The reason why the UV germicidal lamp cannot light up after being damaged may involve multiple aspects. The following is a detailed analysis of this issue:

First, Physical connection issues caused by damage

1. Loose or damaged lamp socket:

o When the UV germicidal lamp is damaged, the lamp socket may loosen due to impact or deformation, causing the lamp to be unable to be firmly inserted into the socket, resulting in no power supply.

o Damage to the socket itself may also cause the circuit to disconnect, making it impossible for the lamp to light up.

2. Lamp damage:

o The lamp tube is the core component of UV germicidal lamps. If the lamp tube is damaged, its internal filament may break or the internal structure of the lamp tube may be damaged, resulting in air leakage and causing the lamp tube to malfunction.

o Damaged light tubes may also cause issues such as electrical leakage or short circuits, further affecting the lighting of the light tubes.

Second, Electrical faults caused by damage

1. Damage to capacitors and transformers:

o The normal operation of UV germicidal lamps requires the support of capacitors and transformers. If the lamp tube is damaged and these components are damaged, it may affect the normal operation of the circuit, thereby making the lamp tube unable to light up.

2. Line malfunction:

o Damaged light tubes may cause problems such as broken circuits or poor contact, making it impossible for the circuit to form a path, resulting in the inability of the light tube to light up.

Third，Other possible reasons

1. Water ingress or moisture in the electrical control box:

o If the electrical control box is flooded or in a humid environment, it may cause a short circuit or damage to the circuit, thereby affecting the normal operation of the UV germicidal lamp.

2. Power switch damaged:

o The power switch is a key component for controlling the illumination of the UV germicidal  lamp. If the power switch is damaged, it may cause the lamp to fail to light up.

3.  Damaged fuse:

o The fuse plays a protective role in the circuit and will automatically disconnect the circuit when the current is too high. If the fuse is damaged, it may cause the circuit to malfunction, thereby affecting the illumination of the UV germicidal lamp.

In summary, the reason why the UV germicidal lamp cannot light up after being damaged may involve physical connection problems, electrical failures, and various other factors. Therefore, when repairing or replacing UV germicidal lamps, it is necessary to carefully inspect and eliminate these possible fault points. At the same time, in order to ensure the normal operation and safety of the UV germicidal lamp, it is recommended to regularly maintain and inspect it.