You are watching a video or playing a game on the projector screen, and suddenly you see white dots on the screen.
These white dots may be scattered around the image or in a group at the bottom or on the whole screen, ruining your viewing experience.
So, what are the main reasons that cause white dots to be visible on the screen, and to fix it let’s talk in detail?
Reasons That Causes White Dots On Screen
The two most prominent reasons cause the white dots on the screen are that the DMD chip has failed to produce a clear image.
Another is a projector bulb that has not been cleaned for a while, and there is a build-up of dirt and dust on the lens.
Why does my projector have white dots
The most prominent reason why the projector produces black or white dots is due to DMD chip failure, and it can be fixed by either repairing the DMD chip or replacing it with a new one.
DMD Chip Failure
In this case, if your projector is older and it supports a DMD chip, then probably the DMD has stopped functioning properly and fails to deliver the images on the screen.
Now a DMD chip produces a dead image on the screen, which are completely pixelated, and even you cannot access the menu option due to white dots.
So, if one mirror fails to work properly, it will cause a “black dot” or “white dot” on the projected image.
Sometimes, these failing pixels can be repaired by resetting the DMD chip. However, if the chip is damaged, you must replace it with a new one.
But remember, these white dots will be visible if your background has a black screen or wall. Similarly, if your background is white, you will see a black dot on the surface.
Why DMD Chip Gets Dead
The most prominent reason the chip gets dead pixels on a screen is due to weather conditions or too much heat in the environment where the projector is placed.
DMD chip is damaged due to heat and dust collected on the air vents failing to deliver the picture on the screen.
Also, the white dots will slowly cover the entire screen as the chip starts to fail. Only one step will remove the issue by replacing it with a new one.
Solution To Fix White Dots On Screen
To Fix the white dots, you need to follow the process below. The process is the same as when the CPU processor fails, replacing it with a new one. The same process goes with the projector’s DLP chip.
Cooling the projector
When I used to fix the DMD chip failure, letting the projector cool down was unnecessary because who would use a dead projector?
But still, you can cool the unit if you are still using the dead projector by removing the main power source and letting it cool for at least half an hour.
Unscrew the case
Now it’s time to open up your projector by removing all the screws at the back and bottom of the projector.
Place all the screws in the same place because people often forget or misplace the screw, which consumes lots of time to find them again.
Clean the motherboard
It is obvious you are opening the projector for the first time, and there will be a lot of dust. So take a brush and clean the motherboard.
Also, you can clean other parts but ensure you don’t do it roughly.
After cleaning, it’s time to remove all the parts and wires connected to the main board where the DMD chip is placed.
But before removing anything, first, take a picture or note down the connection so that you can fix everything back in its place.
You can also call for a helping hand and tell him to do a video recording while you are doing the process, so if you make any mistake, you can see that video and fix it.
Replacing DMD Chip With New One
After doing all the above steps, it’s time to replace the faulty DMD chip with a new one. Remember this step requires some technical knowledge.
- First, remove anything attached to the chip, like wires, heat sink, or anything else.
- You need a suction cup to remove the old DMD chip from the board. The suction cup is usually in the form of a small black rubber used to open up mobile phones.
- After removing the heat sink, carefully remove the DMD chip with a suction cup.
- Now remove the old thermal paste applied between the heat sink and chip. You can use a dry cloth to remove the old paste from the heat sink.
- Cleaning the paste is essential because if you apply new paste on top of the old one, it will not work correctly, and your projector will overheat.
- Take the new chip, apply a new thermal paste and place it back in its same socket.
Now check if the issue is resolved. If not, there might be some other problem, and your lamp has probably been covered with dust particles.
Solution On Removing Dust Particles On Projector Lamp?
- This time you should wait for half an hour to cool the projector if you have checked the projector after replacing the old DMD chip with a new one.
- Unscrew again projector body from the backside and remove the body carefully.
- Don’t touch the board. Unscrew the lamp and take it out carefully.
- Now take a clean white cloth and wipe it without touching the lamp’s glass.
- Also, you can use a blower to blow off the dust particles from the projector lamp.
- After cleaning, place the lamp back in its place and screw everything again.
- Now turn on your projector, and you will see no more white dots on the screen.
If you followed all the steps correctly, your projector should work fine without any white dots.
But still, if you see any dots, there might be a problem with other parts like the heat sink, which is not working properly, then it’s time to take the projection with a technical person.
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