Since the 2009 purchase of the home’s first projector, the Optoma HD70S, this projection has been a great time for me and my family, but it’s been a problem recently and it took ten minutes to boot. After that, there will be problems with the projected image flickering and the serious color cast of the screen. Since the warranty period has long passed, it is decided to handle it.
In Baidu's query, this kind of fault is usually caused by the malfunction of the color wheel sensor. Generally, it is due to the color wheel dirty and the reflective optocoupler aging of the sensor. If it is the former problem, you can use a clean color wheel. To solve, if it is the latter kind of problem, then we must replace the aging optocoupler to troubleshoot.
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Remove the projection from the wall
Optoma HD70S is an old 720P home projector with a rich interface that supports HDMI V1.3, color difference input, VGA input, and S-video input
Midea China Jiangsu
Prepared tools
Remove the lamp chamber cover at the bottom of the machine and remove the bulb
At this point you can see the interior of the lamp chamber
From a different angle, you can see the color wheel, you can clearly see a lot of dust on the color wheel
Unfortunately, it was impossible to remove the wheel assembly from the lamp house and had to prepare to open the lid.
Unscrew a few screws from the bottom of the fuselage and the lamp compartment cover, and three small screws on the side of the fuselage, and then prepare a few hard cards, open
For the HD70S, the cover of the ZOOM wheel must be lowered before opening the top cover, so that the top cover can be easily removed
Open the cover smoothly
Remove the upper cover by removing the connection between the cover and the main board.
At this point you can see the color wheel assembly
Remove the two connecting wires between the color wheel assembly and the main board, and remove the two fixing screws to remove the color wheel assembly.
Is it dirty enough? Oh, then remove the optocoupler on the assembly
From a different angle, you can see the thick dust on the color wheel. What you need to clean today is
Prepare cleaning supplies
Scrubbing brush, brush, and finally become like this
Return the optocoupler plate to the color wheel assembly, and replace the color wheel assembly to the machine
One by one to restore the connection
Put the cover back on the fuselage
Fix all fuselage screws, replace the bulb and lamp chamber cover, and reattach the DIY projection hanger
Return the projection to the projector hanger
Power on, everything is OK
Machine display is normal
Put a big block and then repeat
The color bars on the screen are shot by the mobile phone. It is actually not visible with the naked eye.
After tens of minutes of testing, the projection screen is normal, there is no previous flash color cast, and the cleaning is successful!
Rush a pot of Tieguanyin and watch a big movie.
The above pictures are taken by iphone6 ​​mobile phone. Because it is during the daytime, the interior light is bright, and no curtain is used, so the projection effect is limited, do not spray ~
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