Vertical, horizontal, or flickering colored stripes on the projector screen are common display faults that seriously affect viewing experience. These stripes vary in thickness and color, and the causes are divided into external signal interference, incorrect parameter settings, and internal hardware faults. Before carrying out professional maintenance, users can eliminate simple external faults first, which can solve more than half of the stripe problems. The most frequent cause is faulty signal transmission caused by damaged, aging, or loose connecting cables. HDMI, VGA, and AV cables that are bent excessively, worn out, or poorly contacted will lead to unstable signal transmission, resulting in regular stripes and screen flickering.

Signal interference and mismatched resolution parameters are also important inducements of screen stripes. When the projector is used near high-power electrical equipment such as air conditioners, refrigerators, and wireless routers, electromagnetic interference will occur, causing irregular floating stripes on the screen. Moving the projector and signal cables away from high-power electrical equipment and using shielded signal cables can effectively avoid electromagnetic interference. Meanwhile, if the resolution and refresh rate of the connected mobile phone, computer, and other signal sources do not match the projector’s native parameters, screen compression, distortion, and striped patterns will appear. Users can set the signal source resolution to be consistent with the projector’s recommended parameters and adjust the refresh rate to a stable standard value to eliminate such display anomalies.

If the above methods fail to remove the stripes, it indicates that there is an internal hardware failure of the projector. For DLP projectors, abnormal operation or dust accumulation on the internal color wheel will cause fixed color stripes; for LCD projectors, aging, damage, or dust pollution of the LCD panel will lead to permanent fixed stripes on the screen. In addition, the failure of the main control board and signal processing chip will also cause continuous stripe faults. At this time, it is not suitable for users to disassemble the machine by themselves. It is necessary to send the equipment to a professional maintenance institution for dust cleaning, accessory replacement, and circuit detection to completely solve the screen stripe problem.

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