipe sleeve (to be coated with grease) and then wrap around three to four layers with plastic tape.
Reminder: The TV is an electrical appliance. It is best to “I have a housekeeper†to find a professional to perform maintenance to ensure safety!
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