Repair Methods for Fuses -0805 Fuses
The fuse is broken, can you replace it yourself? There are two types of color TV fuses, severe and mild. Slight refers to a slightly blown fuse, usually replaced with a new one. Severe refers to the metal inside the fuse being burned to pieces or blackened out. If you replace it with a good fuse at this time, you will see the fuse light up as soon as you turn it on and immediately burn it out. As soon as the machine is turned on, the fuse will burn out. Therefore, the voltage measurement method with a universal meter cannot be used for maintenance, and only the resistance measurement method with a universal meter can be used for maintenance.
The cause of severe fuse burning is often due to a short circuit or variable value in one or at most two parts of the circuit. The faulty parts are in the circuit after the fuse, mostly in demagnetization circuits, 220 rectifier circuits, and switching tubes.
Based on the above knowledge of color TV fuses, the repair methods for color TV fuses are as follows:
1. First, vacuum the switch pins, solder out the demagnetization resistor, solder out the 300V filtering electrolysis, and then replace the fuse. When powered on, there will be two situations: if the fuse is no longer burned, it means that the faulty part is in the three disconnected parts mentioned above. You can add power one by one, and when adding it to a certain part, the fuse will burn, indicating that a certain part is faulty.
2. If you burn the fuse again, you can rule out the disconnection of those three parts. The fault is still in the parts of the machine. At this time, you can first remove the diode and then turn on the power. If the fuse is not burned, the fault is in the diode. If the fuse is burned, the fault is in the machine.
3. There are only a few remaining parts on the machine, so it will be much more convenient to check them again. Once the cause of the malfunction is identified, it can be easily repaired without burning a fuse.
Fig.1
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