There is a red dot under the hotel projector.

Causes and solutions of general full-screen redness in projected images;

1, check whether the VGA cable is damaged, and try another one.

2. You can also check whether the lower voltage divider is closely connected with the VGA cable or whether the projector is closely connected with the VGA cable.

3, the light bulb burned out, need to replace a new light bulb to solve.

4. The cable connecting pc and projector has been used for a long time, and the contact is poor; You can tape the cable to the projector, and find this position yourself, or cut off the bad part of the cable and reconnect it.

Extended data:

Precautions for projector use:

1, pay attention to dust, moisture, corrosion and vibration. Nothing can be placed on the upper part of the projection box except the projector.

2. Don't move the projector during use, please wait until the filament cools before use.

3. Don't touch the optical components of the projector with your hands and hard objects. Please do not open the projector housing without authorization, there is electricity inside the projector.

4. In the process of using the projector, the air inlet and air outlet of the projector shall not be blocked.

5. In projection teaching, there should be shadows around the projection on the projection platform.

6. When using the projector, the opening angle of the reflector should be adjusted to make the projection optical axis perpendicular to the screen.

7. Generally speaking, try to use only the power switch, and don't turn on the brightness selection switch. If necessary, turn on the brightness selection switch after turning on the power switch 1-2 minutes.

8, be sure to pay attention to safety, don't pull the wires and pull the power plug.

9. When the power supply is not connected, you can wipe the surfaces of the projection cabinet and the projector cover platform with a soft cloth that is wrung out or dry-cleaned, and other parts are cleaned by professionals to prevent leakage accidents.