There are several reasons why the bulb does not light up

The reason why the bulb does not light up: it may be that the lamp is damaged, the line is faulty, the switch control line has a broken point, and the switch is faulty. Burning out of the filament of the lamp will cause the lamp to not light up.

Solution: 1. First of all, it depends on the incandescent lamp or energy-saving lamp you use at home, if it is an incandescent lamp, it is caused by poor contact, if it is an energy-saving lamp, it may be caused by the unstable voltage in your home, mainly because the voltage is too low, or the contact of the line is poor, if it is not a normal power outage, the cause of the line should be found and dealt with.

2. Disassemble the bulb and eliminate the short-circuit factor; The switch can't really be closed, change it to a new one; The wire inside the plastic is broken, replace the wire.

3. You can swap the unlit lamp with the bright lamp to judge whether the filament is burned out.

4. Replace the bulb.

Summary. The light is not very bright, and it is usually caused by a decrease in voltage or poor contact. Because the bulb is fine.

What is the reason why the light is not too bright, there is no problem with the bulb.

The light is not very bright, and it is usually caused by a decrease in voltage or poor contact. Because the bulb is fine.

We need to prescribe the right medicine and repair according to the reason why the bulb does not light up and some faults. 1. Because there is a problem with the installation line, we need to confirm which section of the line has the problem and then deal with it. If you find it and find that the wire is damaged, you need to replace it with a new one and connect it again.

In addition, it is also necessary to check the joint of the switch to see if there is a wire blocked. 2. If it is a problem with the bulb, first disconnect the power supply, use a screwdriver to remove the lamp holder, and then send the power to detect the neutral line and the live wire. If it is normal, it means that the lampholder is broken, and replacing the lampholder with another one will solve the problem.

3. If it is a problem of voltage, you need to check the power supply voltage and adjust it to a fixed rated value, so that the bulb can be used normally.

I hope it helps, if there are no other questions, can you give a like, thank you very much.

The reasons why the small bulb does not light up are divided into internal and external reasons:

1.The circuit is not connected due to poor contact of the switch.

2.The main switch of the power supply is not closed, and there is no power to the line.

3.Poor line contact (loose wiring of the lamp port or oxidation of the air).

4.The circuit voltage does not meet the rated operating voltage of the bulb.

1.The filament is disconnected due to excessive vibration.

2.The lamp head lead is soldered.

3.There are debris in the lamp head or the relative height of the solder wire is not enough and the spring blade in the lamp mouth is not in good contact.

2.Observe that the bulb has broken wire, and the bulb should be replaced with a new one; If the filament breakage is not significant, you can use a digital multimeter to measure the filament resistance to determine, if the filament resistance value is infinite, the bulb should be replaced immediately.

3.Remove the light bulb, turn on the lamp head to check the wiring, if it falls down, it should be connected again.

4.If the lamp head is hung up, the bulb should be removed and the torsion spring contact point should be repaired to make it malleable.

or replace it with a new lamp head; If it is a spiral lamp head, after removing the bulb, trace the tip of the inner electric layer mouth in the middle outward to make the contact with the bulb more firm.

Although the technical countermeasures have been adopted to prevent tungsten from lifting at continuous high temperatures, in fact, tungsten can also be lifted at continuous high temperatures, and the solid immediately becomes gaseous. The hot tungsten vapor is cooled and then condensed into solid crystals that adhere to the inner surface of the lamp. As a result, the bulb will turn black and dark.

In addition, the effect of sublimation and condensation causes the filament to narrow, which is calculated by the formula r= (resistivity.

l s( r ) can be dissected to obtain, the semi-meridian r decreases, the filament resistance r increases, and the voltage on both sides of the lamp does not change, p=u r, so the output power of the lamp.

Zoom out, chroma.

Darkened. The resistance of an electrical conductor is related to the raw material, cross-section, length, and temperature of the electrical conductor. Generally, the resistance of metal materials expands with the increase of temperature, and tungsten filament also has the same properties.

At the contact of the switch, the poor contact of the line will also cause the circuit to be unconnected and the bulb will not light up. We need to check if there is a problem with this light, if the light is not on and the other lights are on, we need to check the lamp holder.

There are two reasons for the new bulb not to light up, there are internal reasons and external reasons, it may be caused by poor line contact or short circuit, or it may be caused by poor contact of the switch, or it is caused by the aging of the line, or there is a quality problem in the bulb itself, or it may be caused by the wrong installation method.

The bulb is broken, or there is a problem with the installation of the bulb, it may be caused by the fact that there is no power, check the power supply, check the installation.

I think it may be caused by the circuit, or it may be caused by quality, and it may also be caused by insufficient power, and it may also be caused by the lack of electricity bills, and it may even be caused by a short circuit.

1. Open circuit problem

For example, if the filament is broken, or the end of the wire is broken, the switch is open, etc., it will cause no current to pass through the appliance, so the lamp cannot shine normally.

2. Short circuit problem

In the socket of the wire, once the neutral wire and the live wire collide, it will cause a short circuit, and once a short circuit occurs, the fuse will soon occur.

Burn off, if it is serious, it will burn the electrical wiring and lead to a disaster.

3. Overload problem

Once the power of the common electrical appliances in the circuit is too large, it will cause the circuit to be unable to bear it, and eventually the fuse will burn out.

4. Circuit connection problems

If the two wires of the socket are on the same wire when we connect, it will cause the bulb to be in series state, and the bulb in series will not light up.

Maintenance of lamps.

When cleaning and maintaining, care should be taken not to change the structure of the lamp, and do not replace the parts of the lamp casually. After the cleaning and maintenance, the lamps should be installed as they are, and the lamps and lanterns should not be omitted or wrongly installed.

Try not to turn the light on and off frequently when using it. At the moment of frequent start-up of the lamp, the current through the filament is greater than the current during normal operation, which makes the temperature of the filament rise sharply and accelerate the sublimation, which will greatly reduce its service life, so it is necessary to minimize the switching of the lamp.

There are three main reasons why the bulb doesn't light up:1. The bulb does not light up.

There may be problems when installing the wire, which is a common reason. If the bulb connection is loose or the wire is oxidized, it can also cause the circuit to malfunction. 2.

At the switch contacts, poor line contact can also lead to circuit failure and lamp failure. We need to check if there is a problem with this lamp. If the light is not on and the other lights are on, we need to check the lampholder.

3.Voltage FailureIf the voltage is too low, the bulb may not light up at this time. 4.

When the bulb is not lit, the specific solution we need to fix some faults according to the reason why the bulb is not lit. 5.Because there is a problem with the installation line, we need to confirm which section of the line has the problem and then deal with it.

If the wire is found to be damaged, it must be replaced with a new one and reconnected. Also, check that there are no wires connected at the connector of the switch. 6.

If it is a bulb problem, disconnect the power supply first, remove the lamp head with a screwdriver, and then power on to detect the neutral and live wires. If everything is fine, the lampholder is damaged. A new lampholder solves this problem.

7.If it is a voltage problem, you need to check the power supply voltage and adjust it to a fixed rating before the bulb can be used normally.

The bulb has been used for a long time and is prone to problems, such as not lighting up. How do you fix the bulb when it doesn't turn on? PChouse will take you to find out.

1. Except for the bulb that does not light up, other electrical appliances are working normally, and generally we will think about whether the bulb is burned out. The bulb of ordinary round filament can be seen to be staggered or dropped by the filament inside, and the energy-saving lamp can generally be seen to be black at both ends, like this case, you have to buy a new bulb to replace. If you find that the bulb is no problem through the visual inspection, first disconnect the power supply, check whether the lamp holder is loose, before my hometown has a long fluorescent lamp, the lamp holder has a starter, sometimes the power is not on or a flash and off, generally through the starter reinstallation of the problem is solved.

2. The bulb is not lit, and the electrical branch is not working, the circuit may be quietly opened, you can use the electric tester to check whether the circuit has current through, of course, it may be a short circuit, first disconnect the electrical appliances and the switch with the first shout, remove the fuse of the live wire, and then find a 220V bulb to connect, turn on the switch, and find that the bulb is shining normally, you can judge that there is a short circuit, if the bulb is a little dark, the line is normal.

3. If the energized line fails, it is generally necessary to check whether the connection of the line is in good contact, and whether the wire is aging and broken. If the bulb does not light up, the leakage protector does not trip, the line should be open, disconnect the power supply, and use a multimeter to focus on checking the neutral line and the live wire. If the leakage protector trips, it is likely that there is a short circuit.

There can be many reasons why the bulb doesn't light up, here are some common reasons and how to fix them:

1.Burned-out bulb: This is the most common scenario, if the bulb burns out, you need to replace it with a new one.

2.Loose lamp base: Sometimes the connection of the lamp holder is not tight, and the bulb cannot shine normally. In this case, the lampholder needs to be re-tightened.

3.Loose power cord: If the power cord is loose or damaged, the current will not flow properly and the bulb will not shine properly. You need to check that the power cord is securely connected, and if it is damaged, the power cord needs to be replaced.

4.Circuit board failure: If the lamp bulb is normal after the above checks, then it may be caused by a circuit board failure. The luminaire needs to be disassembled, the circuit board is inspected for damage, and if it is damaged, the circuit board needs to be replaced.

Please note that when carrying out the above repairs, be sure to turn off the power and choose the appropriate repair tools and methods according to the specific situation. If you are unsure how to repair the beam, please seek professional help.